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    Nagios Error: nrpe.service: main process exited, status=2/INVALIDARGUMENT

    Nagios is a free opensource monitoring system. We get this error on a Nagios rhel7 client, while configuring it for monitoring. The nrpe service could not start due to following error.
    Error:


    Nagios




















    Jan 29 06:29:12 solr-node1 nrpe[101779]: Cannot write to pidfile '/var/run/nrpe.pid' - check your privileges.
    Jan 29 06:29:12 solr-node1 systemd[1]: nrpe.service: main process exited, code=exited, status=2/INVALIDARGUMENT



    Solution:

    1. Please change the "pid_file=/var/run/nrpe.pid" in /etc/nagios/nrpe.cfg to following.


    # PID FILE
    pid_file=/var/run/nrpe/nrpe.pid
    2. Restart the nrpe service.
    /bin/systemctl restart  nrpe.service
    3. Check the status.
    /bin/systemctl status  nrpe.service



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