nagios nrpe unable to read output
I'm trying to use check_nrpe to check on a remote server, but it's not working and I can't figure out what am I missing...
# /usr/lib/nagios/plugins/check_nrpe -H XXX -c check_load -a 6,5,4 8,7,6
NRPE: Unable to read output
#
remote's server syslog message:
nrpe[18058]: Connection from XX.XX.XX.XX port 16267
nrpe[18058]: Host address is in allowed_hosts
nrpe[18058]: Handling the connection...
nrpe[18058]: Host is asking for command 'check_load' to be run...
nrpe[18058]: Running command: /usr/bin/sudo /usr/lib64/nagios/plugins/check_load -w 6,5,4 -c 8,7,6
nrpe[18058]: Command completed with return code 1 and output:
nrpe[18058]: Return Code: 1, Output: NRPE: Unable to read output
nrpe[18058]: Connection from XX.XX.XX.XX closed.
to verify it manually, I issue same command on a remote shell:
bash-4.1$ id
uid=497(nrpe) gid=497(nrpe) groups=497(nrpe) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
bash-4.1$ /usr/bin/sudo /usr/lib64/nagios/plugins/check_load -w 6,5,4 -c 8,7,6
OK - load average: 0.21, 0.23, 0.19|load1=0.210;6.000;8.000;0; load5=0.230;5.000;7.000;0; load15=0.190;4.000;6.000;0;
bash-4.1$
Solution 1:
... the issue was even though nrpe_user inside of /etc/nagios/nrpe.cfg was set to nrpe, for whatever reason nrpe was running as nagios user instead, so I had to readjust sudoers.d file and it's start working right away ...
# grep nrpe_user /etc/nagios/nrpe.cfg
nrpe_user=nrpe
# ps auxwww | grep nrpe
nagios 25388 0.0 0.0 41332 1240 ? Ss 11:32 0:00 /usr/sbin/nrpe -c /etc/nagios/nrpe.cfg -d
root 26230 0.0 0.0 103252 828 pts/3 S+ 11:47 0:00 grep nrpe
# cat /etc/sudoers.d/01_nagios
Defaults:nagios !requiretty
nagios ALL=(ALL) NOPASSWD: /usr/lib64/nagios/plugins/
#
Solution 2:
This can be caused by sudo's "requiretty" setting. The real question, though, is why you're running check_load through sudo anyway.
So, to fix this: either disable requiretty (just for the nagios/nrpe user) or stop running the plugin through sudo.