我也被困在试图找到有关 puma 配置文件的文档，但我确实发现一体化 config.ru文件很有用。我在这里对其进行了格式化以供将来参考：
# The directory to operate out of.
# The default is the current directory.
directory '/u/apps/lolcat'
# Load “path” as a rackup file.
# The default is “config.ru”.
rackup '/u/apps/lolcat/config.ru'
# Set the environment in which the rack's app will run. The value must be a string.
# The default is “development”.
environment 'production'
# Daemonize the server into the background. Highly suggest that
# this be combined with “pidfile” and “stdout_redirect”.
# The default is “false”.
daemonize
daemonize false
# Store the pid of the server in the file at “path”.
pidfile '/u/apps/lolcat/tmp/pids/puma.pid'
# Use “path” as the file to store the server info state. This is
# used by “pumactl” to query and control the server.
state_path '/u/apps/lolcat/tmp/pids/puma.state'
# Redirect STDOUT and STDERR to files specified. The 3rd parameter
# (“append”) specifies whether the output is appended, the default is
# “false”.
stdout_redirect '/u/apps/lolcat/log/stdout', '/u/apps/lolcat/log/stderr'
stdout_redirect '/u/apps/lolcat/log/stdout', '/u/apps/lolcat/log/stderr', true
# Disable request logging.
# The default is “false”.
quiet
# Configure “min” to be the minimum number of threads to use to answer
# requests and “max” the maximum.
# The default is “0, 16”.
threads 0, 16
# Bind the server to “url”. “tcp://”, “unix://” and “ssl://” are the only
# accepted protocols.
# The default is “tcp://0.0.0.0:9292”.
bind 'tcp://0.0.0.0:9292'
bind 'unix:///var/run/puma.sock'
bind 'unix:///var/run/puma.sock?umask=0777'
bind 'ssl://127.0.0.1:9292?key=path_to_key&cert=path_to_cert'
# Listens on port 7001
# The default is 9292
port 7001
# Instead of “bind 'ssl://127.0.0.1:9292?key=path_to_key&cert=path_to_cert'” you
# can also use the “ssl_bind” option.
ssl_bind '127.0.0.1', '9292', { key: path_to_key, cert: path_to_cert }
# Code to run before doing a restart. This code should
# close log files, database connections, etc.
# This can be called multiple times to add code each time.
on_restart do
puts 'On restart...'
end
# Command to use to restart puma. This should be just how to
# load puma itself (ie. 'ruby -Ilib bin/puma'), not the arguments
# to puma, as those are the same as the original process.
restart_command '/u/app/lolcat/bin/restart_puma'
# === Cluster mode ===
# How many worker processes to run.
# The default is “0”.
workers 2
# Code to run when a worker boots to setup the process before booting
# the app.
# This can be called multiple times to add hooks.
on_worker_boot do
puts 'On worker boot...'
end
# === Puma control rack application ===
# Start the puma control rack application on “url”. This application can
# be communicated with to control the main server. Additionally, you can
# provide an authentication token, so all requests to the control server
# will need to include that token as a query parameter. This allows for
# simple authentication.
# Check out https://github.com/puma/puma/blob/master/lib/puma/app/status.rb
# to see what the app has available.
activate_control_app 'unix:///var/run/pumactl.sock'
activate_control_app 'unix:///var/run/pumactl.sock', { auth_token: '12345' }
activate_control_app 'unix:///var/run/pumactl.sock', { no_token: true }
然后这些设置将进入一个 ruby 文件（例如 config/puma.rb），然后正如 Starkers 所说，你可以运行它
puma -C 配置/puma.rb