Monitoring

The basics

  • linode.openhatch.org is the main OpenHatch box, which runs the website.
  • linode2.openhatch.org is the secondary server for OpenHatch. It hosts Nagios!
  • vm3.openhatch.org is a third server, hosted at GPLHost, that runs the Jenkins continuous integration server.
  • The Nagios configuration is owned by a user called nagios on linode2.openhatch.org.

Access

  • We use ssh keys for login.

  • If you want SSH access to that account, file a bug requesting it, and attach an SSH key. You should hear back within 2 days; if you don't hear back by then, try to find paulproteus or jesstess on IRC.

  • Then you can do:

    ssh nagios@linode2.openhatch.org
    
  • You'll know it's working if you are logged in. If you see a "Password:" prompt, then it is not working.

Notifications

Making changes

In brief, here's what you need to know:

  • Edit files in ~nagios/

  • Once you know what changes you want to make, create a local branch with those changes:

    git checkout -b my_changes
    
  • As you make changes, make meaningful commits. Also, tell "git commit" to use your identity:

    git commit --author="Some Body <some.body@example.com>"
    
  • After you have made the changes, ask someone to review them and merge the changes to master.

  • Rationale: If you stick to the above process, it is fairly easy to roll back to the "master" branch of the Nagios configuration.

  • History: We came up with this process during issue332.

Viewing the web interface, and handling the daemon

  • On linode2, ~nagios/secrets/ contains the mailman and Nagios web interface passwords.

  • View the Nagios web interface at http://linode2.openhatch.org/nagios3/

  • To restart the Nagios daemon, run

    sudo /etc/init.d/nagios3 restart
    

In case of emergency

TODOs

  • Send Nagios notifications to IRC (#openhatch-auto?)?
  • Make the Nagios web interface world-viewable.
  • Version the monitoring configurations.
  • Send SMS alerts to people who want them.
  • Add historical trending (Munin)?