Capistrano and Unicorn

Capistrano and Unicorn

[Steve Klabnik]

Anyone have any tips for using Capistrano with unicorn?

I'm following what GitHub did (http://github.com/blog/517-unicorn) ,
and for some reason, my old master isn't dying correctly. If I `pkill
-9 unicorn_rails && unicorn_rails` the new code shows up. I'm thinking
the problem may be with how capistrano uses the 'current' directory as
a symlink.

That config's before_fork seems to make sense to me; I might just be
doing something stupid.

Here's my config, for reference:

# Use at least one worker per core if you're on a dedicated server,
# more will usually help for _short_ waits on databases/caches.
worker_processes 16

working_directory "/home/git/site/current" # available in 0.94.0+

# listen on both a Unix domain socket and a TCP port,
# we use a shorter backlog for quicker failover when busy
listen "/tmp/.sock", :backlog => 64
listen 8080, :tcp_nopush => true

timeout 600

pid "/var/run/unicorn.pid"

# some applications/frameworks log to stderr or stdout, so prevent
# them from going to /dev/null when daemonized here:
stderr_path "/var/log/unicorn.stderr.log"
stdout_path "/var/log/unicorn.stdout.log"

# combine REE with "preload_app true" for memory savings
# http://rubyenterpriseedition.com/faq.html#adapt_apps_for_cow
preload_app true
GC.respond_to?(:copy_on_write_friendly=) and
  GC.copy_on_write_friendly = true

before_fork do |server, worker|
  # the following is highly recomended for Rails + "preload_app true"
  # as there's no need for the master process to hold a connection
  defined?(ActiveRecord::Base) and
    ActiveRecord::Base.connection.disconnect!

  old_pid =  RAILS_ROOT + '/tmp/pids/unicorn.pid.oldbin'
  if File.exists?(old_pid) && server.pid != old_pid
    begin
      Process.kill("QUIT", File.read(old_pid).to_i)
    rescue Errno::ENOENT, Errno::ESRCH
      # someone else did our job for us
    end
  end

end

after_fork do |server, worker|

  # the following is *required* for Rails + "preload_app true",
  defined?(ActiveRecord::Base) and
    ActiveRecord::Base.establish_connection

end

I am using ree, so preload_app should be in effect.

Thanks in advance.
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Re: Capistrano and Unicorn

[Michael Guterl]

On Thu, Feb 18, 2010 at 3:41 PM, Steve Klabnik <steve@steveklabnik.com> wrote:
> Anyone have any tips for using Capistrano with unicorn?
>
Here's the init script we're using to manage unicorn:
http://gist.github.com/308216 some of it may be of use, I can't
remember where we originally found it.

We call `/etc/init.d/unicorn upgrade` in our deploy:restart task.

> I'm following what GitHub did (http://github.com/blog/517-unicorn) ,
> and for some reason, my old master isn't dying correctly. If I `pkill
> -9 unicorn_rails && unicorn_rails` the new code shows up. I'm thinking
> the problem may be with how capistrano uses the 'current' directory as
> a symlink.
>
<snip>
Also be sure to check out http://unicorn.bogomips.org/SIGNALS.html it
is very comprehensive.

Best,
Michael GUterl
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