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October 12, 2015 13:23
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Unicorn Config
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# Sample verbose configuration file for Unicorn (not Rack) | |
# | |
# This configuration file documents many features of Unicorn | |
# that may not be needed for some applications. See | |
# http://unicorn.bogomips.org/examples/unicorn.conf.minimal.rb | |
# for a much simpler configuration file. | |
# | |
# See http://unicorn.bogomips.org/Unicorn/Configurator.html for complete | |
# documentation. | |
# 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 2 | |
# listen on both a Unix domain socket and a TCP port, | |
# we use a shorter backlog for quicker failover when busy | |
listen "/path/to/unicorn.sock", :backlog => 64 | |
pid "/path/to/unicorn.pid" | |
timeout 180 | |
# set log paths | |
stderr_path "/path/to/unicorn.stderr.log" | |
stdout_path "/path/to/rails/stronghold/unicorn.stdout.log" | |
# combine Ruby 2.0.0dev or 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 | |
# Enable this flag to have unicorn test client connections by writing the | |
# beginning of the HTTP headers before calling the application. This | |
# prevents calling the application for connections that have disconnected | |
# while queued. This is only guaranteed to detect clients on the same | |
# host unicorn runs on, and unlikely to detect disconnects even on a | |
# fast LAN. | |
check_client_connection false | |
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! | |
# Before forking, kill the master process that belongs to the .oldbin PID. | |
# This enables 0 downtime. | |
old_pid = "/path/to/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| | |
# per-process listener ports for debugging/admin/migrations | |
# addr = "127.0.0.1:#{9293 + 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 |
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