From: Tatsuya Ono <firstname.lastname@example.org>
To: mongrel-unicorn <email@example.com>
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.
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.
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
Then Unicorn flies in the jail happily.
Unicorn mailing list - firstname.lastname@example.org
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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 ` Unicorn in the jail Eric Wong
2011-08-03 21:57 ` Tatsuya Ono
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