# frozen_string_literal: false # 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 # https://yhbt.net/unicorn/examples/unicorn.conf.minimal.rb # for a much simpler configuration file. # # See https://yhbt.net/unicorn/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 4 # 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 "/path/to/app/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 "/path/to/.unicorn.sock", :backlog => 64 listen 8080, :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 "/path/to/app/shared/pids/unicorn.pid" # By default, the Unicorn logger will write to stderr. # Additionally, ome applications/frameworks log to stderr or stdout, # so prevent them from going to /dev/null when daemonized here: stderr_path "/path/to/app/shared/log/unicorn.stderr.log" stdout_path "/path/to/app/shared/log/unicorn.stdout.log" # combine Ruby 2.0.0+ with "preload_app true" for memory savings preload_app 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 # local variable to guard against running a hook multiple times run_once = 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! # 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 # do_something_once_here ... run_once = false # prevent from firing again end # 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| # 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