Nagios Support Forum

Posted: **Fri Nov 05, 2021 4:20 pm**

Our NCPA agent running on Ubuntu 16.04 showed an "Active (exited)" status when checking with "systemctl status ncpa_listener". When we looked back in the syslog we saw the following:
Nov 2 08:51:34 pxxxx ncpa_listener[3178]: Started NCPA Listener
...
Nov 2 09:20:00 pxxxx systemd[1]: Started LSB: This manages the NCPA Passive service.
Nov 2 09:20:00 pxxxx ncpa_listener[3234]: another instance seems to be running (pid 3290), exiting

We'd like to know how NCPA finds out whether there's an instance already running.

Thanks,
Steve

Posted: **Mon Nov 08, 2021 12:40 pm**

Hi Steve,

NCPA looks for another running instance by locating and validating the contents of the process identification (pid) file:

Code: Select all

/usr/local/ncpa/var/run/ncpa_listener.pid
/usr/local/ncpa/var/run/ncpa_passive.pid

The routine for the listener can be found here (check_pid function starts on line 320):

https://github.com/NagiosEnterprises/nc ... adaemon.py

Thanks and Best Regards,
Keith

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