Nagios XI: Some Tricks


I have been playing with Nagios XI since last week. Here are some tricks I have found so far:

1) The default root password is nagiosxi. The default root password for the Nagios XI VMware virtual appliance is nagiosxi, which can be found on the login screen.

2) ‘$’ is considered as an illegal character. Some interfaces of our routers contains $ in their names, like $Outside$. Nagios XI keeps the interface name as the service description (service_description) in the service configuration file when I use the router/switch monitor wizard to add those routers into monitor list. After that, I found my Nagios crashed. I did some analysis and removed the $ from the service_description, then Nagios was back to work again.

3) Performance graphs are missing. The issue disappeared after I reset the security crendential. You can also try these solutions.

4) Failed to login Nagios core manager. As the Nagios XI and Nagios Core use different credentials to allow multi-tenant capabilities. Reset the security credential for Nagios core manager.

5) No data shows on bandwidth graphs. This one took me a while to figure it out, in my case I did the following two to fix it.

  • Use SNMP Version 1 when adding switch/router by following the monitor wizard
  • Modify the /etc/cron.d/mrtg file to change ‘0-59/5 * * * * root /usr/bin/mrtg /etc/mrtg/mrtg.cfg’ to ‘0-59/5 * * * * root env LANG=C /usr/bin/mrtg /etc/mrtg/mrtg.cfg’

3 thoughts on “Nagios XI: Some Tricks

  1. Excellent post. Am delving into Nagios XI myself and wish I had found your post a bit sooner. I am still stuck on Nagios Core Manager logon. How do you reset the credentials for it as I am not able to logon to it at all?

  2. Do you have a Nagios XI user account with Admin privilege? If Yes, you can logon Nagios XI first, then change the credential for the Nagios Core Manager.

  3. Thanks for sharing useful information ,I too found one issue

    I tried & charecter in NagiosXI CoreConfigManager’ password but the password change is not accepting . so RodHatley might be using special characters to reset the password

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