mirror of https://github.com/Icinga/icinga2.git
Documentation: Revamp the 'passing command parameters' section
fixes #9313
This commit is contained in:
Michael Friedrich
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@ -428,7 +428,7 @@ for not only matching for their existance or values in apply expressions, but al
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* [Apply scheduled downtimes to hosts and services](3-monitoring-basics.md#using-apply-scheduledowntimes)
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A more advanced example is using [apply with for loops on arrays or
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dictionaries](#using-apply-for) for example provided by
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dictionaries](3-monitoring-basics.md#using-apply-for) for example provided by
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[custom atttributes](3-monitoring-basics.md#custom-attributes) or groups.
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> **Tip**
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@ -731,7 +731,7 @@ The `CheckCommand` definition can be found in the
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> of the generated objects. Use the `object list` [CLI command](8-cli-commands.md#cli-command-object)
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> after successful [configuration validation](8-cli-commands.md#config-validation).
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Verify that the apply-for-rule succesfully created the service objects with the
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Verify that the apply-for-rule successfully created the service objects with the
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inherited custom attributes:
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# icinga2 daemon -C
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@ -1192,8 +1192,8 @@ partition defined (`-p`) it will check all local partitions.
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>
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> Don't execute plugins as `root` and always use the absolute path to the plugin! Trust us.
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Next step is to understand how command parameters are being passed from
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a host or service object, and add a [CheckCommand](6-object-types.md#objecttype-checkcommand)
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Next step is to understand how [command parameters](3-monitoring-basics.md#command-passing-parameters)
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are being passed from a host or service object, and add a [CheckCommand](6-object-types.md#objecttype-checkcommand)
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definition based on these required parameters and/or default values.
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Please continue reading in the [plugins section](13-addons-plugins.md#plugins) for additional integration examples.
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@ -1203,67 +1203,119 @@ Please continue reading in the [plugins section](13-addons-plugins.md#plugins) f
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Check command parameters are defined as custom attributes which can be accessed as runtime macros
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by the executed check command.
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Define the default check command custom attribute `disk_wfree` and `disk_cfree`
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(freely definable naming schema) and their default threshold values. You can
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The check command parameters for ITL provided plugin check command definitions are documented
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[here](7-icinga-template-library.md#plugin-check-commands), for example
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[disk](7-icinga-template-library.md#plugin-check-command-disk).
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In order to practice passing command parameters you should [integrate your own plugin](3-monitoring-basics.md#command-plugin-integration).
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The following example will use `check_mysql` provided by the [Monitoring Plugins installation](2-getting-started.md#setting-up-check-plugins).
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Define the default check command custom attributes, for example `mysql_user` and `mysql_password`
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(freely definable naming schema) and optional their default threshold values. You can
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then use these custom attributes as runtime macros for [command arguments](3-monitoring-basics.md#command-arguments)
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on the command line.
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> **Tip**
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>
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> Use a common command type as prefix for your command arguments to increase
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> readability. `disk_wfree` helps understanding the context better than just
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> `wfree` as argument.
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> readability. `mysql_user` helps understanding the context better than just
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> `user` as argument.
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The default custom attributes can be overridden by the custom attributes
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defined in the service using the check command `my-disk`. The custom attributes
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defined in the host or service using the check command `my-mysql`. The custom attributes
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can also be inherited from a parent template using additive inheritance (`+=`).
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object CheckCommand "my-disk" {
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# vim /etc/icinga2/conf.d/commands.conf
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object CheckCommand "my-mysql" {
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import "plugin-check-command"
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command = [ PluginDir + "/check_disk" ]
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command = [ PluginDir + "/check_mysql" ] //constants.conf -> const PluginDir
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arguments = {
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"-w" = {
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value = "$disk_wfree$"
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description = "Exit with WARNING status if less than INTEGER units of disk are free or Exit with WARNING status if less than PERCENT of disk space is free"
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"-H" = "$mysql_host$"
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"-u" = {
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required = true
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value = "$mysql_user$"
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}
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"-c" = {
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value = "$disk_cfree$"
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description = "Exit with CRITICAL status if less than INTEGER units of disk are free or Exit with CRITCAL status if less than PERCENT of disk space is free"
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required = true
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"-p" = "$mysql_password$"
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"-P" = "$mysql_port$"
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"-s" = "$mysql_socket$"
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"-a" = "$mysql_cert$"
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"-d" = "$mysql_database$"
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"-k" = "$mysql_key$"
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"-C" = "$mysql_ca_cert$"
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"-D" = "$mysql_ca_dir$"
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"-L" = "$mysql_ciphers$"
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"-f" = "$mysql_optfile$"
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"-g" = "$mysql_group$"
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"-S" = {
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set_if = "$mysql_check_slave$"
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description = "Check if the slave thread is running properly."
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}
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"-W" = {
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value = "$disk_inode_wfree$"
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description = "Exit with WARNING status if less than PERCENT of inode space is free"
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}
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"-K" = {
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value = "$disk_inode_cfree$"
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description = "Exit with CRITICAL status if less than PERCENT of inode space is free"
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}
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"-p" = {
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value = "$disk_partitions$"
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description = "Path or partition (may be repeated)"
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repeat_key = true
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order = 1
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}
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"-x" = {
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value = "$disk_partitions_excluded$"
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description = "Ignore device (only works if -p unspecified)"
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"-l" = {
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set_if = "$mysql_ssl$"
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description = "Use ssl encryption"
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}
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}
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vars.disk_wfree = "20%"
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vars.disk_cfree = "10%"
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vars.mysql_check_slave = false
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vars.mysql_ssl = false
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vars.mysql_host = "$address$"
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}
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> **Note**
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>
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> A proper example for the `check_disk` plugin is already shipped with Icinga 2
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> ready to use with the [plugin check commands](7-icinga-template-library.md#plugin-check-command-disk).
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The check command definition also sets `mysql_host` to the `$address$` default value. You can override
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this command parameter if for example your MySQL host is not running on the same server's ip address.
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The host `localhost` with the applied service `basic-partitions` checks a basic set of disk partitions
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Make sure pass all required command parameters, such as `mysql_user`, `mysql_password` and `mysql_database`.
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`MysqlUsername` and `MysqlPassword` are specified as [global constants](4-configuring-icinga-2.md#constants-conf)
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in this example.
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# vim /etc/icinga2/conf.d/services.conf
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apply Service "mysql-icinga-db-health" {
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import "generic-service"
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check_command = "my-mysql"
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vars.mysql_user = MysqlUsername
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vars.mysql_password = MysqlPassword
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vars.mysql_database = "icinga"
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vars.mysql_host = "192.168.33.11"
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assign where match("icinga2*", host.name)
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ignore where host.vars.no_health_check == true
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}
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Take a different example: The example host configuration in [hosts.conf](4-configuring-icinga-2.md#hosts-conf)
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also applies an `ssh` service check. Your host's ssh port is not the default `22`, but set to `2022`.
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You can pass the command parameter as custom attribute `ssh_port` directly inside the service apply rule
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inside [services.conf](4-configuring-icinga-2.md#services-conf):
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apply Service "ssh" {
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import "generic-service"
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check_command = "ssh"
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vars.ssh_port = 2022 //custom command parameter
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assign where (host.address || host.address6) && host.vars.os == "Linux"
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}
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If you prefer this being configured at the host instead of the service, modify the host configuration
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object instead. The runtime macro resolving order is described [here](3-monitoring-basics.md#macro-evaluation-order).
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object Host NodeName {
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...
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vars.ssh_port = 2022
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}
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#### <a id="command-passing-parameters-apply-for"></a> Passing Check Command Parameters Using Apply For
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The host `localhost` with the generated services from the `basic-partitions` dictionary (see
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[apply for](3-monitoring-basics.md#using-apply-for) for details) checks a basic set of disk partitions
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with modified custom attributes (warning thresholds at `10%`, critical thresholds at `5%`
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free disk space).
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