From: Eric Wong <normalperson@yhbt.net>
To: unicorn list <mongrel-unicorn@rubyforge.org>
Subject: Re: [PATCH] Start the server if another user has a PID matching our stale pidfile.
Date: Tue, 20 Mar 2012 20:10:10 +0000 [thread overview]
Message-ID: <20120320201010.GA6857@dcvr.yhbt.net> (raw)
In-Reply-To: <20120229172559.GA26211@dcvr.yhbt.net>
Eric Wong <normalperson@yhbt.net> wrote:
> Graham Bleach <graham@darkskills.org.uk> wrote:
> > If unicorn doesn't get terminated cleanly (for example if the machine
> > has its power interrupted) and the pid in the pidfile gets used by
> > another process, the current unicorn code will exit and not start a
> > server. This tiny patch fixes that behaviour.
>
> Thanks! Acked-by: Eric Wong <normalperson@yhbt.net>
>
> and pushed to master on git://bogomips.org/unicorn.git
Btw, I also pushed this to be a little more informative:
>From d0e7d8d770275654024887a05d9e986589ba358c Mon Sep 17 00:00:00 2001
From: Eric Wong <normalperson@yhbt.net>
Date: Tue, 20 Mar 2012 20:05:59 +0000
Subject: [PATCH] log EPERM errors from invalid pid files
In some cases, EPERM may indicate a real configuration problem,
but it can also just mean the pid file is stale.
---
lib/unicorn/http_server.rb | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/lib/unicorn/http_server.rb b/lib/unicorn/http_server.rb
index 0c2af5d..ede6264 100644
--- a/lib/unicorn/http_server.rb
+++ b/lib/unicorn/http_server.rb
@@ -656,7 +656,10 @@ class Unicorn::HttpServer
wpid <= 0 and return
Process.kill(0, wpid)
wpid
- rescue Errno::ESRCH, Errno::ENOENT, Errno::EPERM
+ rescue Errno::EPERM
+ logger.info "pid=#{path} possibly stale, got EPERM signalling PID:#{wpid}"
+ nil
+ rescue Errno::ESRCH, Errno::ENOENT
# don't unlink stale pid files, racy without non-portable locking...
end
--
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prev parent reply other threads:[~2012-03-20 20:12 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-29 14:34 [PATCH] Start the server if another user has a PID matching our stale pidfile Graham Bleach
2012-02-29 17:25 ` Eric Wong
2012-03-20 20:10 ` Eric Wong [this message]
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