[Pacemaker] Signal hangup handling for pacemaker and corosync
Andrew Beekhof
andrew at beekhof.net
Mon Jul 21 05:36:51 UTC 2014
On 21 Jul 2014, at 2:50 pm, Vladislav Bogdanov <bubble at hoster-ok.com> wrote:
> 21.07.2014 06:28, Andrew Beekhof wrote:
>>
>> On 15 Jul 2014, at 8:45 pm, Arjun Pandey <apandepublic at gmail.com> wrote:
>>
>>> On Tue, Jul 15, 2014 at 3:36 PM, Andrew Beekhof <andrew at beekhof.net> wrote:
>>>>
>>>> On 15 Jul 2014, at 8:00 pm, Arjun Pandey <apandepublic at gmail.com> wrote:
>>>>
>>>>> Right. Actually the issue i am facing is that i am starting the
>>>>> pacemaker service remotely from a wrapper and thus pacemakerd dies
>>>>> when the wrapper exits.nohup solves the problem but then HUP cannot be
>>>>> used by pacemaker. Is this workaround ok ?
>>>>
>>>> I guess. How are you starting pacemaker? Usually its with some variant of 'service pacemaker start'.
>>> I am using 'service pacemaker start'. However this is being called
>>> from my script. So when the script exits pacemaker gets SIGHUP.
>>
>> Release testing starts clusters as:
>>
>> ssh -l root somenode -- service pacemaker start
>
> It could depend on what "service" is.
> It would either schedule systemd to run job (el7/fc18+), or just run
> init script itself (el6). In latter case, if process didn't detach from
> its controlling terminal when that terminal gone away, it will be sent a
> SIGHUP.
Except we test rhel6 the same way...
> I'd recommend adding HUP handler (f.e. ignore) or/and detach
> (setsid()) right before daemonizing.
>
>>
>> And I've never seen the behaviour you speak of.
>> How is what you're doing different?
>>
>>>>
>>>>>
>>>>> I was checking out the current pacemaker code.setsid is called for
>>>>> each child process.However if we do this for main process to then it
>>>>> will also be detached from the terminal.
>>>>>
>>>>> Regards
>>>>> Arjun
>>>>>
>>>>>
>>>>>
>>>>> On Tue, Jul 15, 2014 at 3:01 PM, Andrew Beekhof <andrew at beekhof.net> wrote:
>>>>>>
>>>>>> On 15 Jul 2014, at 7:13 pm, Arjun Pandey <apandepublic at gmail.com> wrote:
>>>>>>
>>>>>>> Hi Andrew
>>>>>>>
>>>>>>> AFAIK linux daemons don't terminate on SIGHUP.
>>>>>>
>>>>>> Read the man page, POSIX specifies that the default action is 'term' ie. 'terminate'.
>>>>>>
>>>>>>> They typically reload
>>>>>>> configuration on receiving this signal.Eg- rsyslogd. I thought it was
>>>>>>> safe to make this assumption here as well.
>>>>>>
>>>>>> Not anywhere as it turns out
>>>>>>
>>>>>>>
>>>>>>> Regards
>>>>>>> Arjun
>>>>>>>
>>>>>>> On Tue, Jul 15, 2014 at 2:15 PM, Andrew Beekhof <andrew at beekhof.net> wrote:
>>>>>>>>
>>>>>>>> On 15 Jul 2014, at 6:19 pm, Arjun Pandey <apandepublic at gmail.com> wrote:
>>>>>>>>
>>>>>>>>> Hi all
>>>>>>>>>
>>>>>>>>> I am running pacemaker version 1.1.10-14.el6 on CentOS 6. On setting
>>>>>>>>> up cluster if I send SIGHUP to either pacemaker or corosync services ,
>>>>>>>>> they die.
>>>>>>>>> Is this a bug ? What is the intension behind this behavior?
>>>>>>>>
>>>>>>>> Standard default I believe.
>>>>>>>> Have you run 'man 7 signal' lately?
>>>>>>>>
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>>>>>>>>
>>>>>>>> Project Home: http://www.clusterlabs.org
>>>>>>>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
>>>>>>>> Bugs: http://bugs.clusterlabs.org
>>>>>>>>
>>>>>>>
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>>>>>>>
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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
>>>>>> Bugs: http://bugs.clusterlabs.org
>>>>>>
>>>>>
>>>>> _______________________________________________
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>>>>> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>>>>>
>>>>> Project Home: http://www.clusterlabs.org
>>>>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
>>>>> 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
>>>> 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
>>> Bugs: http://bugs.clusterlabs.org
>>
>>
>>
>> _______________________________________________
>> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
>> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>>
>> Project Home: http://www.clusterlabs.org
>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
>> Bugs: http://bugs.clusterlabs.org
>>
>
>
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> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>
> Project Home: http://www.clusterlabs.org
> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
> Bugs: http://bugs.clusterlabs.org
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