Nagios Support Forum

I need to change the IP address (not the hostname) of my Nagios Log Server.
I checked some of my Linux client servers that send logs, and noticed that the /etc/rsyslog.d/99-nagioslogserver.conf file on them contains the IP address-colon-port number of the Log Server.

So it seems that changing the IP of the Log Server would disrupt things.

Is there a way to solve this?

Yes, if you change the IP address of Log Server, and all of your clients are set to report their logs by IP address, then the configuration on each of your clients needs to be changed to reflect the new IP address. Unfortunately there's no easy way to go about doing this. The communication with Log Server is very much one-way. There's no way for Log Server to reach out to each client and tell them to update their config files.

The best you can get from Log Server is a list of all clients that are sending their logs to Log Server. From the Home screen just click on the Report link in the dashlet that shows the number of Unique Hosts. That will at least give you a list of the machines that need to be reconfigured.

It is unfortunate that when you run the setup-linux.sh script on a new client it uses the Log Server's IP instead of its hostname.
Maybe this should be changed in a future release.

You can pass the hostname when running the script:
Just make sure that client is able to resolve the hostname to the NLS machine's IP and you should be good. I can submit a feature request to make this more clear in steps provided in the web UI.

cdienger wrote: I can submit a feature request to make this more clear in steps provided in the web UI.

Yes, please do. I was unaware of this option, it would have saved me a lot of time.

It is also worth pointing out that if you set the Cluster Hostname in
Admin -> Global Settings

From that point forward the instructions will show that instead of the IP

Good to know, thank you.

chud wrote:Good to know, thank you.

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