Thread: nagios -- number of postgres connections

anyone know a way to get nagios to monitor the number of postgres connections?

Thanks,
Whit

Whit Armstrong wrote:
> anyone know a way to get nagios to monitor the number of postgres connections?
>


a script that counts how many lines of postgres processes there are and
subtracts a few....


$ ps -C postmaster uww
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
postgres  2878  0.0  0.1 152036  1500 ?        S    Apr05  22:48
/usr/bin/postmaster -p 5432 -D /var/lib/pgsql/data
postgres  3941  0.0  0.0  13056   460 ?        Ss   Apr05   0:11
postgres: logger process
postgres  3944  0.0  8.4 152192 87196 ?        Ss   Apr05   1:35
postgres: writer process
postgres  3945  0.0  0.0 152192   684 ?        Ss   Apr05   0:10
postgres: wal writer process
postgres  3946  0.0  0.1 152980  1380 ?        Ss   Apr05  29:13
postgres: autovacuum launcher process
postgres  3947  0.1  0.0  13916  1020 ?        Ss   Apr05 118:23
postgres: stats collector process


so there's one connection there, and the others are the fixed processes.

John R Pierce wrote:
> Whit Armstrong wrote:
>> anyone know a way to get nagios to monitor the number of postgres
>> connections?
>>
>

Check out the check_postgres nagios plugin:
http://bucardo.org/check_postgres/

Specifically you want the backends check:
http://bucardo.org/check_postgres/check_postgres.pl.html#backends


--
Jeff Frost, Owner     <jeff@frostconsultingllc.com>
Frost Consulting, LLC     http://www.frostconsultingllc.com/
Phone: 916-647-6411    FAX: 916-405-4032

Whit Armstrong wrote:
> anyone know a way to get nagios to monitor the number of postgres connections?
>
> Thanks,
> Whit
>

Hello

We use this plugin. Save it under /etc/munin/plugins/pg_connections and
update the file /etc/munin/plugin-conf.d/postgres with:

-------------------
[pg_connection]
     user postgres
-------------------

-------------------------------------------------
#!/bin/sh
#
# Plugin to monitor PostgreSQL connections.
#
# Parameters:
#
#       config   (required)
#       autoconf (optional - only used by munin-config)
#
# Magic markers (optional - used by munin-config and some installation
# scripts):
#%# family=auto
#%# capabilities=autoconf

PID_FILE="/var/lib/pgsql/data/postmaster.pid"

if [ "$1" = "autoconf" ]; then
  if [  -f $PID_FILE ]; then
    echo yes
    exit 0
  else
    echo "no (Service not running)"
    exit 1
  fi
else
  if [ "$1" = "suggest" ]; then
    ls -1 /tmp/
    exit 0
  fi
fi


if [ "$1" = "config" ]; then

        echo "graph_title Number of connections to the database"
        echo 'graph_args -l 0 '
        echo 'graph_vlabel Number of PostgreSQL connections'
        echo 'graph_category PostgreSQL'
        echo 'graph_period second'
        echo 'graph_info The number of opened connections to PostgreSQL.'
        echo 'established.label established'
        echo 'established.type GAUGE'
        echo 'established.max 500'
        echo 'established.info The number of currently open connections.'
        exit 0
fi

printf 'established.value '
/usr/bin/psql template1 -At -c "SELECT count(*) FROM pg_stat_activity"
-------------------------------------------------

PS.- You have to update the PATHS with the values in your system, and
the  user postgres needs access to your database, for this plugin to work.

regards,
--
 Rafael Martinez, <r.m.guerrero@usit.uio.no>
 Center for Information Technology Services
 University of Oslo, Norway

 PGP Public Key: http://folk.uio.no/rafael/

Rafael Martinez wrote:
> Whit Armstrong wrote:
>> anyone know a way to get nagios to monitor the number of postgres connections?
>>
>> Thanks,
>> Whit
>>
>
> Hello
>
> We use this plugin. Save it under /etc/munin/plugins/pg_connections and
> update the file /etc/munin/plugin-conf.d/postgres with:
>

And of course this is for munin and not nagios. Sorry.

--
 Rafael Martinez, <r.m.guerrero@usit.uio.no>
 Center for Information Technology Services
 University of Oslo, Norway

 PGP Public Key: http://folk.uio.no/rafael/