rsyslog script

[James Hunt]

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On 24/03/11 06:32, Mathijs wrote:
> Hello,
> 
> Im not sure if this will work, but did you try something like this?
> 
> pre-start script
>     COMPAT=$(/sbin/rsyslogd -v | awk 'NR == 1{print substr($2, 1, 1)}')
>     export COMPAT
> end script
Unfortunately, that won't work. By exporting the variable here, you make
it accessible to any child process (ie sub-shell) of the pre-start
process, but you cannot export it "back" to the parent process.

>  
> 
> 
> ??
> 
> On 2011-03-24 01:43, Grail Dane wrote:
>> Hi James
>>
>> Thanks very much for the reply :)
>>
>> I had added the full path to exec as well but had not updated that when
> posting (oops)
>>
>> Your solution to remove the variable and use the substitution has
> worked but looks untidy in comparison.
>> Is there no real way to pass variables to other parts of the script?
>>
>> I assume, based on script now working, that the script / end script
> stanzas treat all variables as local hence not available
>> outside. Is there an option to maybe have a global variable for a
> particular script that could be set inside one stanza and used
>> either in another or the exec line as in my example?
>>
>> Thanks again for the assist
>>
>> cheers
>> grail
>>
>> > Date: Wed, 23 Mar 2011 09:12:10 +0000
>> > From: james.hunt at canonical.com
>> > To: upstart-devel at lists.ubuntu.com
>> > Subject: Re: rsyslog script
>> >
>> On 23/03/11 01:20, Grail Dane wrote:
>> > In case anyone can see room to point me in the right direction here, I
>> > have recorded my latest bootup
>> > messages and the one for my rsyslog looks like:
>>
>> > init: rsyslog main process (860) terminated with status 1
>> > init: rsyslog main process ended, respawning
>>
>> > As you can see it seems to respawn but without an associated PID yet
>> > running initctl list the corresponding entry is:
>>
>> > rsyslog start/running
>>
>> > Whereas all others with a PID also have - , process PID
>> > And even though it says running, a ps yields nothing and no logs are
>> > getting updated.
>>
>> > Any thoughts or help would be appreciated :)
>> > grail
>>
>> > ------------------------------------------------------------------------
>> > From: grail69 at hotmail.com
>> > To: upstart-devel at lists.ubuntu.com
>> > Subject: rsyslog script
>> > Date: Tue, 1 Mar 2011 03:23:15 +0000
>>
>> > I seem to be stuck with this one and not sure if possible to do what I
>> > am trying?
>>
>> > I copied the rsyslog.conf from my Ubuntu machine and changed it to the
>> > below:
>>
>> > < ---------- start ----------------->
>> > # rsyslog - system logging daemon
>> > #
>> > # rsyslog is an enhanced multi-threaded replacement for the traditional
>> > # syslog daemon, logging messages from applications
>>
>> > description"system logging daemon"
>>
>> > start on filesystem
>> > stop on runlevel [06]
>>
>> > expect fork
>> > respawn
>>
>> > pre-start script
>> > COMPAT=$(/sbin/rsyslogd -v | awk 'NR == 1{print substr($2, 1, 1)}')
>> > end script
>>
>> > exec rsyslogd -c$COMPAT
>> > < ---------- end ----------------->
>>
>> > This seems to start and assign a PID, it then terminates and respawns
>> > but without a PID and consequently is not really running.
>>
>> > So i guess my question is: Am I not able to use variables in this way or
>> > have I done it the wrong way?
>> > If yes to the wrong way, would someone please educate me?
>>
>> > Also I am guessing this is not really a devel question ... is there a
>> > support list?
>>
>> > Cheers
>> > grail
>>
>> > -- upstart-devel mailing list upstart-devel at lists.ubuntu.com Modify
>> > settings or unsubscribe at:
>> > https://lists.ubuntu.com/mailman/listinfo/upstart-devel
>>
>> Hi Grail,
>>
>> The problem with your script is that the "COMPAT" variable is not
>> "visible" to the exec stanza: Upstart runs each script section in a
>> separate process. Therefore I think that your exec is actually running
>> "rsyslogd -c" (which is invalid).
>>
>> As to a solution: you don't actually need that pre-start. You could just
>> do this:
>>
>> exec rsyslogd -c$(/sbin/rsyslogd -v | awk 'NR == 1{print substr($2, 1,
>> 1)}')
>>
>> One other comment: you have specified the path to rsyslogd in your
>> pre-start, but not in your exec stanza. I appreciate that the original
>> .conf file has the same problem, but it is always best to specify the
>> path to avoid surprises :)
>>
>> Finally, be careful with respawn and script sections (see
>> https://bugs.launchpad.net/upstart/+bug/406397).
>>
>> Regards,
>>
>> James.
>> >
> --
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> 
> 

James.
- --
James Hunt
____________________________________
Ubuntu Foundations Team, Canonical.
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