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Class: Puma::DSL

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Instance Chain:
Inherits: Object
Defined in: lib/puma/dsl.rb

Overview

The methods that are available for use inside the configuration file. These same methods are used in ::Puma cli and the rack handler internally.

Used manually (via CLI class):

config = Configuration.new({}) do |user_config|
  user_config.port 3001
end
config.load

puts config.options[:binds] # => "tcp://127.0.0.1:3001"

Used to load file:

$ cat puma_config.rb
port 3002

Resulting configuration:

config = Configuration.new(config_file: "puma_config.rb")
config.load

puts config.options[:binds] # => "tcp://127.0.0.1:3002"

You can also find many examples being used by the test suite in test/config.

Constant Summary

ConfigDefault - Included

DefaultRackup, DefaultTCPHost, DefaultTCPPort, DefaultWorkerShutdownTimeout, DefaultWorkerTimeout

Class Method Summary

Instance Method Summary

Constructor Details

.new(options, config) ⇒ DSL

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 37

def initialize(options, config)
  @config  = config
  @options = options

  @plugins = []
end

Instance Method Details

#_load_from(path)

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 44

def _load_from(path)
  if path
    @path = path
    instance_eval(File.read(path), path, 1)
  end
ensure
  _offer_plugins
end

#_offer_plugins

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 53

def _offer_plugins
  @plugins.each do |o|
    if o.respond_to? :config
      @options.shift
      o.config self
    end
  end

  @plugins.clear
end

#activate_control_app(url = "auto", opts = {})

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 App::Status to see what the app has available.

Examples:

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 }
[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 127

def activate_control_app(url="auto", opts={})
  if url == "auto"
    path = Configuration.temp_path
    @options[:control_url] = "unix://#{path}"
    @options[:control_url_temp] = path
  else
    @options[:control_url] = url
  end

  if opts[:no_token]
    # We need to use 'none' rather than :none because this value will be
    # passed on to an instance of OptionParser, which doesn't support
    # symbols as option values.
    #
    # See: https://github.com/puma/puma/issues/1193#issuecomment-305995488
    auth_token = 'none'
  else
    auth_token = opts[:auth_token]
    auth_token ||= Configuration.random_token
  end

  @options[:control_auth_token] = auth_token
  @options[:control_url_umask] = opts[:umask] if opts[:umask]
end

#after_worker_boot(&block)

Alias for #after_worker_fork.

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 540

alias_method :after_worker_boot, :after_worker_fork

#after_worker_fork(&block) Also known as: #after_worker_boot

Note:

Cluster mode only.

Code to run in the master after a worker has been started. The worker's index is passed as an argument.

This is called everytime a worker is to be started.

Examples:

after_worker_fork do
  puts 'After worker fork...'
end
[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 535

def after_worker_fork(&block)
  @options[:after_worker_fork] ||= []
  @options[:after_worker_fork] = block
end

#app(obj = nil, &block)

Use an object or block as the rack application. This allows the configuration file to be the application itself.

Examples:

app do |env|
  body = 'Hello, World!'

  [
    200,
    {
      'Content-Type' => 'text/plain',
      'Content-Length' => body.length.to_s
    },
    [body]
  ]
end

See Also:

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 105

def app(obj=nil, &block)
  obj ||= block

  raise "Provide either a #call'able or a block" unless obj

  @options[:app] = obj
end

#before_fork(&block)

Note:

Cluster mode only.

Code to run immediately before master process forks workers (once on boot). These hooks can block if necessary to wait for background operations unknown to ::Puma to finish before the process terminates. This can be used to close any connections to remote servers (database, Redis, …) that were opened when preloading the code.

This can be called multiple times to add several hooks.

Examples:

before_fork do
  puts "Starting workers..."
end
[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 473

def before_fork(&block)
  @options[:before_fork] ||= []
  @options[:before_fork] << block
end

#bind(url)

Bind the server to url. “tcp://”, “unix://” and “ssl://” are the only accepted protocols. Multiple urls can be bound to, calling bind does not overwrite previous bindings.

The default is “tcp://0.0.0.0:9292”.

You can use query parameters within the url to specify options:

  • Set the socket backlog depth with backlog, default is 1024.

  • Set up an SSL certificate with key & cert.

  • Set whether to optimize for low latency instead of throughput with low_latency, default is to optimize for low latency. This is done via Socket::TCP_NODELAY.

  • Set socket permissions with umask.

Examples:

Backlog depth

bind 'unix:///var/run/puma.sock?backlog=512'

SSL cert

bind 'ssl://127.0.0.1:9292?key=key.key&cert=cert.pem'

Disable optimization for low latency

bind 'tcp://0.0.0.0:9292?low_latency=false'

Socket permissions

bind 'unix:///var/run/puma.sock?umask=0111'

See Also:

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 185

def bind(url)
  @options[:binds] ||= []
  @options[:binds] << url
end

#bind_to_activated_sockets(bind = true)

Bind to (systemd) activated sockets, regardless of configured binds.

Systemd can present sockets as file descriptors that are already opened. By default ::Puma will use these but only if it was explicitly told to bind to the socket. If not, it will close the activated sockets. This means all configuration is duplicated.

Binds can contain additional configuration, but only SSL config is really relevant since the unix and TCP socket options are ignored.

This means there is a lot of duplicated configuration for no additional value in most setups. This method tells the launcher to bind to all activated sockets, regardless of existing bind.

To clear configured binds, the value only can be passed. This will clear out any binds that may have been configured.

Examples:

Use any systemd activated sockets as well as configured binds

bind_to_activated_sockets

Only bind to systemd activated sockets, ignoring other binds

bind_to_activated_sockets 'only'
[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 216

def bind_to_activated_sockets(bind=true)
  @options[:bind_to_activated_sockets] = bind
end

#clean_thread_locals(which = true)

Work around leaky apps that leave garbage in Thread locals across requests.

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 243

def clean_thread_locals(which=true)
  @options[:clean_thread_locals] = which
end

#clear_binds!

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 190

def clear_binds!
  @options[:binds] = []
end

#debug

Show debugging info

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 336

def debug
  @options[:debug] = true
end

#default_host

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 68

def default_host
  @options[:default_host] || Configuration::DefaultTCPHost
end

#directory(dir)

The directory to operate out of.

The default is the current directory.

Examples:

directory '/u/apps/lolcat'
[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 585

def directory(dir)
  @options[:directory] = dir.to_s
end

#drain_on_shutdown(which = true)

When shutting down, drain the accept socket of pending connections and process them. This loops over the accept socket until there are no more read events and then stops looking and waits for the requests to finish.

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 252

def drain_on_shutdown(which=true)
  @options[:drain_on_shutdown] = which
end

#early_hints(answer = true)

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 350

def early_hints(answer=true)
  @options[:early_hints] = answer
end

#environment(environment)

Set the environment in which the rack's app will run. The value must be a string.

The default is “development”.

Examples:

environment 'production'
[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 263

def environment(environment)
  @options[:environment] = environment
end

#extra_runtime_dependencies(answer = [])

When using prune_bundler, if extra runtime dependencies need to be loaded to initialize your app, then this setting can be used. This includes any ::Puma plugins.

Before bundler is pruned, the gem names supplied will be looked up in the bundler context and then loaded again after bundler is pruned. Only applies if prune_bundler is used.

Examples:

extra_runtime_dependencies ['gem_name_1', 'gem_name_2']
extra_runtime_dependencies ['puma_worker_killer', 'puma-heroku']

See Also:

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 662

def extra_runtime_dependencies(answer = [])
  @options[:extra_runtime_dependencies] = Array(answer)
end

#first_data_timeout(seconds)

Define how long the tcp socket stays open, if no data has been received.

See Also:

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 237

def first_data_timeout(seconds)
  @options[:first_data_timeout] = Integer(seconds)
end

#force_shutdown_after(val = :forever)

How long to wait for threads to stop when shutting them down. Defaults to :forever. Specifying :immediately will cause ::Puma to kill the threads immediately. Otherwise the value is the number of seconds to wait.

::Puma always waits a few seconds after killing a thread for it to try to finish up it's work, even in :immediately mode.

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 275

def force_shutdown_after(val=:forever)
  i = case val
      when :forever
        -1
      when :immediately
        0
      else
        Float(val)
      end

  @options[:force_shutdown_after] = i
end

#fork_worker(after_requests = 1000)

Note:

Cluster mode only.

When enabled, workers will be forked from worker 0 instead of from the master process. This option is similar to preload_app because the app is preloaded before forking, but it is compatible with phased restart.

This option also enables the refork command (SIGURG), which optimizes copy-on-write performance in a running app.

A refork will automatically trigger once after the specified number of requests (default 1000), or pass 0 to disable auto refork.

Version:

  • 5.0.0

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 819

def fork_worker(after_requests=1000)
  @options[:fork_worker] = Integer(after_requests)
end

#get(key, default = nil)

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 76

def get(key,default=nil)
  @options[key.to_sym] || default
end

#inject(&blk)

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 72

def inject(&blk)
  instance_eval(&blk)
end

#load(file)

Load additional configuration from a file Files get loaded later via Configuration#load

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 154

def load(file)
  @options[:config_files] ||= []
  @options[:config_files] << file
end

#log_formatter(&block)

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 367

def log_formatter(&block)
  @options[:log_formatter] = block
end

#log_requests(which = true)

Enable request logging

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 330

def log_requests(which=true)
  @options[:log_requests] = which
end

#lowlevel_error_handler(obj = nil, &block)

Use obj or block as the low level error handler. This allows the configuration file to change the default error on the server.

Examples:

lowlevel_error_handler do |err|
  [200, {}, ["error page"]]
end
[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 606

def lowlevel_error_handler(obj=nil, &block)
  obj ||= block
  raise "Provide either a #call'able or a block" unless obj
  @options[:lowlevel_error_handler] = obj
end

#max_fast_inline(num_of_requests)

The number of requests to attempt inline before sending a client back to the reactor to be subject to normal ordering.

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 843

def max_fast_inline(num_of_requests)
  @options[:max_fast_inline] = Float(num_of_requests)
end

#nakayoshi_fork(enabled = true)

When enabled, ::Puma will GC 4 times before forking workers. If available (Ruby 2.7+), we will also call GC.compact. Not recommended for non-MRI Rubies.

Based on the work of Koichi Sasada and Aaron Patterson, this option may decrease memory utilization of preload-enabled cluster-mode Pumas. It will also increase time to boot and fork. See your logs for details on how much time this adds to your boot process. For most apps, it will be less than one second.

See Also:

  • Puma::Cluster#nakayoshi_gc

Version:

  • 5.0.0

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 836

def nakayoshi_fork(enabled=true)
  @options[:nakayoshi_fork] = enabled
end

#on_refork(&block)

Note:

Cluster mode with #fork_worker enabled only.

When #fork_worker is enabled, code to run in Worker 0 before all other workers are re-forked from this process, after the server has temporarily stopped serving requests (once per complete refork cycle).

This can be used to trigger extra garbage-collection to maximize copy-on-write efficiency, or close any connections to remote servers (database, Redis, …) that were opened while the server was running.

This can be called multiple times to add several hooks.

Examples:

on_refork do
  3.times {GC.start}
end

Version:

  • 5.0.0

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 560

def on_refork(&block)
  @options[:before_refork] ||= []
  @options[:before_refork] << block
end

#on_restart(&block)

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.

Examples:

on_restart do
  puts 'On restart...'
end
[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 297

def on_restart(&block)
  @options[:on_restart] ||= []
  @options[:on_restart] << block
end

#on_worker_boot(&block)

Note:

Cluster mode only.

Code to run in a worker when it boots to setup the process before booting the app.

This can be called multiple times to add several hooks.

Examples:

on_worker_boot do
  puts 'Before worker boot...'
end
[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 488

def on_worker_boot(&block)
  @options[:before_worker_boot] ||= []
  @options[:before_worker_boot] << block
end

#on_worker_fork(&block)

Note:

Cluster mode only.

Code to run in the master right before a worker is started. The worker's index is passed as an argument.

This can be called multiple times to add several hooks.

Examples:

on_worker_fork do
  puts 'Before worker fork...'
end
[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 520

def on_worker_fork(&block)
  @options[:before_worker_fork] ||= []
  @options[:before_worker_fork] << block
end

#on_worker_shutdown(&block)

Note:

Cluster mode only.

Code to run immediately before a worker shuts down (after it has finished processing HTTP requests). These hooks can block if necessary to wait for background operations unknown to ::Puma to finish before the process terminates.

This can be called multiple times to add several hooks.

Examples:

on_worker_shutdown do
  puts 'On worker shutdown...'
end
[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 505

def on_worker_shutdown(&block)
  @options[:before_worker_shutdown] ||= []
  @options[:before_worker_shutdown] << block
end

#out_of_band(&block)

Code to run out-of-band when the worker is idle. These hooks run immediately after a request has finished processing and there are no busy threads on the worker. The worker doesn't accept new requests until this code finishes.

This hook is useful for running out-of-band garbage collection or scheduling asynchronous tasks to execute after a response.

This can be called multiple times to add several hooks.

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 574

def out_of_band(&block)
  @options[:out_of_band] ||= []
  @options[:out_of_band] << block
end

#persistent_timeout(seconds)

Define how long persistent connections can be idle before ::Puma closes them.

See Also:

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 231

def persistent_timeout(seconds)
  @options[:persistent_timeout] = Integer(seconds)
end

#pidfile(path)

Store the pid of the server in the file at “path”.

Examples:

pidfile '/u/apps/lolcat/tmp/pids/puma.pid'
[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 316

def pidfile(path)
  @options[:pidfile] = path.to_s
end

#plugin(name)

Load the named plugin for use by this configuration

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 82

def plugin(name)
  @plugins << @config.load_plugin(name)
end

#port(port, host = nil)

Define the TCP port to bind to. Use #bind for more advanced options.

Examples:

port 9292
[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 224

def port(port, host=nil)
  host ||= default_host
  bind "tcp://#{host}:#{port}"
end

#preload_app!(answer = true)

Note:

Cluster mode only.

Preload the application before starting the workers; this conflicts with phased restart feature. On by default if your app uses more than 1 worker.

Examples:

preload_app!
[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 595

def preload_app!(answer=true)
  @options[:preload_app] = answer
end

#prune_bundler(answer = true)

Note:

This is incompatible with #preload_app!.

Note:

This is only supported for RubyGems 2.2+

This option is used to allow your app and its gems to be properly reloaded when not using preload.

When set, if ::Puma detects that it's been invoked in the context of Bundler, it will cleanup the environment and re-run itself outside the Bundler environment, but directly using the files that Bundler has setup.

This means that ::Puma is now decoupled from your Bundler context and when each worker loads, it will be loading a new Bundler context and thus can float around as the release dictates.

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 629

def prune_bundler(answer=true)
  @options[:prune_bundler] = answer
end

#queue_requests(answer = true)

When set to true (the default), workers accept all requests and queue them before passing them to the handlers. When set to false, each worker process accepts exactly as many requests as it is configured to simultaneously handle.

Queueing requests generally improves performance. In some cases, such as a single threaded application, it may be better to ensure requests get balanced across workers.

Note that setting this to false disables HTTP keepalive and slow clients will occupy a handler thread while the request is being sent. A reverse proxy, such as nginx, can handle slow clients and queue requests before they reach ::Puma.

See Also:

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 739

def queue_requests(answer=true)
  @options[:queue_requests] = answer
end

#quiet(which = true)

Disable request logging, if this isn't used it'll be enabled by default.

Examples:

quiet
[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 324

def quiet(which=true)
  @options[:log_requests] = !which
end

#rackup(path)

Load path as a rackup file.

The default is “config.ru”.

Examples:

rackup '/u/apps/lolcat/config.ru'
[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 346

def rackup(path)
  @options[:rackup] ||= path.to_s
end

#raise_exception_on_sigterm(answer = true)

By default, ::Puma will raise SignalException when SIGTERM is received. In environments where SIGTERM is something expected, you can suppress these with this option.

This can be useful for example in Kubernetes, where rolling restart is guaranteed usually on infrastructure level.

Examples:

raise_exception_on_sigterm false

See Also:

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 645

def raise_exception_on_sigterm(answer=true)
  @options[:raise_exception_on_sigterm] = answer
end

#restart_command(cmd)

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.

Examples:

restart_command '/u/app/lolcat/bin/restart_puma'
[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 308

def restart_command(cmd)
  @options[:restart_cmd] = cmd.to_s
end

#set_default_host(host)

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 64

def set_default_host(host)
  @options[:default_host] = host
end

#set_remote_address(val = :socket)

Control how the remote address of the connection is set. This is configurable because to calculate the true socket peer address a kernel syscall is required which for very fast rack handlers slows down the handling significantly.

There are 4 possible values:

  1. *:socket* (the default) - read the peername from the socket using the syscall. This is the normal behavior.

  2. *:localhost* - set the remote address to “127.0.0.1”

  3. **header: <http_header>**- set the remote address to the value of the provided http header. For instance: `set_remote_address header: “X-Real-IP”`. Only the first word (as separated by spaces or comma) is used, allowing headers such as X-Forwarded-For to be used as well.

  4. **<Any string>** - this allows you to hardcode remote address to any value you wish. Because Puma never uses this field anyway, it's format is entirely in your hands.

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 784

def set_remote_address(val=:socket)
  case val
  when :socket
    @options[:remote_address] = val
  when :localhost
    @options[:remote_address] = :value
    @options[:remote_address_value] = "127.0.0.1".freeze
  when String
    @options[:remote_address] = :value
    @options[:remote_address_value] = val
  when Hash
    if hdr = val[:header]
      @options[:remote_address] = :header
      @options[:remote_address_header] = "HTTP_" + hdr.upcase.tr("-", "_")
    else
      raise "Invalid value for set_remote_address - #{val.inspect}"
    end
  else
    raise "Invalid value for set_remote_address - #{val}"
  end
end

#shutdown_debug(val = true)

When a shutdown is requested, the backtraces of all the threads will be written to $stdout. This can help figure out why shutdown is hanging.

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 747

def shutdown_debug(val=true)
  @options[:shutdown_debug] = val
end

#ssl_bind(host, port, opts)

Instead of bind 'ssl://127.0.0.1:9292?key=key_path&cert=cert_path' you can also use the this method.

Examples:

ssl_bind '127.0.0.1', '9292', {
  cert: path_to_cert,
  key: path_to_key,
  ssl_cipher_filter: cipher_filter, # optional
  verify_mode: verify_mode,         # default 'none'
}

For JRuby additional keys are required: keystore & keystore_pass.

ssl_bind '127.0.0.1', '9292', {
  cert: path_to_cert,
  key: path_to_key,
  ssl_cipher_filter: cipher_filter, # optional
  verify_mode: verify_mode,         # default 'none'
  keystore: path_to_keystore,
  keystore_pass: password
}
[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 414

def ssl_bind(host, port, opts)
  verify = opts.fetch(:verify_mode, 'none').to_s
  no_tlsv1 = opts.fetch(:no_tlsv1, 'false')
  no_tlsv1_1 = opts.fetch(:no_tlsv1_1, 'false')
  ca_additions = "&ca=#{opts[:ca]}" if ['peer', 'force_peer'].include?(verify)

  if defined?(JRUBY_VERSION)
    keystore_additions = "keystore=#{opts[:keystore]}&keystore-pass=#{opts[:keystore_pass]}"
    bind "ssl://#{host}:#{port}?cert=#{opts[:cert]}&key=#{opts[:key]}&#{keystore_additions}&verify_mode=#{verify}&no_tlsv1=#{no_tlsv1}&no_tlsv1_1=#{no_tlsv1_1}#{ca_additions}"
  else
    ssl_cipher_filter = "&ssl_cipher_filter=#{opts[:ssl_cipher_filter]}" if opts[:ssl_cipher_filter]
    bind "ssl://#{host}:#{port}?cert=#{opts[:cert]}&key=#{opts[:key]}#{ssl_cipher_filter}&verify_mode=#{verify}&no_tlsv1=#{no_tlsv1}&no_tlsv1_1=#{no_tlsv1_1}#{ca_additions}"
  end
end

#state_path(path)

Use path as the file to store the server info state. This is used by pumactl to query and control the server.

Examples:

state_path '/u/apps/lolcat/tmp/pids/puma.state'
[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 434

def state_path(path)
  @options[:state] = path.to_s
end

#state_permission(permission)

Use permission to restrict permissions for the state file.

Examples:

state_permission 0600

Version:

  • 5.0.0

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 444

def state_permission(permission)
  @options[:state_permission] = permission
end

#stdout_redirect(stdout = nil, stderr = nil, append = false)

Redirect STDOUT and STDERR to files specified. The append parameter specifies whether the output is appended, the default is false.

Examples:

stdout_redirect '/app/lolcat/log/stdout', '/app/lolcat/log/stderr'
stdout_redirect '/app/lolcat/log/stdout', '/app/lolcat/log/stderr', true
[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 361

def stdout_redirect(stdout=nil, stderr=nil, append=false)
  @options[:redirect_stdout] = stdout
  @options[:redirect_stderr] = stderr
  @options[:redirect_append] = append
end

#tag(string)

Additional text to display in process listing.

If you do not specify a tag, ::Puma will infer it. If you do not want ::Puma to add a tag, use an empty string.

Examples:

tag 'app name'
tag ''
[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 675

def tag(string)
  @options[:tag] = string.to_s
end

#threads(min, max)

Configure min to be the minimum number of threads to use to answer requests and max the maximum.

The default is “0, 16”.

Examples:

threads 0, 16
threads 5, 5
[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 380

def threads(min, max)
  min = Integer(min)
  max = Integer(max)
  if min > max
    raise "The minimum (#{min}) number of threads must be less than or equal to the max (#{max})"
  end

  if max < 1
    raise "The maximum number of threads (#{max}) must be greater than 0"
  end

  @options[:min_threads] = min
  @options[:max_threads] = max
end

#wait_for_less_busy_worker(val = 0.005)

Attempts to route traffic to less-busy workers by causing them to delay listening on the socket, allowing workers which are not processing any requests to pick up new requests first.

Only works on MRI. For all other interpreters, this setting does nothing.

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 761

def wait_for_less_busy_worker(val=0.005)
  @options[:wait_for_less_busy_worker] = val.to_f
end

#worker_boot_timeout(timeout)

Note:

Cluster mode only.

Change the default worker timeout for booting.

If unspecified, this defaults to the value of worker_timeout.

Examples:

worker_boot_timeout 60

See Also:

  • Puma::Cluster::Worker#ping_timeout
[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 712

def worker_boot_timeout(timeout)
  @options[:worker_boot_timeout] = Integer(timeout)
end

#worker_shutdown_timeout(timeout)

Note:

Cluster mode only.

Set the timeout for worker shutdown.

See Also:

  • Puma::Cluster::Worker#term
[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 721

def worker_shutdown_timeout(timeout)
  @options[:worker_shutdown_timeout] = Integer(timeout)
end

#worker_timeout(timeout)

Note:

Cluster mode only.

Verifies that all workers have checked in to the master process within the given timeout. If not the worker process will be restarted. This is not a request timeout, it is to protect against a hung or dead process. Setting this value will not protect against slow requests.

The minimum value is 6 seconds, the default value is 60 seconds.

Examples:

worker_timeout 60

See Also:

  • Puma::Cluster::Worker#ping_timeout
[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 691

def worker_timeout(timeout)
  timeout = Integer(timeout)
  min = Const::WORKER_CHECK_INTERVAL

  if timeout <= min
    raise "The minimum worker_timeout must be greater than the worker reporting interval (#{min})"
  end

  @options[:worker_timeout] = timeout
end

#workers(count)

Note:

Cluster mode only.

How many worker processes to run. Typically this is set to the number of available cores.

The default is 0.

See Also:

[ GitHub ]

  
# File 'lib/puma/dsl.rb', line 455

def workers(count)
  @options[:workers] = count.to_i
end