nginx

nginx is an open source HTTP server, originally created to solve the 10,000 concurrent connections problem.

Features

server {} blocks represent individual virtual hosts, matched by a listen address and optional server_names.
Modules provide non-core functionality, and can either by statically built into the nginx binary or loaded as dynamic modules with load_module.

Signals can be sent either via the nginx -s switch or by sending them to a running nginx master process.

Action	`-s`	POSIX signals
Fast shutdown	`stop`	`TERM`, `INT`
Graceful shutdown (wait for workers to finish processing)	`quit`	`QUIT`
Gracefully shutdown worker processes	N/A	`WINCH`
Reload configuration	`reload`	`HUP`
Reopen log files	`reopen`	`USR1`
On-the-fly executable upgrade	N/A	`USR2`

It's also possible to directly signal worker processes, though ordinarily the master would coordinate this.

Action	POSIX signals
Fast shutdown	`TERM`, `INT`
Graceful shutdown	`QUIT`
Reopen log files	`USR1`
Terminate abnormally for debugging	`WINCH`

Normal directives have one value per-context, and values specified deeper in a nested structure will take precedence.
Array directives simply add a value to a set of values, leaving existing values in place.
Action directives immediately perform an action, halting processing of other conditions and actions.

Backlinks

Features