The Varnish Reference Manual

The VCL language#

• VCL - The Varnish Configuration Language
• VCL Variables
• VCL Steps
• VCL backend configuration
• VCL backend health probe
• Varnish Processing States

A collection of VCL Design Patterns is available in addition to these reference manuals.

Bundled VMODs#

• VMOD blob - Utilities for the VCL blob type, encoding and decoding
• VMOD cookie - Varnish Cookie Module
• VMOD directors - Varnish Directors Module
• VMOD h2 - Module to control the built-in HTTP2 transport
• VMOD proxy - Varnish Module to extract TLV attributes from PROXYv2
• VMOD purge - Varnish Purge Module
• VMOD std - Varnish Standard Module
• VMOD unix - Utilities for Unix domain sockets

The CLI interface#

• VarnishAdm - Control program for Varnish
• CLI - The commands varnish understands

Logging and monitoring#

• VSL - The log records Varnish generates
• VSLQ - Filter/Query expressions for VSL
• VarnishLog - Logging raw VSL
• VarnishNCSA - Logging in NCSA format
• VarnishHist - Realtime response histogram display
• VarnishTop - Realtime activity display

Counters and statistics#

• VSC - The statistics Varnish collects
• VarnishStat - Watching and logging statistics

The Varnishd program#

• VarnishD - The program which does the actual work

Varnishtest#

• VTC - Language for writing test cases
• VarnishTest - execute test cases
• VMOD vtc - Utility module for varnishtest

For Developers & DevOps#

• Shell tricks
• VMODS - Extensions to VCL
• VEXT - Varnish Extensions
• VSM - Shared memory use
• VDIR - Backends & Directors
• VCLI - CLI protocol API

Code-book#

• VTLA - Varnish Three Letter Acronyms