[Pacemaker] Stopping/restarting pacemaker without stopping resources?

[Andrew Beekhof]

> On 16 Oct 2014, at 9:31 pm, Andrei Borzenkov <arvidjaar at gmail.com> wrote:
> 
> The primary goal is to transparently update software in cluster. I
> just did HA suite update using simple RPM and observed that RPM
> attempts to restart stack (rcopenais try-restart). So
> 
> a) if it worked, it would mean resources had been migrated from this
> node - interruption
> 
> b) it did not work - apparently new versions of installed utils were
> incompatible with running pacemaker so request to shutdown crm fails
> and openais hung forever.
> 
> The usual workflow with one cluster products I worked before was -
> stop cluster processes without stopping resources; update; restart
> cluster processes. They would detect that resources are started and
> return to the same state as before stopping. Is something like this
> possible with pacemaker?

absolutely.  this should be of some help:

http://clusterlabs.org/doc/en-US/Pacemaker/1.1/html/Pacemaker_Explained/_disconnect_and_reattach.html

> 
> TIA
> 
> -andrei
> 
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