From: Clifton King <cliftonk@gmail.com>
To: unicorn list <mongrel-unicorn@rubyforge.org>
Subject: Re: synchronous restart
Date: Tue, 31 Aug 2010 14:08:39 -0500 [thread overview]
Message-ID: <AANLkTik5v5mCRecaWo0R-4m+ns-=pwJhZJf-XFzUdzGp@mail.gmail.com> (raw)
In-Reply-To: <9ADECA6F-ED48-467D-8826-2C94BF42B18A@tramchase.com>
Jamie,
Here is a sample unicorn config file that automatically sends the old
master process a QUIT signal if the new master process successfully
boots and starts forking (which is what I assume you are asking
about). We get 0 downtime deploys using this method (and changes
typically propagate live in 5-10 seconds). If the new master process
fails at booting, you can tail the unicorn.stdout/err.log files to see
why.
http://pastie.org/1129610
Most of that configuration file was from a github blog post about
unicorn (you can try googling for it).
I also added a section that writes out PID files for workers so you
can monitor their memory usage (and send them quit signals when they
exceed the limit). We do that via god.
Hope that helps,
Clifton
On Tue, Aug 31, 2010 at 1:30 PM, Jamie Wilkinson <jamie@tramchase.com> wrote:
> Has anyone tried to synchronously restart their unicorns, to ensure that things restart OK?
>
> I imagine I could write a script that sent USR2 and then watched the log for a successful before exiting, but I dream there is something more MAGICAL
>
>
> Yours in mythical web servers,
>
> -jamie
>
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next prev parent reply other threads:[~2010-08-31 19:09 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-31 18:30 synchronous restart Jamie Wilkinson
2010-08-31 19:08 ` Clifton King [this message]
2010-08-31 20:08 ` Jamie Wilkinson
2010-08-31 20:15 ` Clifton King
2010-08-31 20:29 ` Stephen Eley
2010-08-31 23:59 ` Lawrence Pit
2010-08-31 20:58 ` Stephen Eley
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