Fix lp1934764 - series upgrade order
Closes-Bug: #1934764 Change-Id: I06f72fc03c5a65f89a4b01f783beed4450e502d3
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@ -100,9 +100,13 @@ rabbitmq-server.
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.. important::
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The first machine to be upgraded is always associated with the leader of the
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principal application. Let this machine be called the "principal leader
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machine" and its unit be called the "principal leader unit".
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The first machines to be upgraded are always associated with the non-leaders
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of the principal application. Let these machines be called the "principal
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non-leader machines" and their units the "principal non-leader units".
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The last machine to be upgraded is always associated with the leader
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of the principal application. Let this machine be called the "principal
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leader machine" and its unit the "principal leader unit".
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The steps are as follows:
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@ -114,7 +118,8 @@ The steps are as follows:
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#. Pause the principal non-leader units.
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#. Perform a series upgrade on the principal leader machine.
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#. Perform a series upgrade on one of the (now paused) principal non-leader
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machines:
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#. Disable :ref:`Unattended upgrades <unattended_upgrades>`.
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@ -131,13 +136,17 @@ The steps are as follows:
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#. Reboot.
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#. Invoke the :command:`complete` sub-command.
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#. Repeat step 4 for the remaining principal non-leader machines.
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#. Pause the principal leader unit.
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#. Repeat step 4 but for the principal leader machine.
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#. Set the value of the (application-dependent) ``openstack-origin`` or the
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``source`` configuration option to 'distro' (new operating system).
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#. Invoke the :command:`complete` sub-command on the principal leader machine.
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#. Repeat steps 4 and 6 for the application non-leader machines.
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#. Perform any possible cluster completed upgrade tasks once all machines have
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had their series upgraded.
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