Address already in use

From: Manuel Palenciano Guerrero <mpalenciano@gmail.com>
To: unicorn list <mongrel-unicorn@rubyforge.org>
Subject: Address already in use
Date: Mon, 25 Jun 2012 15:02:30 +0200	[thread overview]
Message-ID: <0B72D3D4-CB04-47F2-B188-CAFDF41B8B1F@gmail.com> (raw)

Hello there,

I seem to have a problem with unix-sockets, and cannot see many people with the same situation when googling.

The problem is when upgrading (USR2 + QUIT) our applications. I get the following error very frequently but not always.

E, [2012-06-21T11:40:46.386486 #29401] ERROR -- : adding listener failed addr=/tmp/unicorn.app.sock (in use)
E, [2012-06-21T11:40:46.386669 #29401] ERROR -- : retrying in 0.5 seconds (4 tries left)
E, [2012-06-21T11:40:46.887724 #29401] ERROR -- : adding listener failed addr=/tmp/unicorn.app.sock (in use)
E, [2012-06-21T11:40:46.887832 #29401] ERROR -- : retrying in 0.5 seconds (3 tries left)
E, [2012-06-21T11:40:47.388813 #29401] ERROR -- : adding listener failed addr=/tmp/unicorn.app.sock (in use)
E, [2012-06-21T11:40:47.388894 #29401] ERROR -- : retrying in 0.5 seconds (2 tries left)
E, [2012-06-21T11:40:47.889878 #29401] ERROR -- : adding listener failed addr=/tmp/unicorn.app.sock (in use)
E, [2012-06-21T11:40:47.889957 #29401] ERROR -- : retrying in 0.5 seconds (1 tries left)
E, [2012-06-21T11:40:48.390939 #29401] ERROR -- : adding listener failed addr=/tmp/unicorn.app.sock (in use)
E, [2012-06-21T11:40:48.391020 #29401] ERROR -- : retrying in 0.5 seconds (0 tries left)
E, [2012-06-21T11:40:48.892002 #29401] ERROR -- : adding listener failed addr=/tmp/unicorn.app.sock (in use)
/var/www/app/staging/shared/bundle/ruby/1.8/gems/unicorn-4.3.0/lib/unicorn/socket_helper.rb:140:in `initialize': Address already in use - /tmp/unicorn.app.sock (Errno::EADDRINUSE)

...and the only way around that I know is stoping and starting the app, even in production.

We have preload_app => true, and ONLY listening on unix-sockets, no TCP-sockets.

The only solution I can think of would we switching to TCP, but would there be a reason on doing such ?

Is this happening to any body else ? and would you know a possible solution ?

Thanks very much in advance !

Manuel Palenciano
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