squid

TLDR

Start squid

$ squid

Check configuration

$ squid -k parse

Reload configuration

$ squid -k reconfigure

Shutdown gracefully

$ squid -k shutdown

Show version

$ squid -v

Run in foreground

$ squid -N

Debug mode

$ squid -d [5]

Clear cache

$ squid -k rotate && rm -rf [/var/spool/squid/*] && squid -z

SYNOPSIS

squid [-k command] [-f config] [-N] [options]

squid is a caching HTTP proxy. It accelerates web access and provides content filtering.
Forward proxy serves client requests. Caches responses for faster repeat access.
Reverse proxy accelerates web servers. Offloads content delivery.
Access control lists filter traffic. Block sites, limit bandwidth, authenticate users.
Cache management optimizes storage. Disk and memory caching configurable.

PARAMETERS

-k COMMAND

Send command to running squid.

-f FILE

Configuration file.

-N

No daemon mode.

-d LEVEL

Debug level.

-z

Create swap directories.

-v

Show version.

COMMANDS

parse - Check config
reconfigure - Reload config
shutdown - Graceful stop
interrupt - Immediate stop
rotate - Rotate logs

CAVEATS

Configuration is complex. ACL order matters. HTTPS interception needs certificates.

HISTORY

Squid originated from the Harvest project at the University of Colorado in 1996. It became the most widely deployed caching proxy.