[ClusterLabs] Corosync 2.4.0 is available at corosync.org!

[Jan Friesse]

I am pleased to announce the latest release of Corosync
2.4.0 available immediately from our website at
http://build.clusterlabs.org/corosync/releases/.

This release is mostly about long awaited QDevice feature and few rather 
small fixes.

Qdevice is complete rewrite of old cman qdisk using network arbiter 
(instead of disk) so it's very similar to Linux HA quorum daemon/HP 
Serviceguard Quorum Server/...

Qdevice currently consists of two daemons:

- corosync-qdevice is a daemon running on each node of a cluster. It 
provides a configured number of votes to the quorum subsystem based  on 
a third-party arbitrator’s decision. Its primary use is to allow a 
cluster to sustain more node failures than standard quorum rules allow. 
It is recommended  for  clusters  with an even number of nodes and 
highly recommended for 2 node clusters.

- corosync-qnetd is a daemon running outside of the cluster with the 
purpose of providing a vote to the  corosync-qdevice model net. It’s
designed to support multiple clusters and be almost configuration and
state free. New clusters are handled dynamically and  no  configuration
file exists. It’s also able to run as non-root user - which is 
recommended. Connection between the corosync-qdevice model net client 
can be optionally configured with TLS client certificate checking. The 
communication protocol between server and client is designed to be very 
simple and allow backwards compatibility.

To compile corosync-qdevice/corosync-qnetd, configure.sh has to be 
invoked with --enable-qdevices/--enable-qnetd switches.

To find out how to configure qdevice/qnetd take a look to man pages 
corosync-qdevice (8) and corosync-qnetd (8).

Please note that because of required changes in votequorum, 
libvotequorum is no longer binary compatible. This is reason for version 
bump.

Starting with this release 2.3 branch becomes unsupported and officially 
supported Needle is 2.4 branch. Just a note, this doesn't affect support 
of Flatiron where nothing changes and 1.4 branch is still supported.

Changelog for fixes for 2.4.0 (qdevices commits not included):

Ferenc Wágner (8):
       cmap_track_add.3.in: fix typo: bellow -> below
       Fix typo: funtion -> function
       Fix typo: interger -> integer
       Fix typo: Uknown -> Unknown
       Fix typo: aquire -> acquire
       Fix typo: retrive -> retrieve
       Fix typo: alocated -> allocated
       Fix typo: Diabled -> disabled

Jan Friesse (1):
       config: get_cluster_mcast_addr error is not fatal

bliu (1):
       low:typo fix in sam.h

Upgrade is (more than usually) highly recommended.

Thanks/congratulations to all people that contributed to achieve this
great milestone.