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# enable out of band gc out of the box, it is low risk and improves perf a lot
ENV['UNICORN_ENABLE_OOBGC'] ||= "1"
# 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
# Since Unicorn is never exposed to outside clients, it does not need to
# run on the standard HTTP port (80), there is no reason to start Unicorn
# as root unless it's from system init scripts.
# If running the master process as root and the workers as an unprivileged
# user, do this to switch euid/egid in the workers (also chowns logs):
# user "unprivileged_user", "unprivileged_group"
# Help ensure your application will always spawn in the symlinked
# "current" directory that Capistrano sets up
working_directory '/usr/share/webapps/discourse' # available in 0.94.0+
# Listen on both a Unix domain socket and a TCP port.
# If you are load-balancing multiple Unicorn masters, lower the backlog
# setting to e.g. 64 for faster failover.
#listen "/var/run/discourse/discourse.socket", :backlog => 1024
listen "127.0.0.1:9737", :tcp_nopush => true
# nuke workers after 30 seconds instead of 60 seconds (the default)
timeout 30
# feel free to point this anywhere accessible on the filesystem
pid '/run/discourse/unicorn.pid'
# By default, the Unicorn logger will write to stderr.
# Additionally, some applications/frameworks log to stderr or stdout,
# so prevent them from going to /dev/null when daemonized here:
stderr_path '/var/log/discourse/unicorn.stderr.log'
stdout_path '/var/log/discourse/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
# If 'UNICORN_ENABLE_OOBGC' is unset let's use GC.copy_on_write_friendly = true.
# http://unicorn.bogomips.org/Unicorn/Configurator.html
unless ENV['UNICORN_ENABLE_OOBGC']
GC.respond_to?(:copy_on_write_friendly=) and
GC.copy_on_write_friendly = true
end
# 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
# local variable to guard against running a hook multiple times
run_once = true
before_fork do |server, worker|
# Occasionally, it may be necessary to run non-idempotent code in the
# master before forking. Keep in mind the above disconnect! example
# is idempotent and does not need a guard.
if run_once
# load up the yaml for the localization bits, in master process
I18n.t(:posts)
# load up all models and schema
(ActiveRecord::Base.connection.tables - %w[schema_migrations]).each do |table|
table.classify.constantize.first rescue nil
end
# router warm up
Rails.application.routes.recognize_path('abc') rescue nil
# get rid of rubbish so we don't share it
GC.start
run_once = false # prevent from firing again
end
# 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!
$redis.client.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 old_pid != server.pid
begin
sig = (worker.nr + 1) >= server.worker_processes ? :QUIT : :TTOU
Process.kill(sig, File.read(old_pid).to_i)
rescue Errno::ENOENT, Errno::ESRCH
end
end
# Throttle the master from forking too quickly by sleeping. Due
# to the implementation of standard Unix signal handlers, this
# helps (but does not completely) prevent identical, repeated signals
# from being lost when the receiving process is busy.
sleep 1
end
after_fork do |server, worker|
Discourse.after_fork
end
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