ZBX_NOTSUPPORTED while work with -t

[frankcheong]

I have written a script to obtain the max no of open files for a particular process and I can successfully collect the value by directly issuing the command in OS as well as testing the option with zabbix_agentd -t while it didn't work with zabbix_get as well as the web interface reported ZBX_NOTSUPPORTED. Please find below config that I used to obtain the open file limit for a particular user (e.g. apache).

UserParameter=OpenFileLimit[*],/usr/bin/sudo /opt/zabbix/etc/maxFileOpen.sh "$1"

/opt/zabbix/etc/maxFileOpen.sh

#!/bin/bash

/bin/cat /proc/`/bin/ps -u ${1} -opid | /usr/bin/tail -1 | awk '{print $1}'`/limits | /bin/awk '/Max open files/ {print $5}'

[root@server ~]# /opt/zabbix/etc/maxFileOpen.sh apache
1024
[root@server ~]# /usr/bin/sudo -u zabbix /usr/bin/sudo /opt/zabbix/etc/maxFileOpen.sh apache
1024
[root@server ~]# /opt/zabbix/etc/maxFileOpen.sh "apache"
1024
[root@server ~]# /usr/bin/sudo -u zabbix /usr/bin/sudo /opt/zabbix/etc/maxFileOpen.sh "apache"
1024
[root@server ~]# /opt/zabbix/sbin/zabbix_agentd -t 'OpenFileLimit[apache]'
OpenFileLimit[apache]                    [t|1024]
[root@server ~]# /opt/zabbix/bin/zabbix_get -s 127.0.0.1 -key OpenFileLimit[apache]
ZBX_NOTSUPPORTED

In the zabbix log, it simply complain with :-

 21145:20120424:181052.529 Run remote command [/usr/bin/sudo /opt/zabbix/etc/maxFileOpen.sh "apache"] Result [0] []...
 21145:20120424:181052.529 Sending back [ZBX_NOTSUPPORTED]
 21143:20120424:181052.932 In update_cpustats()
 21143:20120424:181052.932 End of update_cpustats()

I have no idea on what would possibly be the problem, but I truly suspect the problem actually is permission related and I think I can get around this problem by setting the Allow Root to 1 but this is really not an ideal solution. Actually the zabbix_agentd is running under an non-privileged account zabbix. Does anyone have any idea?

The environment using is zabbix 1.8.9 under RHEL 5.3

[JBo]

Hi,

I also think it is related to permissions.

zabbix_agentd -t command is run as root but zabbix_get connects to zabbix_agent that is running as zabbix user.

Are you sure that your sudo configuration is correct ?
How have you configured /opt/zabbix/etc/maxFileOpen.sh in /etc/sudoers ?

Regards,
JBo

[frankcheong]

Ops, forgot to also put the sudoer file here:-

User_Alias MONITOR=zabbix
MONITOR ALL=NOPASSWD: ALL

[frankcheong]

Finally I know what is happening.

After upgrading to 1.8.12, the verbosity is much improved, I then located an error msg in the zabbix_agentd.log as below:-

sudo: sorry, you must have a tty to run sudo

After searching thru the internet. I found that in sudoer, there is a line:-

Defaults    requiretty

All I have to do is to remark this line

#Defaults    requiretty

And then everything works perfectly.