Nagios reports its own host as DOWN

Alnis Morics alnis.morics at
Wed Sep 21 10:12:06 UTC 2016

 >I installed nagios4-4.1.1_5,1 on a FreeBSD 10.3 jail. (It's my first
 >time with Nagios)
 >I managed the core to show up as working, and the system now lists its
 >first host (the one it is installed on) -- as DOWN.
 >Small wander, because the way it checks this is by pinging "localhost"
 >(/sbin/ping -n -c 5 ), although ping is disabled in my jail
 >(as per default), and its localhost address is changed to
 >How can I correct this checking? I found there is a script for checking
 >FreeBSD jails
 >but, again, I can't find any hint of how to use it or whether it can
 >help me at all. Will I be able to check services on jails of other
 >Thanks for any advice,

Ok, sorted out by myself, sorry for the noise.

1. Although I already changed the localhost's address in /etc/hosts on 
the jail, Nagios doesn't respect it. It needs the address defined at 

2. If I'm going to use this jail as a Nagios host, I'll need the ping 
enabled anyway for checking other hosts, so I enabled it. Now the Nagios 
host appears as UP.


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