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Merge pull request #7082 from Icinga/feature/docs-troubleshooting 

Troubleshooting docs: Add Windows agents without NodeName constant
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Michael Friedrich 2019-04-04 15:42:52 +02:00 committed by GitHub
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@ -1067,6 +1067,33 @@ Check the following:
### Cluster Troubleshooting: Windows Agents <a id="troubleshooting-cluster-windows-agents"></a>
#### Windows Agents consuming 100% CPU <a id="troubleshooting-cluster-windows-agents-cpu"></a>
Icinga 2 requires the `NodeName` [constant](17-language-reference.md#constants) in various places to run.
This includes loading the TLS certificates, setting the proper check source,
and so on.
Typically the Windows setup wizard and also the CLI commands populate the [constants.conf](04-configuring-icinga-2.md#constants-conf)
file with the auto-detected or user-provided FQDN/Common Name.
If this constant is not set during startup, Icinga will try to resolve the
FQDN, if that fails, fetch the hostname. If everything fails, it logs
an error and sets this to `localhost`. This results in undefined behaviour
if ignored by the admin.
Querying the DNS when not reachable is CPU consuming, and may look like Icinga
is doing lots of checks, etc. but actually really is just starting up.
In order to fix this, edit the `constants.conf` file and populate
the `NodeName` constant with the FQDN. Ensure this is the same value
as the local endpoint object name.
```
const NodeName = "windows-client1.domain.com"
```
#### 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: