[Pacemaker] primary does not run alone

[Lars Ellenberg]

On Tue, Oct 11, 2011 at 09:09:52AM +0900, H.Nakai wrote:
> Hi, Andreas, Lars, and everybody
> 
> I will try newer version.
> 
> But, I want below.

DRBD has fencing policies (fencing resource-and-stonith, for example),
which, if configured, cause it to call fencing handlers (handler { fence-peer .... })
when appropriate.

There are various fence-peer handlers.
 One is the "drbd-peer-outdater",
which needs dopd, which at this point depends on the heartbeat
communication layer.

Then there is the crm-fence-peer.sh script,
which works by setting a pacemaker location constraint instead of
actually setting the peer outdated.

See if that works like you think it should.

> Primary
>   demote
>   wait 5-10 seconds
>   check Secondary is promoted or
>     still secondary or disconnected
>   if Secondary is promoted and still primary,
>    set local "outdate"
>   (This means shutdown only Primary)
>   if Secondary is still secondary or disconnected,
>     not set local "outdate"
>   (This means shutdown both of Primary and Secondary)
>   disconnect
>   shutdown
> Seconday
>   check Primary
>   if Primary is primary, set local "outdate"
>   if Primary is demoted(secondary), not set "outdate"
>   disconnect
>   shutdown
> 
> (2011/10/08 7:14), Lars Ellenberg wrote:
> > On Fri, Oct 07, 2011 at 11:29:57PM +0200, Andreas Kurz wrote:
> >> Hello,
> >> 
> >> On 10/07/2011 04:51 AM, H.Nakai wrote:
> >> > Hi, I'm from Japan, in trouble.
> >> > In the case blow, server which was primary
> >> > sometimes do not run drbd/heartbeat.
> >> > 
> >> > Server A(primary), Server B(secondary) is running.
> >> > Shutdown A and immediately Shutdown B.
> >> > Switch on only A, it dose not run drbd/heartbeat.
> >> > 
> >> > It may happen when one server was broken.
> >> > 
> >> > I'm using,
> >> > drbd83-8.3.8-1.el5
> >> > heartbeat-3.0.5-1.1.el5
> >> > pacemaker-1.0.11-1.2.el5
> >> > resource-agents-3.9.2-1.1.el5
> >> > centos5.6
> >> > Servers are using two LANs(eth0, eth1) and not using serial cable.
> >> > 
> >> > I checked /usr/lib/ocf/resource.d/linbit/drbd,
> >> > and insert some debug codes.
> >> > At drbd_stop(), in while loop,
> >> > only when "Unconfigured", break and call maybe_outdate_self().
> >> > But sometimes, $OCF_RESKEY_CRM_meta_notify_master_uname or
> >> > $OCF_RESKEY_CRM_meta_notify_promote_uname are not null.
> >> > So, at maybe_outdate_self(), it is going to set "outdate".
> >> > And, it always show warning messages below. But, "outdated" flag is set.
> >> > "State change failed: Disk state is lower than outdated"
> >> > " state = { cs:StandAlone ro:Secondary/Unknown ds:Diskless/DUnknown r--- }"
> >> > "wanted = { cs:StandAlone ro:Secondary/Unknown ds:Outdated/DUnknown r--- }"
> > 
> > those are expected and harmless, even though I admit they are annoying.
> > 
> >> > I do not want to be set outdated flag, when shutdown both of them.
> >> > I want to know what program set $OCF_RESKEY_CRM_* variables,
> >> > with what condition set these variables,
> >> > and when these variables are set.
> >> 
> >> you need a newer OCF resource agent, at least from DRBD 8.3.9. There was
> >> the new parameter "stop_outdates_secondary" (defaults to true)
> >> introduced ... set this to false to change the behavior of your setup
> >> and be warned: this increases the change to come up with old (outdated)
> >> data.
> > 
> > BTW, that default has changed to false,
> > because of a bug in some version of pacemaker,
> > which got the environment for stop operations wrong.
> > pacemaker 1.0.11 is ok again, iirc.
> > 
> > Anyways, if you simply go to DRBD 8.3.11, you should be good.
> > If you want only the agent script, grab it there:
> > http://git.drbd.org/drbd-8.3.git/?a=blob_plain;f=scripts/drbd.ocf
> > 
> 
> Thanks,
> 
> Nickey
> 
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-- 
: Lars Ellenberg
: LINBIT | Your Way to High Availability
: DRBD/HA support and consulting http://www.linbit.com

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