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What is ControlFreak? ===================== see also: - lib/ControlFreak/Tutorial.pod - lib/ControlFreak.pm (pod) ControlFreak's intent is to help you really control your (web) app (in production and in development) and your resources effectively. It's a process supervisor: - It fixes the mess of pid file management - It facilitates the roll-forward and backward of releases - It optionally controls the resources that your app needs (essentially sockets) and make these resources available to your app using a push model - ... and many other benefits like flexible logging/monitoring of everything It supervises any type of services. Examples: In Dev: - memcached - gearmand - perlbal - plack - workers - ddlockd In Prod: - gearman workers - schwartz workers - plack (web) workers) - (or, apache if you prefer) How does it work? ================= It is a pure Perl implementation consisting in: - a controlling process: cfkd, which runs an AnyEvent loop usually running in the background - a command line tool to talk to it: cfkctl - a configuration file (just a bunch of commands really) cfkd forks to start (exec) the services it controls. Optimally, cfkd binds sockets and share them with workers before forking (known as pre-fork module), it can also make you benefit from Copy On Write effect (sharing memory between all your workers for instance). At your command cfkd, restarts, stops, kills any service.