Monitor netstat connection states using nagios.

[Kevin Keane]

asam30 at gmail.com wrote:
>
> Hi All,
>
> I am using check_tcp to check status of a particular port on the 
> server. This is working good. I would also need to monitor LISTEN 
> status (SYN_RECV) of that port. for ex,
>
> I have a ldap service running on port 3890, so the command
>
> netstat  -anp  | grep 3890
>
> tcp        0      0 0.0.0.0:3890 <http://0.0.0.0:3890/>                  
>    0.0.0.0:*                           LISTEN             
> 16029/java         
> tcp        0      0 10.121.30.121:3890 
> <http://10.121.30.121:3890/>          10.121.6.1:8831 
> <http://10.121.6.1:8831/>                ESTABLISHED 16029/java         
> tcp        0      0 10.121.30.121:3890 
> <http://10.121.30.121:3890/>          10.121.6.1:61052 
> <http://10.121.6.1:61052/>              ESTABLISHED 16029/java         
> tcp      228      0 10.121.30.121:3890 
> <http://10.121.30.121:3890/>          10.121.6.1:49440 
> <http://10.121.6.1:49440/>             ESTABLISHED 16029/java
> tcp        0      0 10.121.30.121:3890 
> <http://10.121.30.121:3890/>          10.121.6.1:11664 
> <http://10.121.6.1:11664/>               SYN_RECV    16029/java  
>
> The establish connections are ok to allow, but we need to monitor 
> SYN_RECV status. If there is any such(SYN_RECV) connection appears, we 
> immediately get an alert from nagios. Is there any way to monitor such 
> states with nagios or check_tcp?
>
> I have written some shell script to monitor such events, but also I 
> would like to integrate that scripts into nagios? Is that possible?
>
> Please help me or provide some suggestions
You can integrate almost any shell script you want into Nagios. All you 
need to do is implement the Nagios plugin specification, which is fairly 
trivial to do for most scripts. Return 0, 1 or 2 (OK, warn or critical) 
to as exit code, and return the actual result data via stdout in a 
single line. The details are in the Nagios documentation.

-- 
Kevin Keane
Owner
The NetTech
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