mirror of https://github.com/Icinga/icinga2.git
1095 lines
43 KiB
Markdown
1095 lines
43 KiB
Markdown
# Icinga 2 Troubleshooting <a id="troubleshooting"></a>
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## Required Information <a id="troubleshooting-information-required"></a>
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Please ensure to provide any detail which may help reproduce and understand your issue.
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Whether you ask on the community channels or you create an issue at [GitHub](https://github.com/Icinga), make sure
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that others can follow your explanations. If necessary, draw a picture and attach it for
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better illustration. This is especially helpful if you are troubleshooting a distributed
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setup.
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We've come around many community questions and compiled this list. Add your own
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findings and details please.
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* Describe the expected behavior in your own words.
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* Describe the actual behavior in one or two sentences.
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* Ensure to provide general information such as:
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* How was Icinga 2 installed (and which repository in case) and which distribution are you using
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* `icinga2 --version`
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* `icinga2 feature list`
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* `icinga2 daemon -C`
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* [Icinga Web 2](https://icinga.com/products/icinga-web-2/) version (screenshot from System - About)
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* [Icinga Web 2 modules](https://icinga.com/products/icinga-web-2-modules/) e.g. the Icinga Director (optional)
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* Configuration insights:
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* Provide complete configuration snippets explaining your problem in detail
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* Your [icinga2.conf](04-configuring-icinga-2.md#icinga2-conf) file
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* If you run multiple Icinga 2 instances, the [zones.conf](04-configuring-icinga-2.md#zones-conf) file (or `icinga2 object list --type Endpoint` and `icinga2 object list --type Zone`) from all affected nodes.
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* Logs
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* Relevant output from your main and [debug log](15-troubleshooting.md#troubleshooting-enable-debug-output) in `/var/log/icinga2`. Please add step-by-step explanations with timestamps if required.
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* The newest Icinga 2 crash log if relevant, located in `/var/log/icinga2/crash`
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* Additional details
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* If the check command failed, what's the output of your manual plugin tests?
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* In case of [debugging](21-development.md#development) Icinga 2, the full back traces and outputs
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## Analyze your Environment <a id="troubleshooting-analyze-environment"></a>
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There are many components involved on a server running Icinga 2. When you
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analyze a problem, keep in mind that basic system administration knowledge
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is also key to identify bottlenecks and issues.
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> **Tip**
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>
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> [Monitor Icinga 2](08-advanced-topics.md#monitoring-icinga) and use the hints for further analysis.
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* Analyze the system's performance and dentify bottlenecks and issues.
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* Collect details about all applications (e.g. Icinga 2, MySQL, Apache, Graphite, Elastic, etc.).
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* If data is exchanged via network (e.g. central MySQL cluster) ensure to monitor the bandwidth capabilities too.
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* Add graphs and screenshots to your issue description
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Install tools which help you to do so. Opinions differ, let us know if you have any additions here!
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### Analyse your Linux/Unix Environment <a id="troubleshooting-analyze-environment-linux"></a>
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[htop](https://hisham.hm/htop/) is a better replacement for `top` and helps to analyze processes
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interactively.
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```
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yum install htop
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apt-get install htop
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```
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If you are for example experiencing performance issues, open `htop` and take a screenshot.
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Add it to your question and/or bug report.
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Analyse disk I/O performance in Grafana, take a screenshot and obfuscate any sensitive details.
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Attach it when posting a question to the community channels.
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The [sysstat](https://github.com/sysstat/sysstat) package provides a number of tools to
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analyze the performance on Linux. On FreeBSD you could use `systat` for example.
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```
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yum install sysstat
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apt-get install sysstat
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```
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Example for `vmstat` (summary of memory, processes, etc.):
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```
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// summary
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vmstat -s
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// print timestamps, format in MB, stats every 1 second, 5 times
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vmstat -t -S M 1 5
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```
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Example for `iostat`:
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```
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watch -n 1 iostat
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```
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Example for `sar`:
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```
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sar //cpu
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sar -r //ram
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sar -q //load avg
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sar -b //I/O
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```
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`sysstat` also provides the `iostat` binary. On FreeBSD you could use `systat` for example.
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If you are missing checks and metrics found in your analysis, add them to your monitoring!
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### Analyze your Windows Environment <a id="troubleshooting-analyze-environment-windows"></a>
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A good tip for Windows are the tools found inside the [Sysinternals Suite](https://technet.microsoft.com/en-us/sysinternals/bb842062.aspx).
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You can also start `perfmon` and analyze specific performance counters.
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Keep notes which could be important for your monitoring, and add service
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checks later on.
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## Enable Debug Output <a id="troubleshooting-enable-debug-output"></a>
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### Enable Debug Output on Linux/Unix <a id="troubleshooting-enable-debug-output-linux"></a>
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Enable the `debuglog` feature:
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```
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# icinga2 feature enable debuglog
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# service icinga2 restart
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```
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The debug log file can be found in `/var/log/icinga2/debug.log`.
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Alternatively you may run Icinga 2 in the foreground with debugging enabled. Specify the console
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log severity as an additional parameter argument to `-x`.
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```
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# /usr/sbin/icinga2 daemon -x notice
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```
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The [log severity](09-object-types.md#objecttype-filelogger) can be one of `critical`, `warning`, `information`, `notice`
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and `debug`.
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### Enable Debug Output on Windows <a id="troubleshooting-enable-debug-output-windows"></a>
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Open a command prompt with administrative privileges and enable the debug log feature.
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```
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C:> icinga2.exe feature enable debuglog
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```
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Ensure that the Icinga 2 service already writes the main log into `C:\ProgramData\icinga2\var\log\icinga2`.
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Restart the Icinga 2 service and open the newly created `debug.log` file.
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```
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C:> net stop icinga2
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C:> net start icinga2
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```
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## Configuration Troubleshooting <a id="troubleshooting-configuration"></a>
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### List Configuration Objects <a id="troubleshooting-list-configuration-objects"></a>
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The `icinga2 object list` CLI command can be used to list all configuration objects and their
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attributes. The tool also shows where each of the attributes was modified.
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> **Tip**
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>
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> Use the Icinga 2 API to access [config objects at runtime](12-icinga2-api.md#icinga2-api-config-objects) directly.
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That way you can also identify which objects have been created from your [apply rules](17-language-reference.md#apply).
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```
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# icinga2 object list
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Object 'localhost!ssh' of type 'Service':
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* __name = 'localhost!ssh'
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* check_command = 'ssh'
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% = modified in '/etc/icinga2/conf.d/hosts/localhost/ssh.conf', lines 5:3-5:23
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* check_interval = 60
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% = modified in '/etc/icinga2/conf.d/templates.conf', lines 24:3-24:21
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* host_name = 'localhost'
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% = modified in '/etc/icinga2/conf.d/hosts/localhost/ssh.conf', lines 4:3-4:25
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* max_check_attempts = 3
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% = modified in '/etc/icinga2/conf.d/templates.conf', lines 23:3-23:24
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* name = 'ssh'
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* retry_interval = 30
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% = modified in '/etc/icinga2/conf.d/templates.conf', lines 25:3-25:22
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* templates = [ 'ssh', 'generic-service' ]
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% += modified in '/etc/icinga2/conf.d/hosts/localhost/ssh.conf', lines 1:0-7:1
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% += modified in '/etc/icinga2/conf.d/templates.conf', lines 22:1-26:1
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* type = 'Service'
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* vars
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% += modified in '/etc/icinga2/conf.d/hosts/localhost/ssh.conf', lines 6:3-6:19
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* sla = '24x7'
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% = modified in '/etc/icinga2/conf.d/hosts/localhost/ssh.conf', lines 6:3-6:19
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[...]
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```
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You can also filter by name and type:
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```
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# icinga2 object list --name *ssh* --type Service
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Object 'localhost!ssh' of type 'Service':
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* __name = 'localhost!ssh'
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* check_command = 'ssh'
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% = modified in '/etc/icinga2/conf.d/hosts/localhost/ssh.conf', lines 5:3-5:23
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* check_interval = 60
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% = modified in '/etc/icinga2/conf.d/templates.conf', lines 24:3-24:21
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* host_name = 'localhost'
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% = modified in '/etc/icinga2/conf.d/hosts/localhost/ssh.conf', lines 4:3-4:25
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* max_check_attempts = 3
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% = modified in '/etc/icinga2/conf.d/templates.conf', lines 23:3-23:24
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* name = 'ssh'
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* retry_interval = 30
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% = modified in '/etc/icinga2/conf.d/templates.conf', lines 25:3-25:22
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* templates = [ 'ssh', 'generic-service' ]
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% += modified in '/etc/icinga2/conf.d/hosts/localhost/ssh.conf', lines 1:0-7:1
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% += modified in '/etc/icinga2/conf.d/templates.conf', lines 22:1-26:1
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* type = 'Service'
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* vars
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% += modified in '/etc/icinga2/conf.d/hosts/localhost/ssh.conf', lines 6:3-6:19
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* sla = '24x7'
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% = modified in '/etc/icinga2/conf.d/hosts/localhost/ssh.conf', lines 6:3-6:19
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Found 1 Service objects.
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[2014-10-15 14:27:19 +0200] information/cli: Parsed 175 objects.
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```
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Runtime modifications via the [REST API](12-icinga2-api.md#icinga2-api-config-objects)
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are not immediately updated. Furthermore there is a known issue with
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[group assign expressions](17-language-reference.md#group-assign) which are not reflected in the host object output.
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You need to restart Icinga 2 in order to update the `icinga2.debug` cache file.
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### Apply rules do not match <a id="apply-rules-do-not-match"></a>
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You can analyze apply rules and matching objects by using the [script debugger](20-script-debugger.md#script-debugger).
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### Where are the check command definitions? <a id="check-command-definitions"></a>
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Icinga 2 features a number of built-in [check command definitions](10-icinga-template-library.md#icinga-template-library) which are
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included with
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```
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include <itl>
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include <plugins>
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```
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in the [icinga2.conf](04-configuring-icinga-2.md#icinga2-conf) configuration file. These files are not considered
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configuration files and will be overridden on upgrade, so please send modifications as proposed patches upstream.
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The default include path is set to `/usr/share/icinga2/includes` with the constant `IncludeConfDir`.
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You should add your own command definitions to a new file in `conf.d/` called `commands.conf`
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or similar.
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### Configuration is ignored <a id="configuration-ignored"></a>
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* Make sure that the line(s) are not [commented out](17-language-reference.md#comments) (starting with `//` or `#`, or
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encapsulated by `/* ... */`).
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* Is the configuration file included in [icinga2.conf](04-configuring-icinga-2.md#icinga2-conf)?
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Run the [configuration validation](11-cli-commands.md#config-validation) and add `notice` as log severity.
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Search for the file which should be included i.e. using the `grep` CLI command.
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```
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# icinga2 daemon -C -x notice | grep command
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```
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### Configuration attributes are inherited from <a id="configuration-attribute-inheritance"></a>
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Icinga 2 allows you to import templates using the [import](17-language-reference.md#template-imports) keyword. If these templates
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contain additional attributes, your objects will automatically inherit them. You can override
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or modify these attributes in the current object.
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The [object list](15-troubleshooting.md#troubleshooting-list-configuration-objects) CLI command allows you to verify the attribute origin.
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### Configuration Value with Single Dollar Sign <a id="configuration-value-dollar-sign"></a>
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In case your configuration validation fails with a missing closing dollar sign error message, you
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did not properly escape the single dollar sign preventing its usage as [runtime macro](03-monitoring-basics.md#runtime-macros).
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```
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critical/config: Error: Validation failed for Object 'ping4' (Type: 'Service') at /etc/icinga2/zones.d/global-templates/windows.conf:24: Closing $ not found in macro format string 'top-syntax=${list}'.
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```
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Correct the custom attribute value to
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```
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"top-syntax=$${list}"
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```
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## Checks Troubleshooting <a id="troubleshooting-checks"></a>
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### Executed Command for Checks <a id="checks-executed-command"></a>
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* Use the Icinga 2 API to [query](12-icinga2-api.md#icinga2-api-config-objects-query) host/service objects
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for their check result containing the executed shell command.
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* Use the Icinga 2 [console cli command](11-cli-commands.md#cli-command-console)
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to fetch the checkable object, its check result and the executed shell command.
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* Alternatively enable the [debug log](15-troubleshooting.md#troubleshooting-enable-debug-output) and look for the executed command.
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Example for a service object query using a [regex match](18-library-reference.md#global-functions-regex)
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on the name:
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```
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$ curl -k -s -u root:icinga -H 'Accept: application/json' -H 'X-HTTP-Method-Override: GET' -X POST 'https://localhost:5665/v1/objects/services' \
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-d '{ "filter": "regex(pattern, service.name)", "filter_vars": { "pattern": "^http" }, "attrs": [ "__name", "last_check_result" ], "pretty": true }'
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{
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"results": [
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{
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"attrs": {
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"__name": "example.localdomain!http",
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"last_check_result": {
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"active": true,
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"check_source": "example.localdomain",
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"command": [
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"/usr/local/sbin/check_http",
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"-I",
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"127.0.0.1",
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"-u",
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"/"
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],
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...
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}
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},
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"joins": {},
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"meta": {},
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"name": "example.localdomain!http",
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"type": "Service"
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}
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]
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}
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```
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Example for using the `icinga2 console` CLI command evaluation functionality:
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```
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$ ICINGA2_API_PASSWORD=icinga icinga2 console --connect 'https://root@localhost:5665/' \
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--eval 'get_service("example.localdomain", "http").last_check_result.command' | python -m json.tool
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[
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"/usr/local/sbin/check_http",
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"-I",
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"127.0.0.1",
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"-u",
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"/"
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]
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```
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Example for searching the debug log:
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```
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# icinga2 feature enable debuglog
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# systemctl restart icinga2
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# tail -f /var/log/icinga2/debug.log | grep "notice/Process"
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```
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### Checks are not executed <a id="checks-not-executed"></a>
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* Check the [debug log](15-troubleshooting.md#troubleshooting-enable-debug-output) to see if the check command gets executed.
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* Verify that failed depedencies do not prevent command execution.
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* Make sure that the plugin is executable by the Icinga 2 user (run a manual test).
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* Make sure the [checker](11-cli-commands.md#enable-features) feature is enabled.
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* Use the Icinga 2 API [event streams](12-icinga2-api.md#icinga2-api-event-streams) to receive live check result streams.
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Examples:
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```
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# sudo -u icinga /usr/lib/nagios/plugins/check_ping -4 -H 127.0.0.1 -c 5000,100% -w 3000,80%
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# icinga2 feature enable checker
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The feature 'checker' is already enabled.
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```
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Fetch all check result events matching the `event.service` name `random`:
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```
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$ curl -k -s -u root:icinga -H 'Accept: application/json' -X POST 'https://localhost:5665/v1/events?queue=debugchecks&types=CheckResult&filter=match%28%22random*%22,event.service%29'
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```
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### Analyze Check Source <a id="checks-check-source"></a>
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Sometimes checks are not executed on the remote host, but on the master and so on.
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This could lead into unwanted results or NOT-OK states.
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The `check_source` attribute is the best indication where a check command
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was actually executed. This could be a satellite with synced configuration
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or a client as remote command bridge -- both will return the check source
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as where the plugin is called.
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Example for retrieving the check source from all `disk` services using a
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[regex match](18-library-reference.md#global-functions-regex) on the name:
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```
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$ curl -k -s -u root:icinga -H 'Accept: application/json' -H 'X-HTTP-Method-Override: GET' -X POST 'https://localhost:5665/v1/objects/services' \
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-d '{ "filter": "regex(pattern, service.name)", "filter_vars": { "pattern": "^disk" }, "attrs": [ "__name", "last_check_result" ], "pretty": true }'
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{
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"results": [
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{
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"attrs": {
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"__name": "icinga2-client1.localdomain!disk",
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"last_check_result": {
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"active": true,
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"check_source": "icinga2-client1.localdomain",
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...
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}
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},
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"joins": {},
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"meta": {},
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"name": "icinga2-client1.localdomain!disk",
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"type": "Service"
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}
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]
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}
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```
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Example for using the `icinga2 console` CLI command evaluation functionality:
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```
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$ ICINGA2_API_PASSWORD=icinga icinga2 console --connect 'https://root@localhost:5665/' \
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--eval 'get_service("icinga2-client1.localdomain", "disk").last_check_result.check_source' | python -m json.tool
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"icinga2-client1.localdomain"
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```
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### NSClient++ Check Errors with nscp-local <a id="nsclient-check-errors-nscp-local"></a>
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The [nscp-local](10-icinga-template-library.md#nscp-check-local) CheckCommand object definitions call the local `nscp.exe` command.
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If a Windows client service check fails to find the `nscp.exe` command, the log output would look like this:
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```
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Command ".\nscp.exe" "client" "-a" "drive=d" "-a" "show-all" "-b" "-q" "check_drivesize" failed to execute: 2, "The system cannot find the file specified."
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```
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or
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```
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Command ".
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scp.exe" "client" "-a" "drive=d" "-a" "show-all" "-b" "-q" "check_drivesize" failed to execute: 2, "The system cannot find the file specified."
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```
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The above actually prints `.\\nscp.exe` where the escaped `\n` character gets interpreted as new line.
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Both errors lead to the assumption that the `NscpPath` constant is empty or set to a `.` character.
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This could mean the following:
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* The command is **not executed on the Windows client**. Check the [check_source](15-troubleshooting.md#checks-check-source) attribute from the check result.
|
|
* You are using an outdated NSClient++ version (0.3.x or 0.4.x) which is not compatible with Icinga 2.
|
|
* You are using a custom NSClient++ installer which does not register the correct GUID for NSClient++
|
|
|
|
More troubleshooting:
|
|
|
|
Retrieve the `NscpPath` constant on your Windows client:
|
|
|
|
```
|
|
C:\Program Files\ICINGA2\sbin\icinga2.exe variable get NscpPath
|
|
```
|
|
|
|
If the variable is returned empty, manually test how Icinga 2 would resolve
|
|
its path (this can be found inside the ITL):
|
|
|
|
```
|
|
C:\Program Files\ICINGA2\sbin\icinga2.exe console --eval "dirname(msi_get_component_path(\"{5C45463A-4AE9-4325-96DB-6E239C034F93}\"))"
|
|
```
|
|
|
|
If this command does not return anything, NSClient++ is not properly installed.
|
|
Verify that inside the `Programs and Features` (`appwiz.cpl`) control panel.
|
|
|
|
You can run the bundled NSClient++ installer from the Icinga 2 Windows package.
|
|
The msi package is located in `C:\Program Files\ICINGA2\sbin`.
|
|
|
|
The bundled NSClient++ version has properly been tested with Icinga 2. Keep that
|
|
in mind when using a different package.
|
|
|
|
|
|
### Check Thresholds Not Applied <a id="check-thresholds-not-applied"></a>
|
|
|
|
This could happen with [clients as command endpoint execution](06-distributed-monitoring.md#distributed-monitoring-top-down-command-endpoint).
|
|
|
|
If you have for example a client host `icinga2-client1.localdomain`
|
|
and a service `disk` check defined on the master, the warning and
|
|
critical thresholds are sometimes to applied and unwanted notification
|
|
alerts are raised.
|
|
|
|
This happens because the client itself includes a host object with
|
|
its `NodeName` and a basic set of checks in the [conf.d](04-configuring-icinga-2.md#conf-d)
|
|
directory, i.e. `disk` with the default thresholds.
|
|
|
|
Clients which have the `checker` feature enabled will attempt
|
|
to execute checks for local services and send their results
|
|
back to the master.
|
|
|
|
If you now have the same host and service objects on the
|
|
master you will receive wrong check results from the client.
|
|
|
|
Solution:
|
|
|
|
* Disable the `checker` feature on clients: `icinga2 feature disable checker`.
|
|
* Remove the inclusion of [conf.d](04-configuring-icinga-2.md#conf-d) as suggested in the [client setup docs](06-distributed-monitoring.md#distributed-monitoring-top-down-command-endpoint).
|
|
|
|
### Check Fork Errors <a id="check-fork-errors"></a>
|
|
|
|
Newer versions of systemd on Linux limit spawned processes for
|
|
services.
|
|
|
|
* v227 introduces the `TasksMax` setting to units which allows to specify the spawned process limit.
|
|
* v228 adds `DefaultTasksMax` in the global `systemd-system.conf` with a default setting of 512 processes.
|
|
* v231 changes the default value to 15%
|
|
|
|
This can cause problems with Icinga 2 in large environments with many
|
|
commands executed in parallel starting with systemd v228. Some distributions
|
|
also may have changed the defaults.
|
|
|
|
The error message could look like this:
|
|
|
|
```
|
|
2017-01-12T11:55:40.742685+01:00 icinga2-master1 kernel: [65567.582895] cgroup: fork rejected by pids controller in /system.slice/icinga2.service
|
|
```
|
|
|
|
In order to solve the problem, increase the value for `DefaultTasksMax`
|
|
or set it to `infinity`.
|
|
|
|
```
|
|
mkdir /etc/systemd/system/icinga2.service.d
|
|
cat >/etc/systemd/system/icinga2.service.d/limits.conf <<EOF
|
|
[Service]
|
|
DefaultTasksMax=infinity
|
|
EOF
|
|
|
|
systemctl daemon-reload
|
|
systemctl restart icinga2
|
|
```
|
|
|
|
An example is available inside the GitHub repository in [etc/initsystem](https://github.com/Icinga/icinga2/tree/master/etc/initsystem).
|
|
|
|
External Resources:
|
|
|
|
* [Fork limit for cgroups](https://lwn.net/Articles/663873/)
|
|
* [systemd changelog](https://github.com/systemd/systemd/blob/master/NEWS)
|
|
* [Icinga 2 upstream issue](https://github.com/Icinga/icinga2/issues/5611)
|
|
* [systemd upstream discussion](https://github.com/systemd/systemd/issues/3211)
|
|
|
|
### Systemd Watchdog <a id="check-systemd-watchdog"></a>
|
|
|
|
Usually Icinga 2 is a mission critical part of infrastructure and should be
|
|
online at all times. In case of a recoverable crash (e.g. OOM) you may want to
|
|
restart Icinga 2 automatically. With systemd it is as easy as overriding some
|
|
settings of the Icinga 2 systemd service by creating
|
|
`/etc/systemd/system/icinga2.service.d/override.conf` with the following
|
|
content:
|
|
|
|
```
|
|
[Service]
|
|
Restart=always
|
|
RestartSec=1
|
|
StartLimitInterval=10
|
|
StartLimitBurst=3
|
|
```
|
|
|
|
Using the watchdog can also help with monitoring Icinga 2, to activate and use it add the following to the override:
|
|
|
|
```
|
|
WatchdogSec=30s
|
|
```
|
|
|
|
This way systemd will kill Icinga 2 if does not notify for over 30 seconds, a timout of less than 10 seconds is not
|
|
recommended. When the watchdog is activated, `Restart=` can be set to `watchdog` to restart Icinga 2 in the case of a
|
|
watchdog timeout.
|
|
|
|
Run `systemctl daemon-reload && systemctl restart icinga2` to apply the changes.
|
|
Now systemd will always try to restart Icinga 2 (except if you run
|
|
`systemctl stop icinga2`). After three failures in ten seconds it will stop
|
|
trying because you probably have a problem that requires manual intervention.
|
|
|
|
### Late Check Results <a id="late-check-results"></a>
|
|
|
|
[Icinga Web 2](https://icinga.com/products/icinga-web-2/) provides
|
|
a dashboard overview for `overdue checks`.
|
|
|
|
The REST API provides the [status](12-icinga2-api.md#icinga2-api-status) URL endpoint with some generic metrics
|
|
on Icinga and its features.
|
|
|
|
```
|
|
# curl -k -s -u root:icinga 'https://localhost:5665/v1/status?pretty=1' | less
|
|
```
|
|
|
|
You can also calculate late check results via the REST API:
|
|
|
|
* Fetch the `last_check` timestamp from each object
|
|
* Compare the timestamp with the current time and add `check_interval` multiple times (change it to see which results are really late, like five times check_interval)
|
|
|
|
You can use the [icinga2 console](11-cli-commands.md#cli-command-console) to connect to the instance, fetch all data
|
|
and calculate the differences. More infos can be found in [this blogpost](https://icinga.com/2016/08/11/analyse-icinga-2-problems-using-the-console-api/).
|
|
|
|
```
|
|
# ICINGA2_API_USERNAME=root ICINGA2_API_PASSWORD=icinga icinga2 console --connect 'https://localhost:5665/'
|
|
|
|
<1> => var res = []; for (s in get_objects(Service).filter(s => s.last_check < get_time() - 2 * s.check_interval)) { res.add([s.__name, DateTime(s.last_check).to_string()]) }; res
|
|
|
|
[ [ "10807-host!10807-service", "2016-06-10 15:54:55 +0200" ], [ "mbmif.int.netways.de!disk /", "2016-01-26 16:32:29 +0100" ] ]
|
|
```
|
|
|
|
Or if you are just interested in numbers, call [len](18-library-reference.md#array-len) on the result array `res`:
|
|
|
|
```
|
|
<2> => var res = []; for (s in get_objects(Service).filter(s => s.last_check < get_time() - 2 * s.check_interval)) { res.add([s.__name, DateTime(s.last_check).to_string()]) }; res.len()
|
|
|
|
2.000000
|
|
```
|
|
|
|
If you need to analyze that problem multiple times, just add the current formatted timestamp
|
|
and repeat the commands.
|
|
|
|
```
|
|
<23> => DateTime(get_time()).to_string()
|
|
|
|
"2017-04-04 16:09:39 +0200"
|
|
|
|
<24> => var res = []; for (s in get_objects(Service).filter(s => s.last_check < get_time() - 2 * s.check_interval)) { res.add([s.__name, DateTime(s.last_check).to_string()]) }; res.len()
|
|
|
|
8287.000000
|
|
```
|
|
|
|
More details about the Icinga 2 DSL and its possibilities can be
|
|
found in the [language](17-language-reference.md#language-reference) and [library](18-library-reference.md#library-reference) reference chapters.
|
|
|
|
### Late Check Results in Distributed Environments <a id="late-check-results-distributed"></a>
|
|
|
|
When it comes to a distributed HA setup, each node is responsible for a load-balanced amount of checks.
|
|
Host and Service objects provide the attribute `paused`. If this is set to `false`, the current node
|
|
actively attempts to schedule and execute checks. Otherwise the node does not feel responsible.
|
|
|
|
```
|
|
<3> => var res = {}; for (s in get_objects(Service).filter(s => s.last_check < get_time() - 2 * s.check_interval)) { res[s.paused] += 1 }; res
|
|
{
|
|
@false = 2.000000
|
|
@true = 1.000000
|
|
}
|
|
```
|
|
|
|
You may ask why this analysis is important? Fair enough - if the numbers are not inverted in a HA zone
|
|
with two members, this may give a hint that the cluster nodes are in a split-brain scenario, or you've
|
|
found a bug in the cluster.
|
|
|
|
|
|
If you are running a cluster setup where the master/satellite executes checks on the client via
|
|
[top down command endpoint](06-distributed-monitoring.md#distributed-monitoring-top-down-command-endpoint) mode,
|
|
you might want to know which zones are affected.
|
|
|
|
This analysis assumes that clients which are not connected, have the string `connected` in their
|
|
service check result output and their state is `UNKNOWN`.
|
|
|
|
```
|
|
<4> => var res = {}; for (s in get_objects(Service)) { if (s.state==3) { if (match("*connected*", s.last_check_result.output)) { res[s.zone] += [s.host_name] } } }; for (k => v in res) { res[k] = len(v.unique()) }; res
|
|
|
|
{
|
|
Asia = 31.000000
|
|
Europe = 214.000000
|
|
USA = 207.000000
|
|
}
|
|
```
|
|
|
|
The result set shows the configured zones and their affected hosts in a unique list. The output also just prints the numbers
|
|
but you can adjust this by omitting the `len()` call inside the for loop.
|
|
|
|
## Notifications Troubleshooting <a id="troubleshooting-notifications"></a>
|
|
|
|
### Notifications are not sent <a id="notifications-not-sent"></a>
|
|
|
|
* Check the [debug log](15-troubleshooting.md#troubleshooting-enable-debug-output) to see if a notification is triggered.
|
|
* If yes, verify that all conditions are satisfied.
|
|
* Are any errors on the notification command execution logged?
|
|
|
|
Please ensure to add these details with your own description
|
|
to any question or issue posted to the community channels.
|
|
|
|
Verify the following configuration:
|
|
|
|
* Is the host/service `enable_notifications` attribute set, and if so, to which value?
|
|
* Do the [notification](09-object-types.md#objecttype-notification) attributes `states`, `types`, `period` match the notification conditions?
|
|
* Do the [user](09-object-types.md#objecttype-user) attributes `states`, `types`, `period` match the notification conditions?
|
|
* Are there any notification `begin` and `end` times configured?
|
|
* Make sure the [notification](11-cli-commands.md#enable-features) feature is enabled.
|
|
* Does the referenced NotificationCommand work when executed as Icinga user on the shell?
|
|
|
|
If notifications are to be sent via mail, make sure that the mail program specified inside the
|
|
[NotificationCommand object](09-object-types.md#objecttype-notificationcommand) exists.
|
|
The name and location depends on the distribution so the preconfigured setting might have to be
|
|
changed on your system.
|
|
|
|
|
|
Examples:
|
|
|
|
```
|
|
# icinga2 feature enable notification
|
|
The feature 'notification' is already enabled.
|
|
```
|
|
|
|
```
|
|
# icinga2 feature enable debuglog
|
|
# systemctl restart icinga2
|
|
|
|
# grep Notification /var/log/icinga2/debug.log > /root/analyze_notification_problem.log
|
|
```
|
|
|
|
You can use the Icinga 2 API [event streams](12-icinga2-api.md#icinga2-api-event-streams) to receive live notification streams:
|
|
|
|
```
|
|
$ curl -k -s -u root:icinga -H 'Accept: application/json' -X POST 'https://localhost:5665/v1/events?queue=debugnotifications&types=Notification'
|
|
```
|
|
|
|
## Feature Troubleshooting <a id="troubleshooting-features"></a>
|
|
|
|
### Feature is not working <a id="feature-not-working"></a>
|
|
|
|
* Make sure that the feature configuration is enabled by symlinking from `features-available/`
|
|
to `features-enabled` and that the latter is included in [icinga2.conf](04-configuring-icinga-2.md#icinga2-conf).
|
|
* Are the feature attributes set correctly according to the documentation?
|
|
* Any errors on the logs?
|
|
|
|
Look up the [object type](09-object-types.md#object-types) for the required feature and verify it is enabled:
|
|
|
|
```
|
|
# icinga2 object list --type <feature object type>
|
|
```
|
|
|
|
Example for the `graphite` feature:
|
|
|
|
```
|
|
# icinga2 object list --type GraphiteWriter
|
|
```
|
|
|
|
Look into the log and check whether the feature logs anything specific for this matter.
|
|
|
|
```
|
|
grep GraphiteWriter /var/log/icinga2/icinga2.log
|
|
```
|
|
|
|
## REST API Troubleshooting <a id="troubleshooting-api"></a>
|
|
|
|
In order to analyse errors on API requests, you can explicitly enable the [verbose parameter](12-icinga2-api.md#icinga2-api-parameters-global).
|
|
|
|
```
|
|
$ curl -k -s -u root:icinga -H 'Accept: application/json' -X DELETE 'https://localhost:5665/v1/objects/hosts/example-cmdb?pretty=1&verbose=1'
|
|
{
|
|
"diagnostic_information": "Error: Object does not exist.\n\n ....",
|
|
"error": 404.0,
|
|
"status": "No objects found."
|
|
}
|
|
```
|
|
|
|
## REST API Troubleshooting: No Objects Found <a id="troubleshooting-api-no-objects-found"></a>
|
|
|
|
Please note that the `404` status with no objects being found can also originate
|
|
from missing or too strict object permissions for the authenticated user.
|
|
|
|
This is a security feature to disable object name guessing. If this would not be the
|
|
case, restricted users would be able to get a list of names of your objects just by
|
|
trying every character combination.
|
|
|
|
In order to analyse and fix the problem, please check the following:
|
|
|
|
- use an administrative account with full permissions to check whether the objects are actually there.
|
|
- verify the permissions on the affected ApiUser object and fix them.
|
|
|
|
|
|
## Certificate Troubleshooting <a id="troubleshooting-certificate"></a>
|
|
|
|
### Certificate Verification <a id="troubleshooting-certificate-verification"></a>
|
|
|
|
If the TLS handshake fails when a client connects to the cluster or the REST API,
|
|
ensure to verify the used certificates.
|
|
|
|
Print the CA and client certificate and ensure that the following attributes are set:
|
|
|
|
* Version must be 3.
|
|
* Serial number is a hex-encoded string.
|
|
* Issuer should be your certificate authority (defaults to `Icinga CA` for all CLI commands).
|
|
* Validity, meaning to say the certificate is not expired.
|
|
* Subject with the common name (CN) matches the client endpoint name and its FQDN.
|
|
* v3 extensions must set the basic constraint for `CA:TRUE` (ca.crt) or `CA:FALSE` (client certificate).
|
|
* Subject Alternative Name is set to a proper DNS name (required for REST API and browsers).
|
|
|
|
|
|
```
|
|
# cd /var/lib/icinga2/certs/
|
|
```
|
|
|
|
CA certificate:
|
|
|
|
```
|
|
# openssl x509 -in ca.crt -text
|
|
|
|
Certificate:
|
|
Data:
|
|
Version: 3 (0x2)
|
|
Serial Number: 1 (0x1)
|
|
Signature Algorithm: sha256WithRSAEncryption
|
|
Issuer: CN=Icinga CA
|
|
Validity
|
|
Not Before: Feb 23 14:45:32 2016 GMT
|
|
Not After : Feb 19 14:45:32 2031 GMT
|
|
Subject: CN=Icinga CA
|
|
Subject Public Key Info:
|
|
Public Key Algorithm: rsaEncryption
|
|
Public-Key: (4096 bit)
|
|
Modulus:
|
|
...
|
|
Exponent: 65537 (0x10001)
|
|
X509v3 extensions:
|
|
X509v3 Basic Constraints: critical
|
|
CA:TRUE
|
|
Signature Algorithm: sha256WithRSAEncryption
|
|
...
|
|
```
|
|
|
|
Client public certificate:
|
|
|
|
```
|
|
# openssl x509 -in icinga2-client1.localdomain.crt -text
|
|
|
|
Certificate:
|
|
Data:
|
|
Version: 3 (0x2)
|
|
Serial Number:
|
|
86:47:44:65:49:c6:65:6b:5e:6d:4f:a5:fe:6c:76:05:0b:1a:cf:34
|
|
Signature Algorithm: sha256WithRSAEncryption
|
|
Issuer: CN=Icinga CA
|
|
Validity
|
|
Not Before: Aug 20 16:20:05 2016 GMT
|
|
Not After : Aug 17 16:20:05 2031 GMT
|
|
Subject: CN=icinga2-client1.localdomain
|
|
Subject Public Key Info:
|
|
Public Key Algorithm: rsaEncryption
|
|
Public-Key: (4096 bit)
|
|
Modulus:
|
|
...
|
|
Exponent: 65537 (0x10001)
|
|
X509v3 extensions:
|
|
X509v3 Basic Constraints: critical
|
|
CA:FALSE
|
|
X509v3 Subject Alternative Name:
|
|
DNS:icinga2-client1.localdomain
|
|
Signature Algorithm: sha256WithRSAEncryption
|
|
...
|
|
```
|
|
|
|
Make sure to verify the client's certificate and its received `ca.crt` in `/var/lib/icinga2/certs` and ensure that
|
|
both instances are signed by the **same CA**.
|
|
|
|
```
|
|
# openssl verify -verbose -CAfile /var/lib/icinga2/certs/ca.crt /var/lib/icinga2/certs/icinga2-master1.localdomain.crt
|
|
icinga2-master1.localdomain.crt: OK
|
|
|
|
# openssl verify -verbose -CAfile /var/lib/icinga2/certs/ca.crt /var/lib/icinga2/certs/icinga2-client1.localdomain.crt
|
|
icinga2-client1.localdomain.crt: OK
|
|
```
|
|
|
|
Fetch the `ca.crt` file from the client node and compare it to your master's `ca.crt` file:
|
|
|
|
```
|
|
# scp icinga2-client1:/var/lib/icinga2/certs/ca.crt test-client-ca.crt
|
|
# diff -ur /var/lib/icinga2/certs/ca.crt test-client-ca.crt
|
|
```
|
|
|
|
On SLES11 you'll need to use the `openssl1` command instead of `openssl`.
|
|
|
|
<!--
|
|
### Certificate Signing <a id="troubleshooting-certificate-signing"></a>
|
|
-->
|
|
|
|
|
|
### Certificate Problems with OpenSSL 1.1.0 <a id="troubleshooting-certificate-openssl-1-1-0"></a>
|
|
|
|
Users have reported problems with SSL certificates inside a distributed monitoring setup when they
|
|
|
|
* updated their Icinga 2 package to 2.7.0 on Windows or
|
|
* upgraded their distribution which included an update to OpenSSL 1.1.0.
|
|
|
|
Example during startup on a Windows client:
|
|
|
|
```
|
|
critical/SSL: Error loading and verifying locations in ca key file 'C:\ProgramData\icinga2\etc/icinga2/pki/ca.crt': 219029726, "error:0D0E20DE:asn1 encoding routines:c2i_ibuf:illegal zero content"
|
|
critical/config: Error: Cannot make SSL context for cert path: 'C:\ProgramData\icinga2\etc/icinga2/pki/client.crt' key path: 'C:\ProgramData\icinga2\etc/icinga2/pki/client.key' ca path: 'C:\ProgramData\icinga2\etc/icinga2/pki/ca.crt'.
|
|
```
|
|
|
|
A technical analysis and solution for re-creating the public CA certificate is
|
|
available in [this advisory](https://icinga.com/2017/08/30/advisory-for-ssl-problems-with-leading-zeros-on-openssl-1-1-0/).
|
|
|
|
|
|
## Cluster and Clients Troubleshooting <a id="troubleshooting-cluster"></a>
|
|
|
|
This applies to any Icinga 2 node in a [distributed monitoring setup](06-distributed-monitoring.md#distributed-monitoring-scenarios).
|
|
|
|
You should configure the [cluster health checks](06-distributed-monitoring.md#distributed-monitoring-health-checks) if you haven't
|
|
done so already.
|
|
|
|
> **Note**
|
|
>
|
|
> Some problems just exist due to wrong file permissions or applied packet filters. Make
|
|
> sure to check these in the first place.
|
|
|
|
### Cluster Troubleshooting Connection Errors <a id="troubleshooting-cluster-connection-errors"></a>
|
|
|
|
General connection errors could be one of the following problems:
|
|
|
|
* Incorrect network configuration
|
|
* Packet loss
|
|
* Firewall rules preventing traffic
|
|
|
|
Use tools like `netstat`, `tcpdump`, `nmap`, etc. to make sure that the cluster communication
|
|
works (default port is `5665`).
|
|
|
|
```
|
|
# tcpdump -n port 5665 -i any
|
|
|
|
# netstat -tulpen | grep icinga
|
|
|
|
# nmap icinga2-client1.localdomain
|
|
```
|
|
|
|
### Cluster Troubleshooting SSL Errors <a id="troubleshooting-cluster-ssl-errors"></a>
|
|
|
|
If the cluster communication fails with SSL error messages, make sure to check
|
|
the following
|
|
|
|
* File permissions on the SSL certificate files
|
|
* Does the used CA match for all cluster endpoints?
|
|
* Verify the `Issuer` being your trusted CA
|
|
* Verify the `Subject` containing your endpoint's common name (CN)
|
|
* Check the validity of the certificate itself
|
|
|
|
Try to manually connect from `icinga2-client1.localdomain` to the master node `icinga2-master1.localdomain`:
|
|
|
|
```
|
|
# openssl s_client -CAfile /var/lib/icinga2/certs/ca.crt -cert /var/lib/icinga2/certs/icinga2-client1.localdomain.crt -key /var/lib/icinga2/certs/icinga2-client1.localdomain.key -connect icinga2-master1.localdomain:5665
|
|
|
|
CONNECTED(00000003)
|
|
---
|
|
...
|
|
```
|
|
|
|
If the connection attempt fails or your CA does not match, [verify the certificates](15-troubleshooting.md#troubleshooting-certificate-verification).
|
|
|
|
|
|
#### Cluster Troubleshooting Unauthenticated Clients <a id="troubleshooting-cluster-unauthenticated-clients"></a>
|
|
|
|
Unauthenticated nodes are able to connect. This is required for client setups.
|
|
|
|
Master:
|
|
|
|
```
|
|
[2015-07-13 18:29:25 +0200] information/ApiListener: New client connection for identity 'icinga2-client1.localdomain' (unauthenticated)
|
|
```
|
|
|
|
Client as command execution bridge:
|
|
|
|
```
|
|
[2015-07-13 18:29:26 +1000] notice/ClusterEvents: Discarding 'execute command' message from 'icinga2-master1.localdomain': Invalid endpoint origin (client not allowed).
|
|
```
|
|
|
|
If these messages do not go away, make sure to [verify the master and client certificates](15-troubleshooting.md#troubleshooting-certificate-verification).
|
|
|
|
### Cluster Troubleshooting Message Errors <a id="troubleshooting-cluster-message-errors"></a>
|
|
|
|
When the network connection is broken or gone, the Icinga 2 instances will be disconnected.
|
|
If the connection can't be re-established between endpoints in the same HA zone,
|
|
they remain in a Split-Brain-mode and history may differ.
|
|
|
|
Although the Icinga 2 cluster protocol stores historical events in a [replay log](15-troubleshooting.md#troubleshooting-cluster-replay-log)
|
|
for later synchronisation, you should make sure to check why the network connection failed.
|
|
|
|
Ensure to setup [cluster health checks](06-distributed-monitoring.md#distributed-monitoring-health-checks)
|
|
to monitor all endpoints and zones connectivity.
|
|
|
|
### Cluster Troubleshooting Command Endpoint Errors <a id="troubleshooting-cluster-command-endpoint-errors"></a>
|
|
|
|
Command endpoints can be used [for clients](06-distributed-monitoring.md#distributed-monitoring-top-down-command-endpoint)
|
|
as well as inside an [High-Availability cluster](06-distributed-monitoring.md#distributed-monitoring-scenarios).
|
|
|
|
There is no cli command for manually executing the check, but you can verify
|
|
the following (e.g. by invoking a forced check from the web interface):
|
|
|
|
* `/var/log/icinga2/icinga2.log` contains connection and execution errors.
|
|
* The ApiListener is not enabled to [accept commands](06-distributed-monitoring.md#distributed-monitoring-top-down-command-endpoint).
|
|
* `CheckCommand` definition not found on the remote client.
|
|
* Referenced check plugin not found on the remote client.
|
|
* Runtime warnings and errors, e.g. unresolved runtime macros or configuration problems.
|
|
* Specific error messages are also populated into `UNKNOWN` check results including a detailed error message in their output.
|
|
* Verify the `check_source` object attribute. This is populated by the node executing the check.
|
|
* More verbose logs are found inside the [debug log](15-troubleshooting.md#troubleshooting-enable-debug-output).
|
|
|
|
* Use the Icinga 2 API [event streams](12-icinga2-api.md#icinga2-api-event-streams) to receive live check result streams.
|
|
|
|
Fetch all check result events matching the `event.service` name `remote-client`:
|
|
|
|
```
|
|
$ curl -k -s -u root:icinga -H 'Accept: application/json' -X POST 'https://localhost:5665/v1/events?queue=debugcommandendpoint&types=CheckResult&filter=match%28%22remote-client*%22,event.service%29'
|
|
```
|
|
|
|
|
|
|
|
### Cluster Troubleshooting Config Sync <a id="troubleshooting-cluster-config-sync"></a>
|
|
|
|
If the cluster zones do not sync their configuration, make sure to check the following:
|
|
|
|
* Within a config master zone, only one configuration master is allowed to have its config in `/etc/icinga2/zones.d`.
|
|
** The master syncs the configuration to `/var/lib/icinga2/api/zones/` during startup and only syncs valid configuration to the other nodes.
|
|
** The other nodes receive the configuration into `/var/lib/icinga2/api/zones/`.
|
|
* The `icinga2.log` log file in `/var/log/icinga2` will indicate whether this ApiListener
|
|
[accepts config](06-distributed-monitoring.md#distributed-monitoring-top-down-config-sync), or not.
|
|
|
|
Verify the object's [version](09-object-types.md#object-types) attribute on all nodes to
|
|
check whether the config update and reload was successful or not.
|
|
|
|
|
|
### Cluster Troubleshooting Overdue Check Results <a id="troubleshooting-cluster-check-results"></a>
|
|
|
|
If your master does not receive check results (or any other events) from the child zones
|
|
(satellite, clients, etc.), make sure to check whether the client sending in events
|
|
is allowed to do so.
|
|
|
|
> **Tip**
|
|
>
|
|
> General troubleshooting hints on late check results are documented [here](15-troubleshooting.md#late-check-results).
|
|
|
|
The [distributed monitoring conventions](06-distributed-monitoring.md#distributed-monitoring-conventions)
|
|
apply. So, if there's a mismatch between your client node's endpoint name and its provided
|
|
certificate's CN, the master will deny all events.
|
|
|
|
> **Tip**
|
|
>
|
|
> [Icinga Web 2](02-getting-started.md#setting-up-icingaweb2) provides a dashboard view
|
|
> for overdue check results.
|
|
|
|
Enable the [debug log](15-troubleshooting.md#troubleshooting-enable-debug-output) on the master
|
|
for more verbose insights.
|
|
|
|
If the client cannot authenticate, it's a more general [problem](15-troubleshooting.md#troubleshooting-cluster-unauthenticated-clients).
|
|
|
|
The client's endpoint is not configured on nor trusted by the master node:
|
|
|
|
```
|
|
Discarding 'check result' message from 'icinga2-client1.localdomain': Invalid endpoint origin (client not allowed).
|
|
```
|
|
|
|
The check result message sent by the client does not belong to the zone the checkable object is
|
|
in on the master:
|
|
|
|
```
|
|
Discarding 'check result' message from 'icinga2-client1.localdomain': Unauthorized access.
|
|
```
|
|
|
|
|
|
### Cluster Troubleshooting Replay Log <a id="troubleshooting-cluster-replay-log"></a>
|
|
|
|
If your `/var/lib/icinga2/api/log` directory grows, it generally means that your cluster
|
|
cannot replay the log on connection loss and re-establishment. A master node for example
|
|
will store all events for not connected endpoints in the same and child zones.
|
|
|
|
Check the following:
|
|
|
|
* All clients are connected? (e.g. [cluster health check](06-distributed-monitoring.md#distributed-monitoring-health-checks)).
|
|
* Check your [connection](15-troubleshooting.md#troubleshooting-cluster-connection-errors) in general.
|
|
* Does the log replay work, e.g. are all events processed and the directory gets cleared up over time?
|
|
* Decrease the `log_duration` attribute value for that specific [endpoint](09-object-types.md#objecttype-endpoint).
|
|
|
|
|
|
|
|
### Cluster Troubleshooting: Windows Agents <a id="troubleshooting-cluster-windows-agents"></a>
|
|
|
|
#### Windows blocking Icinga 2 with ephemeral port range <a id="troubleshooting-cluster-windows-agents-ephemeral-port-range"></a>
|
|
|
|
When you see a message like this in your Windows agent logs:
|
|
|
|
```
|
|
critical/TcpSocket: Invalid socket: 10055, "An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full."
|
|
```
|
|
|
|
Windows is blocking Icinga 2 and as such, no more TCP connection handling is possible.
|
|
|
|
Depending on the version, patch level and installed applications, Windows is changing its
|
|
range of [ephemeral ports](https://en.wikipedia.org/wiki/Ephemeral_port#Range).
|
|
|
|
In order to solve this, raise the the `MaxUserPort` value in the registry.
|
|
|
|
```
|
|
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
|
|
|
|
Value Name: MaxUserPort Value
|
|
Type: DWORD
|
|
Value data: 65534
|
|
```
|
|
|
|
More details in [this blogpost](https://www.netways.de/blog/2019/01/24/windows-blocking-icinga-2-with-ephemeral-port-range/)
|
|
and this [MS help entry](https://support.microsoft.com/en-us/help/196271/when-you-try-to-connect-from-tcp-ports-greater-than-5000-you-receive-t).
|