[ClusterLabs] Coming in Pacemaker 1.1.17: start a node in standby

[Kristoffer Grönlund]

Ken Gaillot <kgaillot at redhat.com> writes:

> Hi all,
>
> Pacemaker 1.1.17 will have a feature that people have occasionally asked
> for in the past: the ability to start a node in standby mode.
>
> It will be controlled by an environment variable (set in
> /etc/sysconfig/pacemaker, /etc/default/pacemaker, or wherever your
> distro puts them):
>
>
> # By default, nodes will join the cluster in an online state when they first
> # start, unless they were previously put into standby mode. If this
> variable is
> # set to "standby" or "online", it will force this node to join in the
> # specified state when starting.
> # (experimental; currently ignored for Pacemaker Remote nodes)
> # PCMK_node_start_state=default
>
>
> As described, it will be considered experimental in this release, mainly
> because it doesn't work with Pacemaker Remote nodes yet. However, I
> don't expect any problems using it with cluster nodes.
>
> Example use cases:
>
> You want want fenced nodes to automatically start the cluster after a
> reboot, so they contribute to quorum, but not run any resources, so the
> problem can be investigated. You would leave
> PCMK_node_start_state=standby permanently.
>
> You want to ensure a newly added node joins the cluster without problems
> before allowing it to run resources. You would set this to "standby"
> when deploying the node, and remove the setting once you're satisfied
> with the node, so it can run resources at future reboots.
>
> You want a standby setting to last only until the next boot. You would
> set this permanently to "online", and any manual setting of standby mode
> would be overwritten at the next boot.
>
> Many thanks to developers Alexandra Zhuravleva and Sergey Mishin, who
> contributed this feature as part of a project with EMC.

One of those features that seem obvious in retrospect. Great addition,
thanks to everyone involved!

Cheers,
Kristoffer

> -- 
> Ken Gaillot <kgaillot at redhat.com>
>
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-- 
// Kristoffer Grönlund
// kgronlund at suse.com