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Varnish Cache

Varnish is a powerful, flexible HTTP accelerator that speeds up web applications by caching content and optimizing delivery.

For agents: Varnish Cache is an open HTTP accelerator; docs cover installing on Docker, Kubernetes, Debian and RHEL, plus a VSL logging cheatsheet.

varnish cachehttp acceleratorreverse proxyinstall guidevsl logging

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# Varnish Cache

> Varnish is a powerful, flexible HTTP accelerator that speeds up web applications by caching content and optimizing delivery.

Varnish Cache is an open source HTTP accelerator (reverse caching proxy) maintained by Varnish Software. It is a downstream distribution of Vinyl Cache, delivering a stable release with additional tooling and features. You install it in front of any HTTP server to cache responses, typically speeding up delivery by 300-1000x.

## Key Facts

- Type: Open source reverse caching proxy / HTTP accelerator
- License: BSD 2-Clause
- Maintained by: Varnish Software
- Based on: Vinyl Cache (upstream open source project)
- Language: C, with VCL (Varnish Configuration Language) for configuration
- Website: https://www.varnish.org/

## Key Features

- Extremely fast and scalable HTTP caching
- Built-in VCL programming language for custom caching policies
- Follows HTTP caching conventions (Cache-Control, stale-while-revalidate via grace)
- Extensive metrics and logs for complete observability
- Dynamic backends with SSL support (via vmod-reqwest)
- 19+ bundled VMODs (modules) for rate limiting, GeoIP, Redis, JSON parsing, and more
- Deployable via Docker, Kubernetes (Helm), DEB and RPM packages

## Varnish vs Varnish Cache

"Varnish" refers to the complete technology ecosystem including Varnish Cache (open source), Varnish Enterprise (commercial), and related tools. "Varnish Cache" specifically refers to the open source distribution.

## Documentation

- [Docker install guide](https://www.varnish.org/docs/install-guide/install-docker/) - Learn how to run Varnish Cache on Docker.
- [Kubernetes install guide](https://www.varnish.org/docs/install-guide/install-kubernetes/) - Learn how to run Varnish Cache on Kubernetes using the official Helm chart.
- [Debian and Ubuntu install guide](https://www.varnish.org/docs/install-guide/install-debian-ubuntu/) - Learn how to install Varnish Cache on Debian and Ubuntu
- [Red Hat Enterprise Linux and compatible distributions install guide](https://www.varnish.org/docs/install-guide/install-rhel-compatible/) - Learn how to install Varnish Cache on Red Hat Enterprise Linux and compatible distributions.
- [VSL cheatsheet](https://www.varnish.org/docs/tutorials/vsl-cheatsheet/) - varnishlog, varnishncsa and ready-to-use VSL queries
- [Mixed content and ERR_TOO_MANY_REDIRECTS errors in WordPress when using Varnish](https://www.varnish.org/docs/tutorials/mixed-content-err-too-many-redirects-wordpress-varnish/) - Fixing mixed content issues and avoiding the ERR_TOO_MANY_REDIRECTS error in WordPress when using Varnish.
- [HTTP caching basics](https://www.varnish.org/docs/tutorials/http-caching-basics/) - Learn the basics of HTTP caching and learn how to control the behavior of a web cache by using conventional HTTP headers
- [Bypassing the cache for specific URL patterns](https://www.varnish.org/docs/tutorials/bypass-cache-urls/) - How to bypass the cache for specific URLs and URL patterns
…

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