From: ghazel@gmail.com
To: Eric Wong <normalperson@yhbt.net>
Cc: unicorn list <mongrel-unicorn@rubyforge.org>
Subject: Re: Unicorn 0.97.0 old master is never dying
Date: Fri, 19 Mar 2010 01:55:32 -0700 [thread overview]
Message-ID: <151643b21003190155i351360bg7ce0694d80e0f94@mail.gmail.com> (raw)
In-Reply-To: <20100319082335.GA3191@dcvr.yhbt.net>
>> Here is the entire config file: http://codepad.org/v6lUsuzD
>
> Ugh. I can't even get to that file right now. I actually prefer
> to have config files inline so:
>
> a) I can comment easily on them
> b) I don't have to be online when reading them
> (I sync my mail to a local machine and lose connectivity often)
We're still working on that internet that works when you're not
online. In the meantime:
# Sample configuration file for Unicorn (not Rack)
#
# See http://unicorn.bogomips.org/Unicorn/Configurator.html for complete
# documentation.
require '/data/myapp/current/config/unicorn_constants'
# 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 UnicornConstants::NUM_WORKERS
# Help ensure your application will always spawn in the symlinked
# "current" directory that Capistrano sets up.
working_directory "/data/myapp/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/unicorn.sock", :backlog => 64
listen 8080, :tcp_nopush => true, :tries => -1
# nuke workers after X seconds instead of (60 seconds default)
timeout 300
# feel free to point this anywhere accessible on the filesystem
pid "/data/myapp/shared/pids/unicorn.pid"
# some applications/frameworks log to stderr or stdout, so prevent
# them from going to /dev/null when daemonized here:
stderr_path "/data/myapp/shared/log/unicorn.stderr.log"
stdout_path "/data/myapp/shared/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!
# The following is only recommended for memory/DB-constrained
# installations. It is not needed if your system can house
# twice as many worker_processes as you have configured.
#
# This allows a new master process to incrementally
# phase out the old master process with SIGTTOU to avoid a
# thundering herd (especially in the "preload_app false" case)
# when doing a transparent upgrade. The last worker spawned
# will then kill off the old master process with a SIGQUIT.
old_pid = "#{server.config[: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|
# per-process listener ports for debugging/admin/migrations
addr = "127.0.0.1:#{9000 + worker.nr}"
server.listen(addr, :tries => -1, :delay => 5, :tcp_nopush => true)
# the following is *required* for Rails + "preload_app true",
defined?(ActiveRecord::Base) and
ActiveRecord::Base.establish_connection
# if preload_app is true, then you may also want to check and
# restart any other shared sockets/descriptors such as Memcached,
# and Redis. TokyoCabinet file handles are safe to reuse
# between any number of forked children (assuming your kernel
# correctly implements pread()/pwrite() system calls)
end
-Greg
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prev parent reply other threads:[~2010-03-19 8:56 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-17 9:51 Unicorn 0.97.0 old master is never dying ghazel
2010-03-18 8:40 ` Eric Wong
2010-03-18 16:35 ` ghazel
2010-03-19 8:23 ` Eric Wong
2010-03-19 8:55 ` ghazel [this message]
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