Mojo::Server::Hypnotoad

Section: User Contributed Perl Documentation (3)
Updated: 2019-01-02
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NAME

Mojo::Server::Hypnotoad - A production web serv...ALL GLORY TO THE HYPNOTOAD!  

SYNOPSIS

  use Mojo::Server::Hypnotoad;

  my $hypnotoad = Mojo::Server::Hypnotoad->new;
  $hypnotoad->run('/home/sri/myapp.pl');

 

DESCRIPTION

Mojo::Server::Hypnotoad is a full featured, UNIX optimized, pre-forking non-blocking I/O HTTP and WebSocket server, built around the very well tested and reliable Mojo::Server::Prefork, with IPv6, TLS, SNI, UNIX domain socket, Comet (long polling), keep-alive, multiple event loop and hot deployment support that just works. Note that the server uses signals for process management, so you should avoid modifying signal handlers in your applications.

To start applications with it you can use the hypnotoad script, which listens on port 8080, automatically daemonizes the server process and defaults to "production" mode for Mojolicious and Mojolicious::Lite applications.

  $ hypnotoad ./myapp.pl

You can run the same command again for automatic hot deployment.

  $ hypnotoad ./myapp.pl
  Starting hot deployment for Hypnotoad server 31841.

This second invocation will load the application again, detect the process id file with it, and send a ``USR2'' signal to the already running server.

For better scalability (epoll, kqueue) and to provide non-blocking name resolution, SOCKS5 as well as TLS support, the optional modules EV (4.0+), Net::DNS::Native (0.15+), IO::Socket::Socks (0.64+) and IO::Socket::SSL (2.009+) will be used automatically if possible. Individual features can also be disabled with the "MOJO_NO_NNR", "MOJO_NO_SOCKS" and "MOJO_NO_TLS" environment variables.

See ``DEPLOYMENT'' in Mojolicious::Guides::Cookbook for more.  

MANAGER SIGNALS

The Mojo::Server::Hypnotoad manager process can be controlled at runtime with the following signals.  

INT, TERM

Shut down server immediately.  

QUIT

Shut down server gracefully.  

TTIN

Increase worker pool by one.  

TTOU

Decrease worker pool by one.  

USR2

Attempt zero downtime software upgrade (hot deployment) without losing any incoming connections.

  Manager (old)
  |- Worker [1]
  |- Worker [2]
  |- Worker [3]
  |- Worker [4]
  +- Manager (new)
     |- Worker [1]
     |- Worker [2]
     |- Worker [3]
     +- Worker [4]

The new manager will automatically send a ``QUIT'' signal to the old manager and take over serving requests after starting up successfully.  

WORKER SIGNALS

Mojo::Server::Hypnotoad worker processes can be controlled at runtime with the following signals.  

QUIT

Stop worker gracefully.  

SETTINGS

Mojo::Server::Hypnotoad can be configured with the following settings, see ``Hypnotoad'' in Mojolicious::Guides::Cookbook for examples.  

accepts

  accepts => 100

Maximum number of connections a worker is allowed to accept, before stopping gracefully and then getting replaced with a newly started worker, defaults to the value of ``accepts'' in Mojo::Server::Prefork. Setting the value to 0 will allow workers to accept new connections indefinitely. Note that up to half of this value can be subtracted randomly to improve load balancing, and to make sure that not all workers restart at the same time.  

backlog

  backlog => 128

Listen backlog size, defaults to the value of ``backlog'' in Mojo::Server::Daemon.  

clients

  clients => 100

Maximum number of accepted connections each worker process is allowed to handle concurrently, before stopping to accept new incoming connections, defaults to the value of ``max_connections'' in Mojo::IOLoop. Note that high concurrency works best with applications that perform mostly non-blocking operations, to optimize for blocking operations you can decrease this value and increase ``workers'' instead for better performance.  

graceful_timeout

  graceful_timeout => 15

Maximum amount of time in seconds stopping a worker gracefully may take before being forced, defaults to the value of ``graceful_timeout'' in Mojo::Server::Prefork. Note that this value should usually be a little larger than the maximum amount of time you expect any one request to take.  

heartbeat_interval

  heartbeat_interval => 3

Heartbeat interval in seconds, defaults to the value of ``heartbeat_interval'' in Mojo::Server::Prefork.  

heartbeat_timeout

  heartbeat_timeout => 2

Maximum amount of time in seconds before a worker without a heartbeat will be stopped gracefully, defaults to the value of ``heartbeat_timeout'' in Mojo::Server::Prefork. Note that this value should usually be a little larger than the maximum amount of time you expect any one operation to block the event loop.  

inactivity_timeout

  inactivity_timeout => 10

Maximum amount of time in seconds a connection can be inactive before getting closed, defaults to the value of ``inactivity_timeout'' in Mojo::Server::Daemon. Setting the value to 0 will allow connections to be inactive indefinitely.  

listen

  listen => ['http://*:80']

Array reference with one or more locations to listen on, defaults to "http://*:8080". See also ``listen'' in Mojo::Server::Daemon for more examples.  

pid_file

  pid_file => '/var/run/hypnotoad.pid'

Full path to process id file, defaults to "hypnotoad.pid" in the same directory as the application. Note that this value can only be changed after the server has been stopped.  

proxy

  proxy => 1

Activate reverse proxy support, which allows for the "X-Forwarded-For" and "X-Forwarded-Proto" headers to be picked up automatically, defaults to the value of ``reverse_proxy'' in Mojo::Server.  

requests

  requests => 50

Number of keep-alive requests per connection, defaults to the value of ``max_requests'' in Mojo::Server::Daemon.  

spare

  spare => 4

Temporarily spawn up to this number of additional workers if there is a need, defaults to the value of ``spare'' in Mojo::Server::Prefork. This allows for new workers to be started while old ones are still shutting down gracefully, drastically reducing the performance cost of worker restarts.  

upgrade_timeout

  upgrade_timeout => 45

Maximum amount of time in seconds a zero downtime software upgrade may take before getting canceled, defaults to 180.  

workers

  workers => 10

Number of worker processes, defaults to the value of ``workers'' in Mojo::Server::Prefork. A good rule of thumb is two worker processes per CPU core for applications that perform mostly non-blocking operations, blocking operations often require more and benefit from decreasing concurrency with ``clients'' (often as low as 1). Note that during zero downtime software upgrades there will be twice as many workers active for a short amount of time.  

ATTRIBUTES

Mojo::Server::Hypnotoad implements the following attributes.  

prefork

  my $prefork = $hypnotoad->prefork;
  $hypnotoad  = $hypnotoad->prefork(Mojo::Server::Prefork->new);

Mojo::Server::Prefork object this server manages.  

upgrade_timeout

  my $timeout = $hypnotoad->upgrade_timeout;
  $hypnotoad  = $hypnotoad->upgrade_timeout(15);

Maximum amount of time in seconds a zero downtime software upgrade may take before getting canceled, defaults to 180.  

METHODS

Mojo::Server::Hypnotoad inherits all methods from Mojo::Base and implements the following new ones.  

configure

  $hypnotoad->configure('hypnotoad');

Configure server from application settings.  

run

  $hypnotoad->run('script/my_app');

Run server for application and wait for ``MANAGER SIGNALS''.  

SEE ALSO

Mojolicious, Mojolicious::Guides, <https://mojolicious.org>.


 

Index

NAME
SYNOPSIS
DESCRIPTION
MANAGER SIGNALS
INT, TERM
QUIT
TTIN
TTOU
USR2
WORKER SIGNALS
QUIT
SETTINGS
accepts
backlog
clients
graceful_timeout
heartbeat_interval
heartbeat_timeout
inactivity_timeout
listen
pid_file
proxy
requests
spare
upgrade_timeout
workers
ATTRIBUTES
prefork
upgrade_timeout
METHODS
configure
run
SEE ALSO
LinuxReviews : manual page archive : man3pm