[Pacemaker] Signal hangup handling for pacemaker and corosync

[Andrew Beekhof]

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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>>>>>>>> 
>>>>>>> 
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>>>>>> 
>>>>>> 
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>>>>>> 
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>>>>>> Bugs: http://bugs.clusterlabs.org
>>>>>> 
>>>>> 
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>>>>> 
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>>>>> Bugs: http://bugs.clusterlabs.org
>>>> 
>>>> 
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>>>> 
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>>>> 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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> 
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