[Pacemaker] node status does not change even if pacemakerd dies
emmanuel segura
emi2fast at gmail.com
Wed Jan 9 05:02:15 EST 2013
Hello
Maybe my question is stupid, but are you root when you try to killing the
procs?
Thanks
2013/1/9 Kazunori INOUE <inouekazu at intellilink.co.jp>
> Hi Andrew,
>
> I have another question about this subject.
> Even if pengine, stonithd, and attrd crash after pacemakerd is killed
> (for example, killed by OOM_Killer), node status does not change.
>
> * pseudo testcase
>
> [dev1 ~]$ crm configure show
> node $id="2472913088" dev2
> node $id="2506467520" dev1
> primitive prmDummy ocf:pacemaker:Dummy \
> op monitor on-fail="restart" interval="10s"
> property $id="cib-bootstrap-options" \
> dc-version="1.1.8-d20d06f" \
> cluster-infrastructure="**corosync" \
> no-quorum-policy="ignore" \
> stonith-enabled="false" \
> startup-fencing="false"
> rsc_defaults $id="rsc-options" \
> resource-stickiness="INFINITY" \
> migration-threshold="1"
>
> [dev1 ~]$ pkill -9 pacemakerd
> [dev1 ~]$ pkill -9 pengine
> [dev1 ~]$ pkill -9 stonithd
> [dev1 ~]$ pkill -9 attrd
>
> [dev1 ~]$ ps -ef|egrep 'corosync|pacemaker'
> root 19124 1 0 14:27 ? 00:00:01 corosync
> 496 19144 1 0 14:27 ? 00:00:00 /usr/libexec/pacemaker/cib
> root 19146 1 0 14:27 ? 00:00:00 /usr/libexec/pacemaker/lrmd
> 496 19149 1 0 14:27 ? 00:00:00 /usr/libexec/pacemaker/crmd
>
> [dev1 ~]$ crm_mon -1
> :
> Stack: corosync
> Current DC: dev2 (2472913088) - partition with quorum
> Version: 1.1.8-d20d06f
> 2 Nodes configured, unknown expected votes
> 1 Resources configured.
>
>
> Online: [ dev1 dev2 ]
>
> prmDummy (ocf::pacemaker:Dummy): Started dev1
>
> Node (dev1) remains Online.
> When other processes such as lrmd crash, it becomes "UNCLEAN (offline)".
> Is this a bug? Or specifications?
>
> Best Regards,
> Kazunori INOUE
>
>
> (13.01.08 09:16), Andrew Beekhof wrote:
>
>> On Wed, Dec 19, 2012 at 8:15 PM, Kazunori INOUE
>> <inouekazu at intellilink.co.jp> wrote:
>>
>>> (12.12.13 08:26), Andrew Beekhof wrote:
>>>
>>>>
>>>> On Wed, Dec 12, 2012 at 8:02 PM, Kazunori INOUE
>>>> <inouekazu at intellilink.co.jp> wrote:
>>>>
>>>>>
>>>>>
>>>>> Hi,
>>>>>
>>>>> I recognize that pacemakerd is much less likely to crash.
>>>>> However, a possibility of being killed by OOM_Killer etc. is not 0%.
>>>>>
>>>>
>>>>
>>>> True. Although we just established in another thread that we don't
>>>> have any leaks :)
>>>>
>>>> So I think that a user gets confused. since behavior at the time of
>>>>> process
>>>>> death differs even if pacemakerd is running.
>>>>>
>>>>> case A)
>>>>> When pacemakerd and other processes (crmd etc.) are the parent-child
>>>>> relation.
>>>>>
>>>>>
>>>> [snip]
>>>>
>>>>
>>>>> For example, crmd died.
>>>>> However, since it is relaunched, the state of the cluster is not
>>>>> affected.
>>>>>
>>>>
>>>>
>>>> Right.
>>>>
>>>> [snip]
>>>>
>>>>
>>>>> case B)
>>>>> When pacemakerd and other processes are NOT the parent-child
>>>>> relation.
>>>>> Although pacemakerd was killed, it assumed the state where it was
>>>>> respawned
>>>>> by Upstart.
>>>>>
>>>>> $ service corosync start ; service pacemaker start
>>>>> $ pkill -9 pacemakerd
>>>>> $ ps -ef|egrep 'corosync|pacemaker|UID'
>>>>> UID PID PPID C STIME TTY TIME CMD
>>>>> root 21091 1 1 14:52 ? 00:00:00 corosync
>>>>> 496 21099 1 0 14:52 ? 00:00:00
>>>>> /usr/libexec/pacemaker/cib
>>>>> root 21100 1 0 14:52 ? 00:00:00
>>>>> /usr/libexec/pacemaker/**stonithd
>>>>> root 21101 1 0 14:52 ? 00:00:00
>>>>> /usr/libexec/pacemaker/lrmd
>>>>> 496 21102 1 0 14:52 ? 00:00:00
>>>>> /usr/libexec/pacemaker/attrd
>>>>> 496 21103 1 0 14:52 ? 00:00:00
>>>>> /usr/libexec/pacemaker/pengine
>>>>> 496 21104 1 0 14:52 ? 00:00:00
>>>>> /usr/libexec/pacemaker/crmd
>>>>> root 21128 1 1 14:53 ? 00:00:00 /usr/sbin/pacemakerd
>>>>>
>>>>
>>>>
>>>> Yep, looks right.
>>>>
>>>>
>>> Hi Andrew,
>>>
>>> We discussed this behavior.
>>> Behavior when pacemakerd and other processes are not parent-child
>>> relation (case B) reached the conclusion that there is room for
>>> improvement.
>>>
>>> Since not all users are experts, they may kill pacemakerd accidentally.
>>> Such a user will get confused if the behavior after crmd death changes
>>> with the following conditions.
>>> case A: pacemakerd and others (crmd etc.) are the parent-child relation.
>>> case B: pacemakerd and others are not the parent-child relation.
>>>
>>> So, we want to *always* obtain the same behavior as the case where
>>> there is parent-child relation.
>>> That is, when crmd etc. die, we want pacemaker to always relaunch
>>> the process always immediately.
>>>
>>
>> No. Sorry.
>> Writing features to satisfy an artificial test case is not a good
>> practice.
>>
>> We can speed up the failure detection for case B (I'll agree that 60s
>> is way too long, 5s or 2s might be better depending on the load is
>> creates), but causing downtime now to _maybe_ avoid downtime in the
>> future makes no sense.
>> Especially when you consider that the node will likely be fenced if
>> the crmd fails anyway.
>>
>> Take a look at the logs from a some ComponentFail test runs and you'll
>> see that the parent-child relationship regularly _fails_ to prevent
>> downtime.
>>
>>
>>> Regards,
>>> Kazunori INOUE
>>>
>>>
>>> In this case, the node will be set to UNCLEAN if crmd dies.
>>>>> That is, the node will be fenced if there is stonith resource.
>>>>>
>>>>
>>>>
>>>> Which is exactly what happens if only pacemakerd is killed with your
>>>> proposal.
>>>> Except now you have time to do a graceful pacemaker restart to
>>>> re-establish the parent-child relationship.
>>>>
>>>> If you want to compare B with something, it needs to be with the old
>>>> "children terminate if pacemakerd dies" strategy.
>>>> Which is:
>>>>
>>>> $ service corosync start ; service pacemaker start
>>>>> $ pkill -9 pacemakerd
>>>>> ... the node will be set to UNCLEAN
>>>>>
>>>>
>>>>
>>>> Old way: always downtime because children terminate which triggers
>>>> fencing
>>>> Our way: no downtime unless there is an additional failure (to the cib
>>>> or
>>>> crmd)
>>>>
>>>> Given that we're trying for HA, the second seems preferable.
>>>>
>>>>
>>>>> $ pkill -9 crmd
>>>>> $ crm_mon -1
>>>>> Last updated: Wed Dec 12 14:53:48 2012
>>>>> Last change: Wed Dec 12 14:53:10 2012 via crmd on dev2
>>>>>
>>>>> Stack: corosync
>>>>> Current DC: dev2 (2472913088) - partition with quorum
>>>>> Version: 1.1.8-3035414
>>>>>
>>>>> 2 Nodes configured, unknown expected votes
>>>>> 0 Resources configured.
>>>>>
>>>>> Node dev1 (2506467520): UNCLEAN (online)
>>>>> Online: [ dev2 ]
>>>>>
>>>>>
>>>>> How about making behavior selectable with an option?
>>>>>
>>>>
>>>>
>>>> MORE_DOWNTIME_PLEASE=(true|**false) ?
>>>>
>>>>
>>>>> When pacemakerd dies,
>>>>> mode A) which behaves in an existing way. (default)
>>>>> mode B) which makes the node UNCLEAN.
>>>>>
>>>>> Best Regards,
>>>>> Kazunori INOUE
>>>>>
>>>>>
>>>>>
>>>>> Making stop work when there is no pacemakerd process is a different
>>>>>> matter. We can make that work.
>>>>>>
>>>>>>
>>>>>>> Though the best solution is to relaunch pacemakerd, if it is
>>>>>>> difficult,
>>>>>>> I think that a shortcut method is to make a node unclean.
>>>>>>>
>>>>>>>
>>>>>>> And now, I tried Upstart a little bit.
>>>>>>>
>>>>>>> 1) started the corosync and pacemaker.
>>>>>>>
>>>>>>> $ cat /etc/init/pacemaker.conf
>>>>>>> respawn
>>>>>>> script
>>>>>>> [ -f /etc/sysconfig/pacemaker ] && {
>>>>>>> . /etc/sysconfig/pacemaker
>>>>>>> }
>>>>>>> exec /usr/sbin/pacemakerd
>>>>>>> end script
>>>>>>>
>>>>>>> $ service co start
>>>>>>> Starting Corosync Cluster Engine (corosync): [ OK
>>>>>>> ]
>>>>>>> $ initctl start pacemaker
>>>>>>> pacemaker start/running, process 4702
>>>>>>>
>>>>>>>
>>>>>>> $ ps -ef|egrep 'corosync|pacemaker'
>>>>>>> root 4695 1 0 17:21 ? 00:00:00 corosync
>>>>>>> root 4702 1 0 17:21 ? 00:00:00 /usr/sbin/pacemakerd
>>>>>>> 496 4703 4702 0 17:21 ? 00:00:00 /usr/libexec/pacemaker/cib
>>>>>>> root 4704 4702 0 17:21 ? 00:00:00
>>>>>>> /usr/libexec/pacemaker/**stonithd
>>>>>>> root 4705 4702 0 17:21 ? 00:00:00
>>>>>>> /usr/libexec/pacemaker/lrmd
>>>>>>> 496 4706 4702 0 17:21 ? 00:00:00
>>>>>>> /usr/libexec/pacemaker/attrd
>>>>>>> 496 4707 4702 0 17:21 ? 00:00:00
>>>>>>> /usr/libexec/pacemaker/pengine
>>>>>>> 496 4708 4702 0 17:21 ? 00:00:00 /usr/libexec/pacemaker/crmd
>>>>>>>
>>>>>>> 2) killed pacemakerd.
>>>>>>>
>>>>>>> $ pkill -9 pacemakerd
>>>>>>>
>>>>>>> $ ps -ef|egrep 'corosync|pacemaker'
>>>>>>> root 4695 1 0 17:21 ? 00:00:01 corosync
>>>>>>> 496 4703 1 0 17:21 ? 00:00:00
>>>>>>> /usr/libexec/pacemaker/cib
>>>>>>> root 4704 1 0 17:21 ? 00:00:00
>>>>>>> /usr/libexec/pacemaker/**stonithd
>>>>>>> root 4705 1 0 17:21 ? 00:00:00
>>>>>>> /usr/libexec/pacemaker/lrmd
>>>>>>> 496 4706 1 0 17:21 ? 00:00:00
>>>>>>> /usr/libexec/pacemaker/attrd
>>>>>>> 496 4707 1 0 17:21 ? 00:00:00
>>>>>>> /usr/libexec/pacemaker/pengine
>>>>>>> 496 4708 1 0 17:21 ? 00:00:00
>>>>>>> /usr/libexec/pacemaker/crmd
>>>>>>> root 4760 1 1 17:24 ? 00:00:00 /usr/sbin/pacemakerd
>>>>>>>
>>>>>>> 3) then I stopped pacemakerd. however, some processes did not stop.
>>>>>>>
>>>>>>> $ initctl stop pacemaker
>>>>>>> pacemaker stop/waiting
>>>>>>>
>>>>>>>
>>>>>>> $ ps -ef|egrep 'corosync|pacemaker'
>>>>>>> root 4695 1 0 17:21 ? 00:00:01 corosync
>>>>>>> 496 4703 1 0 17:21 ? 00:00:00
>>>>>>> /usr/libexec/pacemaker/cib
>>>>>>> root 4704 1 0 17:21 ? 00:00:00
>>>>>>> /usr/libexec/pacemaker/**stonithd
>>>>>>> root 4705 1 0 17:21 ? 00:00:00
>>>>>>> /usr/libexec/pacemaker/lrmd
>>>>>>> 496 4706 1 0 17:21 ? 00:00:00
>>>>>>> /usr/libexec/pacemaker/attrd
>>>>>>> 496 4707 1 0 17:21 ? 00:00:00
>>>>>>> /usr/libexec/pacemaker/pengine
>>>>>>>
>>>>>>> Best Regards,
>>>>>>> Kazunori INOUE
>>>>>>>
>>>>>>>
>>>>>>> This isnt the case when the plugin is in use though, but then I'd
>>>>>>>>>> also
>>>>>>>>>> have expected most of the processes to die also.
>>>>>>>>>>
>>>>>>>>>> Since node status will also change if such a result is brought,
>>>>>>>>> we desire to become so.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>>> ----
>>>>>>>>>>> $ cat /etc/redhat-release
>>>>>>>>>>> Red Hat Enterprise Linux Server release 6.3 (Santiago)
>>>>>>>>>>>
>>>>>>>>>>> $ ./configure --sysconfdir=/etc --localstatedir=/var
>>>>>>>>>>> --without-cman
>>>>>>>>>>> --without-heartbeat
>>>>>>>>>>> -snip-
>>>>>>>>>>> pacemaker configuration:
>>>>>>>>>>> Version = 1.1.8 (Build: 9c13d14)
>>>>>>>>>>> Features = generated-manpages
>>>>>>>>>>> agent-manpages
>>>>>>>>>>> ascii-docs
>>>>>>>>>>> publican-docs ncurses libqb-logging libqb-ipc lha-fencing
>>>>>>>>>>> corosync-native
>>>>>>>>>>> snmp
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> $ cat config.log
>>>>>>>>>>> -snip-
>>>>>>>>>>> 6000 | #define BUILD_VERSION "9c13d14"
>>>>>>>>>>> 6001 | /* end confdefs.h. */
>>>>>>>>>>> 6002 | #include <gio/gio.h>
>>>>>>>>>>> 6003 |
>>>>>>>>>>> 6004 | int
>>>>>>>>>>> 6005 | main ()
>>>>>>>>>>> 6006 | {
>>>>>>>>>>> 6007 | if (sizeof (GDBusProxy))
>>>>>>>>>>> 6008 | return 0;
>>>>>>>>>>> 6009 | ;
>>>>>>>>>>> 6010 | return 0;
>>>>>>>>>>> 6011 | }
>>>>>>>>>>> 6012 configure:32411: result: no
>>>>>>>>>>> 6013 configure:32417: WARNING: Unable to support systemd/upstart.
>>>>>>>>>>> You need
>>>>>>>>>>> to use glib >= 2.26
>>>>>>>>>>> -snip-
>>>>>>>>>>> 6286 | #define BUILD_VERSION "9c13d14"
>>>>>>>>>>> 6287 | #define SUPPORT_UPSTART 0
>>>>>>>>>>> 6288 | #define SUPPORT_SYSTEMD 0
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> Best Regards,
>>>>>>>>>>> Kazunori INOUE
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>> related bugzilla:
>>>>>>>>>>>>> http://bugs.clusterlabs.org/**show_bug.cgi?id=5064<http://bugs.clusterlabs.org/show_bug.cgi?id=5064>
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> Best Regards,
>>>>>>>>>>>>> Kazunori INOUE
>>>>>>>>>>>>>
>>>>>>>>>>>>> ______________________________**_________________
>>>>>>>>>>>>> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
>>>>>>>>>>>>> http://oss.clusterlabs.org/**mailman/listinfo/pacemaker<http://oss.clusterlabs.org/mailman/listinfo/pacemaker>
>>>>>>>>>>>>>
>>>>>>>>>>>>> Project Home: http://www.clusterlabs.org
>>>>>>>>>>>>> Getting started:
>>>>>>>>>>>>> http://www.clusterlabs.org/**doc/Cluster_from_Scratch.pdf<http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf>
>>>>>>>>>>>>> Bugs: http://bugs.clusterlabs.org
>>>>>>>>>>>>>
>>>>>>>>>>>>
>>>
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>>> Getting started: http://www.clusterlabs.org/**
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>>> Bugs: http://bugs.clusterlabs.org
>>>
>>
>> ______________________________**_________________
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>>
>> Project Home: http://www.clusterlabs.org
>> Getting started: http://www.clusterlabs.org/**
>> doc/Cluster_from_Scratch.pdf<http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf>
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>>
>
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>
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>
--
esta es mi vida e me la vivo hasta que dios quiera
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