opendev/system-config
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system-config/doc/source/puppet.rst
Robert Collins 2bfb9144f2 Document setting the correct hostname. 
Puppetmaster bringup will often have the wrong hostname in a cloud
(e.g. a uuid or the shortname given to nova). But if it's wrong the
puppetmaster CA created by the puppetmaster module will be broken.

Additional nodes can have this handled by automation, but the
puppetmaster is special - this is part of the bootstrap process.

Change-Id: I8e0e2ea4a5d27fb248b88d6be57abb171d81f13f
2013-08-31 09:54:09 +12:00

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title

Puppet Master

Puppet Master

Puppet agent is a mechanism use to pull puppet manifests and configuration from a centralized master. This means there is only one place that needs to hold secure information such as passwords, and only one location for the git repo holding the modules.

At a Glance

Hosts
Puppet
  • modules/openstack_project/manifests/puppetmaster.pp
Projects
Bugs
Resources

Puppet Master

The puppet master is setup using a combination of Apache and mod passenger to ship the data to the clients.

The cron jobs, current configuration files and more can be done with puppet apply but first some bootstrapping needs to be done.

First want to install these from puppetlabs' apt repo. We have not yet migrated to puppet 3, so we pin puppet to 2.x. There is a script in the root of the config repository that will setup appropriate pinning and install the puppet client. After that installing the puppetmaster and hiera (used to maintain secrets on the puppet master).

Please note: Fedora F19 and Ubuntu Raring and above cannot successfully run an OpenStack-CI puppetmaster due to new Ruby and older Puppet not being compatible, so be sure to use an older release - e.g. Ubuntu Precise.

sudo su -
git clone https://git.openstack.org/openstack-infra/config /opt/config/production
/opt/config/production/install_puppet.sh
apt-get install puppetmaster-passenger hiera hiera-puppet

Finally, install the modules, fix your hostname and use puppet apply to finish configuration:

bash /opt/config/production/install_modules.sh
echo $REAL_HOSTNAME > /etc/hostname
service hostname restart
puppet apply --modulepath='/opt/config/production/modules:/etc/puppet/modules' -e 'include openstack_project::puppetmaster'

Note: Hiera uses a systemwide configuration file in /etc/puppet/hiera.yaml and this setup supports multiple configurations. The two sets of environments that OpenStack Infrastructure uses are production and development. production is the default is and the environment used when nothing else is specified. Then the configuration needs to be placed into common.yaml in /etc/puppet/hieradata/production and /etc/puppet/hieradata/development. The values are simple key-value pairs in yaml format. The keys needed are the keys referenced in your site.pp, their values are typically obvious (strings, lists of strings). /etc/puppet/hieradata/ and below should be owned by puppet:puppet and have mode 0711. The actual common.yaml file should have mode 0600.

Adding a node

On the new server connecting (for example, review.openstack.org) to the puppet master:

sudo apt-get install puppet

Then edit the /etc/default/puppet file to change the start variable:

# Start puppet on boot?
START=yes

The node then needs to be configured to set a fixed hostname and the hostname of the puppet master with the following additions to /etc/puppet/puppet.conf:

[main]
server=ci-puppetmaster.openstack.org
certname=review.openstack.org

The cert signing process needs to be started with:

sudo puppet agent --test

This will make a request to the puppet master to have its SSL cert signed. On the puppet master:

sudo puppet cert list

You should get a list of entries similar to the one below:

review.openstack.org  (44:18:BB:DF:08:50:62:70:17:07:82:1F:D5:70:0E:BF)

If you see the new node there you can sign its cert on the puppet master with:

sudo puppet cert sign review.openstack.org

Finally on the puppet agent you need to start the agent daemon:

sudo service puppet start

Now that it is signed the puppet agent will execute any instructions for its node on the next run (default is every 30 minutes). You can trigger this earlier by restarting the puppet service on the agent node.

Important Notes

  1. Make sure the site manifest does not include the puppet cron job, this conflicts with puppet master and can cause issues. The initial puppet run that create users should be done using the puppet agent configuration above.
  2. If you do not see the cert in the master's cert list the agent's /var/log/syslog should have an entry showing you why.