Host status never returns to UP

[Kirk Hoganson]

I figured this out, and decided to post the solution for those who have 
had similar problems.  I have recently seen posts about similar 
problems, though I don't believe they were using check_by_ssh, the 
solution should be the same.

The problem is really a simple configuration problem.  Even if you are 
using a check_ping check that is returning an OK result, this is not the 
check that nagios uses to determine the UP/DOWN status of a host.  The 
check used by nagios for each host is determined in the hosts.cfg, and 
is not always the same as any command you might be using to correctly 
ping the host.  By default that command is check-host-alive.  If for 
example you are using check_by_ssh to ping hosts in private network, the 
check-host-alive will fail and your hosts will never return to an UP 
status, even if the host comes up and your ping using check_by_ssh 
returns an OK.

Once you understand the problem, the solution is obvious.

Kirk Hoganson wrote:
> I am monitoring the status of several servers using check_by_ssh to run 
> a check_ping (this is necessary given the network topology).  It will 
> monitor the status without difficulty until the server goes down.  At 
> which point it will send a critical alert.  However, once the server 
> comes up it will never send a recovery alert.
> 
> When the server comes up, the status log will show that the PING is now 
> OK, but the host status will never reset to UP.  It will remain in a 
> DOWN state, until Nagios is restarted.
> 
> Any thoughts from anyone...  The notification options for the service 
> specify notification on recovery.  The problem is that even though the 
> ping becomes OK, the server status never becomes UP.
> 
> Has anyone seen anything like this?
> 
> 


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