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Host Down

Description

At time T, the Monitoring Agent on host X had not detected a mongod process running on host Y port Z for A minutes.

Common Triggers

  • The mongod process could not be reached because of a network issue.
  • The mongod process is not running.
  • The host is powered off.

Possible Solutions

  • Verify network communication between the host running the Monitoring Agent and the host that is listed as down. One way to do this is through the mongo shell:

    mongo <hostname:port>
    

    If connecting from the mongo shell fails, try a basic ping test:

    ping <hostname>
    
  • Verify the mongod process is running:

    If the process was installed from deb or rpm package, query the service manager for the status:

    sudo service mongod status
    

    Alternatively, you can use ps:

    ps aux | grep mongo
    

Notes

The Host Down alert should not be used to detect all occurrences of a host rebooting. The alert is triggered only if the host is seen as down at the instant that the Monitoring Agent runs the check. The interval between checks can vary from 1 to 3 minutes.

Documentation

  • Host is down alert condition