All Linux HowTo's

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 “https://www.zabbix.com/forum/zabbix-troubleshooting-and-problems/355498-centos-7-zabbix-3-4-7-cannot-create-semaphore-28-no-space-left-on-device” 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.

Similar Posts:

Leave a Reply

Your email address will not be published.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

This site uses Akismet to reduce spam. Learn how your comment data is processed.