On Tue, Apr 25, 2017 at 10:27:43AM +0200, Jehan-Guillaume de Rorthais wrote: > On Tue, 25 Apr 2017 10:02:21 +0200 > Lars Ellenberg <lars.ellenb...@linbit.com> wrote: > > > On Mon, Apr 24, 2017 at 03:08:55PM -0500, Ken Gaillot wrote: > > > 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. > > > > > > I seem to remember that at some deployment, > > we set the node instance attribute standby=on, always, > > and took it out of standby using the node_state transient_attribute :-) > > > > As in > > # crm node standby ava > > <node id="1" uname="ava"> > > <instance_attributes id="nodes-1"> > > <nvpair id="nodes-1-standby" name="standby" value="on"/> > > ... > > </instance_attributes> > > </node> > > ... > > This solution seems much more elegant and obvious to me. A cli > (crm_standby?) interface would be ideal. > > It feels weird to mix setup interfaces (through crm_standby or through the > config file) to manipulate the same node attribute. Isn't it possible to set > the standby instance attribute of a node **before** it is added to the > cluster? > > > # crm node status-attr ava set standby off > > <node_state id="1" uname="ava" in_ccm="true" crmd="online" > > crm-debug-origin="do_update_resource" join="member" expected="member"> ... > > <transient_attributes id="1"> > > <instance_attributes id="status-1"> > > ... > > <nvpair id="status-1-standby" name="standby" value="off"/> > > </instance_attributes> > > </transient_attributes> > > </node_state> > > It is not really straight forward to understand why you need to edit a second > different nvpair to exit the standby mode... :/
Well, you want the "persistent" setting "on", and override it with a "transient" setting "off". That's how to do it in pacemaker. But yes, what exactly has ever been "obvious" in pacemaker, before you knew? :-) (or HA in general, to be fair) -- : Lars Ellenberg : LINBIT | Keeping the Digital World Running : DRBD -- Heartbeat -- Corosync -- Pacemaker : R&D, Integration, Ops, Consulting, Support DRBD® and LINBIT® are registered trademarks of LINBIT _______________________________________________ Users mailing list: Users@clusterlabs.org http://lists.clusterlabs.org/mailman/listinfo/users Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://bugs.clusterlabs.org
