Pacemaker 2.0 Changes

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Pacemaker 2.0 is a major release whose main goal is to remove support for deprecated legacy syntax, in order to improve code maintainability.

As a result, rolling upgrades from Pacemaker versions earlier than 1.1.11 are not possible, even if the underlying cluster stack is corosync 2 or greater (the only stack supported by both Pacemaker 1 and Pacemaker 2). Rolling upgrades from newer versions on top of corosync 2 or greater should be possible with little to no change.

The changes fall into these categories:

Also, portions of the Pacemaker Explained document were separated into a new document, Pacemaker Administration. Pacemaker Explained now focuses solely on configuration options, while cluster administration tips are in the new document.