:title: Puppet Master .. _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: * puppetmaster.openstack.org :Puppet: * :file:`modules/openstack_project/manifests/puppetmaster.pp` :Projects: * https://puppetlabs.com/ :Bugs: * https://storyboard.openstack.org/#!/project/748 * https://tickets.puppetlabs.com/ :Resources: * `Puppet Language Reference `_ 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. You want to install these from puppetlabs' apt repo. There is a script in the root of the system-config repository that will setup and install the puppet client. After that you must install the puppetmaster and hiera (used to maintain secrets on the puppet master). Puppet 3 masters can run on Trusty, Precise, and Centos 6. .. code-block:: bash sudo su - git clone https://git.openstack.org/openstack-infra/system-config /opt/system-config/production /opt/system-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: .. code-block:: bash bash /opt/system-config/production/install_modules.sh echo $REAL_HOSTNAME > /etc/hostname service hostname restart puppet apply --modulepath='/opt/system-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: .. code-block:: bash sudo apt-get install puppet 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``: .. code-block:: ini [main] server=puppetmaster.openstack.org certname=review.openstack.org The cert signing process needs to be started with: .. code-block:: bash sudo puppet agent --test This will make a request to the puppet master to have its SSL cert signed. On the puppet master: .. code-block:: bash 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: .. code-block:: bash sudo puppet cert sign review.openstack.org Once the cert is signed, the puppet running orchestration will pick up the node and run puppet on it as needed. Running Puppet on Nodes ----------------------- In OpenStack's Infrastructure, puppet runs are triggered from a cronjob running on the puppetmaster which in turn runs a single run of puppet on each host we know about. We do not use the daemon mode of puppet agent because it experiences random hangs, and also does not allow us to control sequencing in any meaningful way. The entry point for this process is ``/opt/system-config/production/run_all.sh`` There are a set of nodes, which are configured in puppet as "override" nodes, which are run in sequence before the rest of the nodes are run in parallel. At the moment, this allows creation of git repos on the git slaves before creation of the master repos on the gerrit server. Disabling Puppet on Nodes ------------------------- In the case of needing to disable the running of puppet on a node, it's a simple matter of disabling the agent: .. code-block:: bash sudo puppet agent --disable This will prevent any subsequent runs of the agent, including ones triggered globally by the run_all script. If, as an admin, you need to run puppet on a node where it has been disabled, you need to specify an alternate disable lock file which will allow your local run of puppet without allowing the globally orchestrated runs to occur: .. code-block:: bash sudo puppet agent --test --puppetdlockfile=/tmp/alt-lock-file Important Notes --------------- #. 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. #. 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.