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Nagios is one of the leading providers of open source, enterprise-grade IT infrastructure monitoring tools. Used by hundreds of thousands of users worldwide, Nagios allows its users to monitor their entire IT infrastructure, spot problems before they occur, detect security breaches and plan/budget for IT upgrades.
By integrating PagerDuty into your existing Nagios monitoring solution, you can have Nagios alerts go directly to the the person on-call in your PagerDuty schedule. The benefit of the two-way integration is that users can acknowledge an incident in PagerDuty and the acknowledgment will be passed on to the relevant service or host in Nagios, meaning both systems will reflect the most current status of an issue.
The guide below describes how to integrate your Nagios 2, 3 or 4 installation with PagerDuty using our easy to install agent. Note that you must be logged in as root to complete the installation. You might need to slightly alter these instructions depending on your exact Linux distribution, Nagios configuration and Nagios version. Please contact our support team if you have any trouble completing the integration.
Note: If you are running Nagios on CentOS 5, you will need to use the Perl-based integration for Nagios instead of following this guide.
This guide includes steps for Nagios as installed from readymade packages via apt-get (Debian-based, i.e. Ubuntu) and yum (RHEL-based, i.e. CentOS, Fedora) Linux package managers, as well as for systems on which Nagios has been installed from source (“source installations”). You do not need to execute all commands in this guide, only the ones for your type of system. Note that all commands provided are intended to be run as the root user.
mv pagerduty_nagios.cfg /etc/nagios3/conf.d
For RHEL-based systems this is usually /etc/nagios:
mv pagerduty_nagios.cfg /etc/nagios
For source installations, move the file to /usr/local/nagios/etc/objects:
mv pagerduty_nagios.cfg /usr/local/nagios/etc/objects
If using a source installation, add this line to the main config file at /usr/local/nagios/etc/nagios.cfg
alias Nagios Administrators
members root,pagerduty ; Add pagerduty here
service nagios3 restart
service nagios restart
grep "^command_file" /etc/nagios3/nagios.cfg
grep "^command_file" /etc/nagios/nagios.cfg
mv pagerduty.cgi /usr/lib/cgi-bin/nagios3/
For RHEL-based systems this is usually /usr/lib64/nagios/cgi/:
mv pagerduty.cgi /usr/lib64/nagios/cgi/
chmod +x /usr/lib/cgi-bin/nagios3/pagerduty.cgi
For RHEL-based systems:
chmod +x /usr/lib64/nagios/cgi/pagerduty.cgi
apt-get install libwww-perl libjson-perl
For Ubuntu 16.04 systems, you will also need to install libcgi-pm-perl:
apt-get install libwww-perl libjson-perl libcgi-pm-perl
yum install perl-JSON perl-CGI perl-libwww-perl
/etc/init.d/nagios3 stop ## Note: This will stop your Nagios service!
dpkg-statoverride --update --add nagios www-data 2730 /var/lib/nagios3/rw
dpkg-statoverride --update --add nagios nagios 751 /var/lib/nagios3
For the Extension Type select Nagios, then enter in a Name for your webhook, select a Service, paste in the URL, the Username, the Password, and click Save. The URL will look similar to this: http://ip-or-domain/nagios3/cgi-bin/pagerduty.cgi Note: Unless you’ve disabled it, the Nagios web interface requires a username and password. We highly recommend configuring a user that is able to run Nagios commands that is only used for the webhook.
If you go to this URL in your browser you should see 400 Requests must be POSTs. If you do not see this, check your web server logs for details on what happened when you tried to call this URL.
400 Requests must be POSTs
The two-way integration requires that your Nagios server be accessible over the internet to receive webhook calls from PagerDuty. If you wish to restrict access to your Nagios web server to specific IPs, you can find PagerDuty’s webhook IPs in our knowledge base: What are PagerDuty’s IPs for whitelisting and firewall purposes?
Alternatively, you can use a service like ngrok to create a secure tunnel to your Nagios server with a public URL that can be used for your webhook or the poller script originally developed by Zoosk and now maintained by PagerDuty to reach out instead of having your Nagios server publicly accessible.
This is easy to do with the current integration, as a Nagios service in PagerDuty is directly mapped to a “contact” in Nagios. By default, this contact is named pagerduty and defined in the pagerduty_nagios.cfg file. In order to configure multiple services, just duplicate the existing contact definition and rename it (i.e. pagerduty_database, pagerduty_network, etc.). Then copy and paste the corresponding Integration Key from PagerDuty into the pager field. Don’t forget to restart your Nagios for the changes to take effect.
If a PagerDuty server can’t be reached for any reason, events will be stored to an on-disk queue. The PagerDuty agent will attempt to re-send the events when connectivity is restored.
You should configure an external ping check service such as StatusCake or NodePing to monitor your site’s external connectivity. Of course, you can use PagerDuty to receive alerts from these services as well.
First, make sure you’ve installed the PagerDuty Agent, and that there were no errors from your package manager when attempting to install it. Failed installs (i.e. due to an incompatible distribution, such as CentOS 5) are the most common issue with the integration not working.
Check that the pagerduty contact is getting the HOST or SERVICE NOTIFICATIONS in syslog. You can grep your syslog to see if the pagerduty contact is being notified. Here’s an example from an Ubuntu system (on RHEL-based systems, syslog is at /var/log/messages):
grep NOTIFICATION /var/log/syslog
May 28 18:20:57 ip-10-11-139-249 nagios3: SERVICE NOTIFICATION: pagerduty;localhost;Current Users;CRITICAL;notify-service-by-pagerduty;USERS CRITICAL - 3 users currently logged in
As you can see, the pagerduty contact was notified for this SERVICE NOTIFICATION. If the pagerduty contact never shows up, that means that the pagerduty contact is not associated with notifications for the host/service in question. If you’re using the default configuration, make sure that the pagerduty contact is a member of the admins contact group. If the pagerduty contact is getting notified, check the agent log at /var/log/pdagent/pdagentd.log.
More troubleshooting tips can be found in our Nagios Troubleshooting Guide.
PagerDuty can process PROBLEM, ACKNOWLEDGEMENT, and RECOVERY messages. All other messages, including FLAPPINGSTART and FLAPPINGSTOP, are ignored.
We have a guide for Customizing Notifications Sent to PagerDuty from Nagios to help you get started.
Nagios does not send notifications for when a state escalates to from warning to critical. There is a patch to address this issue, which can be found here.
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