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Login and systemd

We recommend creating a zabbix user as system user, that is, without ability to log in. Some users ignore this recommendation and use the same account to log in (e. g. using SSH) to host running Zabbix. This might crash Zabbix daemon on log out. In this case you will get something like the following in Zabbix server log:

zabbix_server [27730]: [file:'selfmon.c',line:375] lock failed: [22] Invalid argument
zabbix_server [27716]: [file:'dbconfig.c',line:5266] lock failed: [22] Invalid argument
zabbix_server [27706]: [file:'log.c',line:238] lock failed: [22] Invalid argument

and in Zabbix agent log:

zabbix_agentd [27796]: [file:'log.c',line:238] lock failed: [22] Invalid argument

This happens because of default systemd setting RemoveIPC=yes configured in /etc/systemd/logind.conf. When you log out of the system the semaphores created by Zabbix previously are removed which causes the crash.

A quote from systemd documentation:


Controls whether System V and POSIX IPC objects belonging to the user shall be removed when the
user fully logs out. Takes a boolean argument. If enabled, the user may not consume IPC resources
after the last of the user's sessions terminated. This covers System V semaphores, shared memory
and message queues, as well as POSIX shared memory and message queues. Note that IPC objects of the
root user and other system users are excluded from the effect of this setting. Defaults to "yes".

There are 2 solutions to this problem:

  1. (recommended) Stop using zabbix account for anything else than Zabbix processes, create a dedicated account for other things.
  2. (not recommended) Set RemoveIPC=no in /etc/systemd/logind.conf and reboot the system. Note that RemoveIPC is a system-wide parameter, changing it will affect the whole system.