[SOLVED] Disabled nagios service starts on update (CentOS 6)

genese · 12-14-2017, 06:15 AM

Hi,

Nagios is installed because I need a few plugins, but I don't run it. I use only nrpe.

Here are the relevant chkconfig lines :

Code:

nagios          0:off   1:off   2:off   3:off   4:off   5:off   6:off        
nrpe            0:off   1:off   2:on    3:on    4:on    5:on    6:off

No problem with this setup for years.

Now, the nagios service is started after each update.

How do I stop this behavior ?

MensaWater · 12-14-2017, 07:53 AM

Review /etc/init.d/nrpe and see if it has anything in it that starts Nagios as a dependency. You might also just do
"grep -i nagios /etc/init.d/*" to see if any new startup script has been created which is turned on.

Also a lot of people put Nagios in xinit.d rather than running it as a standalone. Is it possible what you're seeing is the Nagios port being LISTENed on by xinit.d rather than Nagios daemon actually running?

genese · 12-14-2017, 10:25 AM

Quote:

Originally Posted by MensaWater

Review /etc/init.d/nrpe and see if it has anything in it that starts Nagios as a dependency. You might also just do
"grep -i nagios /etc/init.d/*" to see if any new startup script has been created which is turned on.

Nothing found

Quote:

Also a lot of people put Nagios in xinit.d rather than running it as a standalone. Is it possible what you're seeing is the Nagios port being LISTENed on by xinit.d rather than Nagios daemon actually running?

No, it's the real thing

Code:

# ps -eaf | grep nagios
nrpe      4711     1  0 16:53 ?        00:00:00 /usr/sbin/nrpe -c /etc/nagios/nrpe.cfg -d
nagios    4971     1  0 16:54 ?        00:00:00 /usr/sbin/nagios -d /etc/nagios/nagios.cfg
nagios    4973  4971  0 16:54 ?        00:00:00 /usr/sbin/nagios --worker /var/spool/nagios/cmd/nagios.qh
.
.
nagios    4984  4971  0 16:54 ?        00:00:00 /usr/sbin/nagios --worker /var/spool/nagios/cmd/nagios.qh

The problem seem to be related more to the update process (yum ? rpm ?) than dependencies :

Restarting nrpe doesn't start nagios.

"yum reinstall nagios" starts nagios.

MadeInGermany · 12-14-2017, 01:03 PM

Why
yum reinstall nagios
and not
yum update nagios
?

genese · 12-14-2017, 01:38 PM

Quote:

Why yum reinstall nagios and not yum update nagios ?

because my nagios is up to date.

so "update" will do nothing.

I'm debugging a problem, not doing a normal server management.

MensaWater · 12-14-2017, 01:52 PM

So this only happens on the (re)install? If so why not just run "service nagios stop" after the reinstall and verify it leaves nrpe running?

Maybe the start of Nagios is occurring as part of the postinstall step of the rpm?

genese · 12-14-2017, 02:22 PM

Quote:

Originally Posted by MensaWater

So this only happens on the (re)install? If so why not just run "service nagios stop" after the reinstall and verify it leaves nrpe running?

Yes, I do it after each update. A few days later to be precise, because the start of nagios service with a nearly empty .cfg is quite silent.

Of course this problem is not critical. If it was, I would not be here discussing about it.

Quote:

Maybe the start of Nagios is occurring as part of the postinstall step of the rpm?

Yes, it's my feeling since the beginning.

genese · 12-15-2017, 10:12 AM

As I mark this thread as solved, I must left a pointer to the accepted solution : https://www.linuxquestions.org/quest...ort-4175619584