168 lines
5.6 KiB
ReStructuredText
168 lines
5.6 KiB
ReStructuredText
:title: Puppet Master
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.. _puppet-master:
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Puppet Master
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#############
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Puppet agent is a mechanism use to pull puppet manifests and configuration
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from a centralized master. This means there is only one place that needs to
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hold secure information such as passwords, and only one location for the git
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repo holding the modules.
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At a Glance
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===========
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:Hosts:
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* puppetmaster.openstack.org
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:Puppet:
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* :file:`modules/openstack_project/manifests/puppetmaster.pp`
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:Projects:
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* https://puppetlabs.com/
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:Bugs:
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* http://bugs.launchpad.net/openstack-ci
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* http://projects.puppetlabs.com/
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:Resources:
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* `Puppet Language Reference <http://docs.puppetlabs.com/references/2.7.latest/type.html>`_
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Puppet Master
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-------------
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The puppet master is setup using a combination of Apache and mod passenger to
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ship the data to the clients.
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The cron jobs, current configuration files and more can be done with ``puppet
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apply`` but first some bootstrapping needs to be done.
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First want to install these from puppetlabs' apt repo. We have not yet migrated
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to puppet 3, so we pin puppet to 2.x. There is a script in the root of the
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config repository that will setup appropriate pinning and install the puppet
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client. After that installing the puppetmaster and hiera (used to maintain
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secrets on the puppet master).
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Please note: Fedora F19 and Ubuntu Raring and above cannot successfully run an
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OpenStack-CI puppetmaster due to new Ruby and older Puppet not being
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compatible, so be sure to use an older release - e.g. Ubuntu Precise.
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.. code-block:: bash
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sudo su -
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git clone https://git.openstack.org/openstack-infra/config /opt/config/production
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/opt/config/production/install_puppet.sh
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apt-get install puppetmaster-passenger hiera hiera-puppet
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Finally, install the modules, fix your hostname and use ``puppet apply`` to
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finish configuration:
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.. code-block:: bash
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bash /opt/config/production/install_modules.sh
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echo $REAL_HOSTNAME > /etc/hostname
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service hostname restart
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puppet apply --modulepath='/opt/config/production/modules:/etc/puppet/modules' -e 'include openstack_project::puppetmaster'
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Note: Hiera uses a systemwide configuration file in ``/etc/puppet/hiera.yaml``
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and this setup supports multiple configurations. The two sets of environments
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that OpenStack Infrastructure uses are ``production`` and ``development``.
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``production`` is the default is and the environment used when nothing else is
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specified. Then the configuration needs to be placed into common.yaml in
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``/etc/puppet/hieradata/production`` and ``/etc/puppet/hieradata/development``.
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The values are simple key-value pairs in yaml format. The keys needed are the
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keys referenced in your ``site.pp``, their values are typically obvious
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(strings, lists of strings). ``/etc/puppet/hieradata/`` and below should be
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owned by ``puppet:puppet`` and have mode ``0711``. The actual ``common.yaml``
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file should have mode 0600.
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Adding a node
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-------------
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On the new server connecting (for example, review.openstack.org) to
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the puppet master:
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.. code-block:: bash
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sudo apt-get install puppet
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The node then needs to be configured to set a fixed hostname and the
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hostname of the puppet master with the following additions to
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``/etc/puppet/puppet.conf``:
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.. code-block:: ini
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[main]
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server=puppetmaster.openstack.org
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certname=review.openstack.org
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The cert signing process needs to be started with:
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.. code-block:: bash
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sudo puppet agent --test
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This will make a request to the puppet master to have its SSL cert signed.
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On the puppet master:
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.. code-block:: bash
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sudo puppet cert list
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You should get a list of entries similar to the one below::
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review.openstack.org (44:18:BB:DF:08:50:62:70:17:07:82:1F:D5:70:0E:BF)
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If you see the new node there you can sign its cert on the puppet master with:
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.. code-block:: bash
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sudo puppet cert sign review.openstack.org
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Once the cert is signed, the puppet running orchestration will pick up
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the node and run puppet on it as needed.
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Running Puppet on Nodes
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-----------------------
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In OpenStack's Infrastructure, puppet runs are triggered from a cronjob
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running on the puppetmaster which in turn runs a single run of puppet on
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each host we know about. We do not use the daemon mode of puppet agent
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because it experiences random hangs, and also does not allow us to control
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sequencing in any meaningful way.
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The entry point for this process is ``/opt/config/production/run_all.sh``
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There are a set of nodes, which are configured in puppet as "override" nodes,
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which are run in sequence before the rest of the nodes are run in parallel.
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At the moment, this allows creation of git repos on the git slaves before
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creation of the master repos on the gerrit server.
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Disabling Puppet on Nodes
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-------------------------
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In the case of needing to disable the running of puppet on a node, it's a
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simple matter of disabling the agent:
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.. code-block:: bash
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sudo puppet agent --disable
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This will prevent any subsequent runs of the agent, including ones triggered
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globally by the run_all script. If, as an admin, you need to run puppet on
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a node where it has been disabled, you need to specify an alternate disable
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lock file which will allow your local run of puppet without allowing the
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globally orchestrated runs to occur:
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.. code-block:: bash
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sudo puppet agent --test --puppetdlockfile=/tmp/alt-lock-file
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Important Notes
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---------------
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#. Make sure the site manifest **does not** include the puppet cron job, this
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conflicts with puppet master and can cause issues. The initial puppet run
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that create users should be done using the puppet agent configuration above.
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#. If you do not see the cert in the master's cert list the agent's
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``/var/log/syslog`` should have an entry showing you why.
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