unicorn upstart script

unicorn upstart script

[Josh Sharpe]

I haven't seen my mailing list request confirmed.  Please CC me your
responses - thanks!

Does anyone have a working upstart init script for unicorn?  I've been
trying to write my own, but this is non trivial since USR2 ultimately
changes the PPID of the running unicorn instance.

I'm thinking a a wrapper script maybe required that stays running even
in the event of USR2 to being sent to unicorn, and only dies if the
process identified in the PID file is missing.

Thanks!
Josh
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Re: unicorn upstart script

[Hleb Valoshka]

On 8/10/13, Josh Sharpe <josh.m.sharpe@gmail.com> wrote:
> I'm thinking a a wrapper script maybe required that stays running even
> in the event of USR2 to being sent to unicorn, and only dies if the
> process identified in the PID file is missing.

https://rubyforge.org/pipermail/mongrel-unicorn/2013-July/001820.html
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Re: unicorn upstart script

[Eric Wong]

Josh Sharpe <josh.m.sharpe@gmail.com> wrote:
> I haven't seen my mailing list request confirmed.  Please CC me your
> responses - thanks!

Done!  (I think the confirmation should've gone through, Rubyforge has
been acting funny...).  Anyways it's common practice on many FOSS
mailing lists to Cc: all parties (but not Ruby-related lists,
unfortunately...)[1]

> Does anyone have a working upstart init script for unicorn?  I've been
> trying to write my own, but this is non trivial since USR2 ultimately
> changes the PPID of the running unicorn instance.

There's been some talk of it if you search the mailing list archives for
links.  I get all the modern init replacements mixed up with each other
:x

> I'm thinking a a wrapper script maybe required that stays running even
> in the event of USR2 to being sent to unicorn, and only dies if the
> process identified in the PID file is missing.

I posted this the other day but haven't gotten much feedback on it:
http://mid.gmane.org/20130724031151.GA14534@dcvr.yhbt.net



[1] Fwiw, I prefer Cc: to all anyways.  It's easier to rope in folks for
    issues that aren't isolated to the project at hand.
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Re: unicorn upstart script

[Josh Sharpe]

I like the unicorn_forever idea, but as it's lightly tested, I
continued down the path of trying to hack upstart into compliance and
came up with this...  Might as well share.

This works nicely when USR2 is received, and restarts the master if
for whatever reason it dies.

Cheers!

$ cat /etc/init/unicorn.conf
description "Unicorn configuration"

start on filesystem
stop on shutdown

respawn

kill signal QUIT

script
  start-stop-daemon --start --chuid blue --chdir
/u/apps/blue-test-app/current --exec /usr/bin/bundle exec
unicorn_rails -- -c /u/apps/blue-test-app/shared/system/unicorn.cfg -E
production

  exists=0
  pidfile=/tmp/unicorn.master.pid
  oldpidfile=/tmp/unicorn.master.pid.oldbin

  while [ $exists -eq 0 ]
  do
    sleep 0.1

    (test -f $pidfile && pgrep -P $(cat $pidfile)) || (test -f
$oldpidfile && pgrep -P $(cat $oldpidfile))
    exists=$?
  done

  exec rm /tmp/unicorn.master.pid
  exec rm /tmp/unicorn.master.pid.oldbin

  exit 1
end script

On Sat, Aug 10, 2013 at 2:20 AM, Hleb Valoshka <375gnu@gmail.com> wrote:
> On 8/10/13, Josh Sharpe <josh.m.sharpe@gmail.com> wrote:
>> I'm thinking a a wrapper script maybe required that stays running even
>> in the event of USR2 to being sent to unicorn, and only dies if the
>> process identified in the PID file is missing.
>
> https://rubyforge.org/pipermail/mongrel-unicorn/2013-July/001820.html
> _______________________________________________
> Unicorn mailing list - mongrel-unicorn@rubyforge.org
> http://rubyforge.org/mailman/listinfo/mongrel-unicorn
> Do not quote signatures (like this one) or top post when replying
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