From: Tatsuya Ono <email@example.com> To: mongrel-unicorn <firstname.lastname@example.org> Subject: Unicorn in the jail Date: Wed, 3 Aug 2011 17:41:03 +0100 [thread overview] Message-ID: <CAHBuKRj09FdxAgzsefJWotexw-7JYZGJMtgUp_dhjPz9VbKD6Q@mail.gmail.com> (raw) I ran into a problem when sending USR2 signal to master process which is listening a TCP port. It shows the following error in log. err: adding listener failed addr=0.0.0.0:3010 (in use) I found similar error reported on this mailing list and yes, the host I got the error was in the FreeBSD jail. http://rubyforge.org/pipermail/mongrel-unicorn/2009-December/000205.html http://rubyforge.org/pipermail/mongrel-unicorn/2009-December/000212.html I dug into the problem and found some interesting thing. I want to share it and the solution here. * Why does it happen in the Jail? When you bind 0.0.0.0 address to the socket on a Jail host, Jail doesn't bind 0.0.0.0. Instead of it, it binds to the IP address of the host such as 10.100.1.50, 192.168.1.50, etc. Then the problem happens in Unicorn::HttpServer#inherit_listeners! when it gets signal like USR2. https://github.com/defunkt/unicorn/blob/406b8b0e2ed6e5be34d8ec3cd4b16048233c2856/lib/unicorn/http_server.rb#L703-731 Here you get 10.100.1.50 (for example) as inherited address from ENV['UNICORN_FD'] but 0.0.0.0. So Unicorn tries to bind to 0.0.0.0 (again) at line 728. Then it fails because it is actually in use. * How to solve the issue? Thankfully unicorn.conf is ruby script so that I could write a logic for Jail hosts without specifying IP address of those hosts (which we want to avoid since we deploy it multiple servers). I share the configuration file. https://gist.github.com/1122965 Then Unicorn flies in the jail happily. Tatsuya Ono _______________________________________________ Unicorn mailing list - email@example.com http://rubyforge.org/mailman/listinfo/mongrel-unicorn Do not quote signatures (like this one) or top post when replying
next reply other threads:[~2011-08-03 16:48 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2011-08-03 16:41 Tatsuya Ono [this message] 2011-08-03 18:03 ` Eric Wong 2011-08-03 21:57 ` Tatsuya Ono
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