[ClusterLabs] Pacemaker 1.1.16 released

[Ken Gaillot]

ClusterLabs is proud to announce the latest release of the Pacemaker
cluster resource manager, version 1.1.15. The source code is available at:

https://github.com/ClusterLabs/pacemaker/releases/tag/Pacemaker-1.1.16
The most significant enhancements in this release are:

* rsc-pattern may now be used instead of rsc in location constraints, to
allow a single location constraint to apply to all resources whose names
match a regular expression. Sed-like %0 - %9 backreferences let
submatches be used in node attribute names in rules.

* The new ocf:pacemaker:attribute resource agent sets a node attribute
according to whether the resource is running or stopped. This may be
useful in combination with attribute-based rules to model dependencies
that simple constraints can't handle.

* Pacemaker's existing "node health" feature allows resources to move
off nodes that become unhealthy. Now, when using
node-health-strategy=progressive, a new cluster property
node-health-base will be used as the initial health score of newly
joined nodes (defaulting to 0, which is the previous behavior). This
allows a node to be treated as "healthy" even if it has some "yellow"
health attributes, which can be useful to allow clones to run on such nodes.

* Previously, the OCF_RESKEY_CRM_meta_notify_active_* variables were not
properly passed to multistate resources with notification enabled. This
has been fixed. To help resource agents detect when the fix is
available, the CRM feature set has been incremented. (Whenever the
feature set changes, mixed-version clusters are supported only during
rolling upgrades -- nodes with an older version will not be allowed to
rejoin once they shut down.)

* Watchdog-based fencing using sbd now works better on remote nodes.
This capability still likely has some limitations, however.

* The build process now takes advantage of various compiler features
(RELRO, PIE, as-needed linking, etc.) that enhance security and start-up
performance. See the "Hardening flags" comments in the configure.ac file
for more details.

* Python 3 compatibility: The Pacemaker project now targets
compatibility with both python 2 (versions 2.6 and later) and python 3
(versions 3.2 and later). All of the project's python code now meets
this target, with the exception of CTS, which is still python 2 only.

* The Pacemaker coding guidelines have been replaced by a more
comprehensive addition to the documentation set, "Pacemaker
Development". It is intended for developers working on the Pacemaker
code base itself, rather than external code such as resource agents. A
copy is viewable at
http://clusterlabs.org/doc/en-US/Pacemaker/1.1-pcs/html-single/Pacemaker_Development/

As usual, the release includes many bugfixes, including a fix for a
serious security vulnerability (CVE-2016-7035). For a more detailed list
of changes, see the change log:

https://github.com/ClusterLabs/pacemaker/blob/1.1/ChangeLog

Many thanks to all contributors of source code to this release,
including Andrew Beekhof, Bin Liu, Christian Schneider, Christoph Berg,
David Shane Holden, Ferenc Wágner, Yan Gao, Hideo Yamauchi, Jan Pokorný,
Ken Gaillot, Klaus Wenninger, Kostiantyn Ponomarenko, Kristoffer
Grönlund, Lars Ellenberg, Masatake Yamato, Michal Koutný, Nakahira
Kazutomo, Nate Clark, Nishanth Aravamudan, Oyvind Albrigtsen, Ruben
Kerkhof, Tim Bishop, Vladislav Bogdanov and Yusuke Iida. Apologies if I
have overlooked anyone.
-- 
Ken Gaillot <kgaillot at redhat.com>