All HowTo's Linux Redhat, Fedora and CentOS Linux Ubuntu, Mint & Debian Linux

Zabbix Dealing with Cannot create semaphore set No space left on device

If you get this strange error when trying to start the Zabbix agent on a CentOS 7 or similar system, this article should help you solve the problem.

The article at “” explains the issue further. However, you can jump right to the solution in “this” article.

Issuing the command:

systemctl start zabbix-agent

Give the following error in the “/var/log/zabbix/zabbix_agentd.log” log file:

zabbix_agentd [27381]: cannot open log: cannot create semaphore set: [28] No space left on device

Issue the following command to remove unnecessary semaphores:

ipcrm -a

Try to start the Zabbix agent again. I bet it fails again but this time with an error like this:

listener failed: bind() for [[-]:10051] failed: [13] Permission denied

The above would likely be an SELinux issue. Try going into “permissive” mode to test it. The following is one solution to this:

grep "zabbix" /var/log/audit/audit.log | audit2allow -M zabbix_agent
semodule -i zabbix_agent.pp

Now try to restart the Zabbix agent:

systemctl restart zabbix-agent

And you should be good to go.

Leave a Reply

Your email address will not be published. Required fields are marked *