CentOS - Nov 2014 - automated smtp server check

I would like to set up a cron job to automatically check whether my mailserver
and webserver are up, and tell me if they're not.

This script tells me if my webserver is up:

#!/bin/bash
wget -q --tries=10 --timeout=20 --spider http://melvilletheatre.com
if [[ $? -eq 0 ]]; then
        echo "Online"
else
        echo "Offline"
fi

How can I do the something similar with my mailserver?

Or if someone knows of an integrated tool that will monitor this in a better way
(whatever that may be), I'm more than interested.

-- 
MELVILLE THEATRE ~ Real D 3D Digital Cinema ~ www.melvilletheatre.com

On 11/4/2014 11:36 AM, Frank Cox wrote:
> Or if someone knows of an integrated tool that will monitor this in a
better way (whatever that may be), I'm more than interested.
Nagios.



-- 
john r pierce                                      37N 122W
somewhere on the middle of the left coast

El 04/11/14 a las 20:36, Frank Cox escribi?:
> I would like to set up a cron job to automatically check whether my
mailserver and webserver are up, and tell me if they're not.
>
> This script tells me if my webserver is up:
>
> #!/bin/bash
> wget -q --tries=10 --timeout=20 --spider http://melvilletheatre.com
> if [[ $? -eq 0 ]]; then
>          echo "Online"
> else
>          echo "Offline"
> fi
>
> How can I do the something similar with my mailserver?
>
> Or if someone knows of an integrated tool that will monitor this in a
better way (whatever that may be), I'm more than interested.
>
Hello

I use Nmap to test if a server up in a port:

$ nmap -p587 a.mail.server |grep -i 587

587/tcp open  submission

Or several ports:

$ nmap -p25,143,587 a.mail.server |grep -i open
25/tcp  open  smtp
143/tcp open  imap
587/tcp open  submission

If the server is working, the port is shown as open. You can parse it as 
desired to message you as you want

Best

On Tue, Nov 4, 2014 at 1:36 PM, Frank Cox <theatre at melvilletheatre.com>
wrote:
> >
> Or if someone knows of an integrated tool that will monitor this in a
better way (whatever that may be), I'm more than interested.
>
Overkill for one or a few sites, but:
http://www.opennms.org/
can monitor most network services with a framework for alarms and
notifications, plus keeping nice graph histories of snmp data
(interface traffic, cpu/disk/memory use, etc.

-- 
   Les Mikesell
     lesmikesell at gmail.com

Am 04.11.2014 um 20:36 schrieb Frank Cox <theatre at
melvilletheatre.com>:
> I would like to set up a cron job to automatically check whether my
mailserver and webserver are up, and tell me if they're not.
> 
> This script tells me if my webserver is up:
> 
> #!/bin/bash
> wget -q --tries=10 --timeout=20 --spider http://melvilletheatre.com
> if [[ $? -eq 0 ]]; then
>        echo "Online"
> else
>        echo "Offline"
> fi
> 
> How can I do the something similar with my mailserver?
> 
> Or if someone knows of an integrated tool that will monitor this in a
better way (whatever that may be), I'm more than interested.


mon - old lady but small:

$ yum -y install epel-release ; yum install mon

$ rpm -qi mon |grep -E 'Size|Summary'
Size        : 1155876                          
Summary     : General-purpose resource monitoring system

$ rpm -ql mon | grep -E 'http|imap|smtp|pop&or$'
/usr/lib64/mon/mon.d/http.monitor
/usr/lib64/mon/mon.d/http_tppnp.monitor
/usr/lib64/mon/mon.d/imap.monitor
/usr/lib64/mon/mon.d/phttp.monitor
/usr/lib64/mon/mon.d/smtp.monitor
/usr/lib64/mon/mon.d/smtp3.monitor

$ vi /etc/mon/mon.cf

$ service mon start

$ monshow


and if you like (on EL{5,6}):

$ chkconfig mon on 


--
LF

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

It could be done using a crontab job and it's very efficient sometimes
to use only a crontab job instead of nagios.

You can use the precompiled nagios scripts for the task.
Unless you have constrains on the OS allowed languages and packages,
which then should be evaluated more deeply to meet your needs which
might be missing.

So:
- - Nagios scripts as crontab job
- - Other tcp level scripts as a crontab job
- - fully fledged nagios
- - other relevant solutions in your scope

Eliezer

On 11/04/2014 09:36 PM, Frank Cox wrote:
> I would like to set up a cron job to automatically check whether my
> mailserver and webserver are up, and tell me if they're not.
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On 11/4/2014 2:36 PM, Frank Cox wrote:
> I would like to set up a cron job to automatically check whether my
mailserver and webserver are up, and tell me if they're not.
> 
> This script tells me if my webserver is up:
...
> How can I do the something similar with my mailserver?
How about a cron job that e-mails you the output of 'service httpd
status' or equivalent?  You'll get a message that tells you if your web
server is up or not.  If you don't get a message, your mail server is down! 
(HHOS.)

Unless you're just collecting performance or availability metrics for
reports, how you intend to be notified is something to consider.  It's
trivial to have a web server's failing check result e-mailed to you, but you
need an out-of-band notification method (an old Nokia phone attached to the
serial port that emits an SMS message, for example) if your mail server is
having difficulty.

-- 
-Chris