Some active checks dont work on some servers

[Darkhunter]

Hello, I have 10 centOS servers under proxy. Proxy is updated so are zabbix-agents. They all have same CentOS version, but some of them are unable to work with active checks:
23662:20141123:191608.346 active check "system.run[cat /etc/centos-release]" is not supported
23662:20141123:191608.346 active check "system.run[yum list updates| tail -n +8| wc -l]" is not supported
Whats wrong? Settings are same on all servers.
RemoteCommands are enabled.

[kloczek]

Hello, I have 10 centOS servers under proxy. Proxy is updated so are zabbix-agents. They all have same CentOS version, but some of them are unable to work with active checks:
23662:20141123:191608.346 active check "system.run[cat /etc/centos-release]" is not supported
23662:20141123:191608.346 active check "system.run[yum list updates| tail -n +8| wc -l]" is not supported
Whats wrong? Settings are same on all servers.
RemoteCommands are enabled.

Check your SELinux settings for zabbix user.

[Darkhunter]

Okay, it worked on some servers, but on other servers it didnt:

9894:20150105:222754.078 In add_check() key:'system.run[yum list updates| tail -n +8| wc -l]' refresh:3600 lastlogsize:0 mtime:0
9894:20150105:222754.116 Executing command 'yum list updates| tail -n +8| wc -l'
9894:20150105:222754.116 In zbx_popen() command:'yum list updates| tail -n +8| wc -l'
9894:20150105:222757.117 active check "system.run[yum list updates| tail -n +8| wc -l]" is not supported
9894:20150105:222757.117 In process_value() key:'pmx1-ovh-alfresco.emeldi.com:system.run[yum list updates| tail -n +8| wc -l]' value:'Timeout while executing a shell script.'

And on zabbix_server we have 30 seconds timeout.
When I launch this command on server directly, it takes about half a sec to complete.

[jan.garaj]

9894:20150105:222757.117 In process_value() key:'pmx1-ovh-alfresco.emeldi.com:system.run[yum list updates| tail -n +8| wc -l]' value:'Timeout while executing a shell script.'

This is timeout on the agent side. Setup Timeout in your agent conf. And try to run your command as the zabbix user.

[Darkhunter]

It works! Thank you!