Updating Packages on Overcloud Nodes
====================================

You can update packages on all overcloud nodes  with command::

    openstack overcloud update stack --templates [templates dir] -i overcloud

This command updates the UpdateIdentifier parameter and triggers stack update
operation. If this parameter is set 'yum update' command is executed and each
node. Because running update on all nodes in parallel might be unsafe (an
update of a package might involve restarting a service), the command above
sets breakpoints on each overcloud node so nodes are updated one by one. When
the update is finished on a node the command will prompt for removing
breakpoint on next one.

.. note::
   If you passed any extra environment files when you created the overcloud (for
   instance, in order to configure :doc:`network isolation
   <../advanced_deployment/network_isolation>`), you must pass them again here
   using the ``-e`` or ``--environment-file`` option to avoid making undesired
   changes to the overcloud.

.. note::
   Multiple breakpoints can be removed by specifying list of nodes with a
   regular expression.

.. note::
   Make sure you use `-i` parameter, otherwise update runs on background and
   doesn't prompt for removing of breakpoints.

.. note::
   If the update command is aborted for some reason you can always continue
   in the process by re-running same command.