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Nagios Slack messages

By on February 10, 2017 in Technology with No Comments

Configure your Nagios server to post alerts in your Slack channel. Having Nagios alerts come in via Slack is faster than getting Nagios alerts via email.
If you want your Slack messages formatted so they look better in your channel replace the SLACK_MESSAGE variable in the script with the line below.
Place the following bash script in the following directory /usr/local/nagios/libexec/slack-msg on your Nagios server.


function post_to_slack () {
  # format message as a code block

  case "$2" in

    curl -s -X POST --data "payload={\"text\": \"${SLACK_ICON} ${SLACK_MESSAGE}\"}" ${SLACK_URL}

post_to_slack "$1" "$2"

exit 0

Next place the following command in your Nagios command directory. I have it setup here /usr/local/nagios/etc/objects/commands/check-notify-slack-cmd.cfg

define command{
	command_name 	slack-msg

Finally add an event hanlder line to your service file that will use the slack-msg command.
event_handler slack-msg
The following is an example of a nrpe disk check service file for Nagios where I have added an event handler for slack. The path is /usr/local/nagios/etc/objects/services/check-nrpe-disk-svc.cfg:

define service {
        use                             generic-service
        hostgroup                       prod-servers
        register                        1
        service_description             DISK::SPACE
        is_volatile                     0
        check_period                    24x7
        max_check_attempts              3
        normal_check_interval           11
        retry_check_interval            11
        contact_groups                  systems,NOC
        notification_interval           31
        notification_period             24x7
        notification_options            c,u,r
        notes_url                       http://confluence.abc.com:8090/display/NOC/Server+Alerts
        event_handler                   slack-msg
        check_command                   check_nrpe!check_disk

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