I use Nagios a lot. If it’s not for the peace of mind that I know that my, and my clients infrastructure is monitored, its for the obsessive compulsiveness of the statistics. Admittedly, stats-wise I use Munin now, however, for monitoring everything I use Nagios.

One of the awesome things about Nagios is how you can configure it to do various things when an alert is triggered. For me, speed is the key, and with Textlocal’s API, I can get an alert to me within 4 seconds of an issue occurring.

To configure this, we need to set up some commands. The following needs to be added to your Nagios config file which contains commands (for me, it’s called commands.cfg):
define command{
command_name host_notify_with_sms
command_line wget "http://api.txtlocal.com/send/?apikey=<<APIKEY>>&sender=Nagios&numbers=$CONTACTPAGER$&message=$NOTIFICATIONTYPE$%25nHost: $HOSTNAME$ is $HOSTSTATE$%25nTime: $LONGDATETIME$%25n%25n$HOSTOUTPUT$"
define command{
command_name service_notify_with_sms
command_line wget "http://api.txtlocal.com/send/?apikey=<<APIKEY>>&sender=Nagios&numbers=$CONTACTPAGER$&message=$NOTIFICATIONTYPE$%25nService: $SERVICEDESC$ on $HOSTALIAS$%25nState: $SERVICESTATE$%25nTime: $LONGDATETIME$%25n%25n$SERVICEOUTPUT$"

Replacing <<APIKEY>> with an API key generated within Textlocal’s Settings->API Key.

Next, you need to set some additional bits up on the users – you need to specify a contact number and also to tell Nagios to use these new functions for alerts. To do this:

1) For service_notification_commands add the option service_notify_with_sms (space separated)
2) For host_notification_commands add the option host_notify_with_sms (space separated)
3) Add a pager definition which contains the mobile number – e.g. pager 447494000000

Restart Nagios, and job’s done!

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