[Pacemaker] How can stonith-plugins send messages to ha-log?

[Takenaka Kazuhiro]

Hi, Dejan

 >> I think the way you suggested is also a possible choice.
 >>
 >> Actually, some existing plugins expect this function. They use 'echo'
 >> to put their messages. But currently, those messages are sent to
 >> 'ha-debug', not 'ha-log'.
 >
 > I suspect that that would be the simplest way, i.e. to enable
 > logging of stdout/stderr from the external stonith plugins. Note
 > also that the plugins may be used from the command line, through
 > the stonith program. In that case it wouldn't be optimal to send
 > messages to the logs.

Your thought is worth considering.

 > I'd suggest to open an enhancement bugzilla.

I will check in this matter into bugzilla later.

> Hi Takenaka-san,
> 
> On Thu, Sep 25, 2008 at 05:03:39PM +0900, Takenaka Kazuhiro wrote:
>> Hi, Dejan
>>
>> Thanks for your reply.
>>
>> >> > If there is a similar function to 'ocf_log' for stonith-plugins,
>> >> > I think it must be handy. Or I should simply have my stonith-plugins
>> >> > use 'ocf_log'?
>> >
>> > Yes.
>>
>> I suspected a bit that 'stonithd' might not pass some of enviroment
>> valiables to plugins, So I tried to check it out and found that
>> 'HA_LOGD' wasn't given to plugins.
>>
>> I wrote the following statements into my plugin.
>>
>> . ${OCF_ROOT}/resource.d/heartbeat/.ocf-shellfuncs
>> ha_logger -t INFO -D ha-log "Sending a message by ha_logger"
>> ocf_log INFO "Sending a message by ocf_log"
>>
>> Then I ran my cluster and watched /var/log/ha-log. The messages of
>> 'ha_logger' appeared in 'ha-log', but those of 'ocf_log' did not.
>> Because 'ha_log' (called by ocf_log) doesn't use 'ha_logger' when
>> 'HA_LOGD' isn't defined.
>>
>> One way is to change 'stonithd' to pass 'HA_LOGD' to plugins.
> 
> Yes, but I'd still prefer to capture the messages on
> stdout/stderr.
> 
>> Or plugins should use 'ha_logger' directly?
> 
> That probably won't do, since the setups without ha_logd are
> possible.
> 
>> > Though the preferable way would be to have the parent plugin
>> > (external.c) collect the output and send it to the logger, in the
>> > same way the lrmd does with resource agents.
>>
>> I think the way you suggested is also a possible choice.
>>
>> Actually, some existing plugins expect this function. They use 'echo'
>> to put their messages. But currently, those messages are sent to
>> 'ha-debug', not 'ha-log'.
> 
> I suspect that that would be the simplest way, i.e. to enable
> logging of stdout/stderr from the external stonith plugins. Note
> also that the plugins may be used from the command line, through
> the stonith program. In that case it wouldn't be optimal to send
> messages to the logs.
> 
> I'd suggest to open an enhancement bugzilla.
> 
> Thanks,
> 
> Dejan
> 
>>> Hi,
>>>
>>> On Wed, Sep 24, 2008 at 04:14:03PM +0900, Takenaka Kazuhiro wrote:
>>>> > Hi all.
>>>> > > I looked through stonith-plugins in /usr/lib/stonith/plugins/external
>>>> > to find out stonith-plugins' official way to send their messages to
>>>> > ha-log, but I couldn't find it.
>>>> > > If there is a similar function to 'ocf_log' for stonith-plugins,
>>>> > I think it must be handy. Or I should simply have my stonith-plugins
>>>> > use 'ocf_log'?
>>>
>>> Yes.
>>>
>>> Though the preferable way would be to have the parent plugin
>>> (external.c) collect the output and send it to the logger, in the
>>> same way the lrmd does with resource agents.
>>>
>>> Thanks,
>>>
>>> Dejan
>>>
>>>> > Best regards.
>>>> > -- > Takenaka Kazuhiro <takenaka.kazuhiro at oss.ntt.co.jp>
>>>> > > _______________________________________________
>>>> > Pacemaker mailing list
>>>> > Pacemaker at clusterlabs.org
>>>> > http://list.clusterlabs.org/mailman/listinfo/pacemaker
>>>
>>> _______________________________________________
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>>
>> -- 
>> Takenaka Kazuhiro <takenaka.kazuhiro at oss.ntt.co.jp>
>>
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>> Pacemaker at clusterlabs.org
>> http://list.clusterlabs.org/mailman/listinfo/pacemaker
> 
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-- 
Takenaka Kazuhiro <takenaka.kazuhiro at oss.ntt.co.jp>