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Varnish HTTP reverse proxy and cache layer for DDEV

ddev-varnish 최신버젼 다운로드

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# DDEV Varnish

## Overview

[Varnish Cache](https://varnish-cache.org/) is a web application accelerator also known as a caching HTTP reverse proxy. You install it in front of any server that speaks HTTP and configure it to cache the contents. Varnish Cache is really, really fast. It typically speeds up delivery with a factor of 300 - 1000x, depending on your architecture.

This add-on integrates Varnish into your [DDEV](https://ddev.com/) project.

## Installation

```bash
ddev add-on get ddev/ddev-varnish
ddev restart
```

> [!NOTE]
> Run `ddev add-on get ddev/ddev-varnish` after changes in `name`, `additional_hostnames`, `additional_fqdns`, `project_tld`, the Mailpit ports, or `web_extra_exposed_ports` in `.ddev/config.yaml` so that `.ddev/docker-compose.varnish_extras.yaml` is regenerated.

After installation, make sure to commit the `.ddev` directory to version control.

## Usage

The Varnish service inserts itself between ddev-router and the web container for port 80/443 only. Mailpit and `web_extra_exposed_ports` continue to route directly to the web container, bypassing Varnish.

A `docker-compose.varnish_extras.yaml` file is generated on install which:

- Removes port 80 from the web container's `HTTP_EXPOSE` and `HTTPS_EXPOSE` so Varnish owns that traffic.
- Extends the Varnish container's `VIRTUAL_HOST` to also accept `novarnish.*` subdomains (e.g. `novarnish.mysite.ddev.site`). Requests to these subdomains are piped directly to the backend by VCL, bypassing the cache without adding Varnish headers — useful for comparing cached vs. uncached responses.

> [!NOTE]
> If you use a `project_tld` other than `ddev.site` or `additional_fqdns`, DDEV adds `/etc/hosts` entries for your project hostnames automatically, but not for `novarnish.*` subdomains. Add them manually: `ddev hostname novarnish.mysite.example.com 127.0.0.1`.

## Helper Commands

This add-on also providers several helper commands. These helpers allow developers to run Varnish commands from the host, however, the commands are actually run inside the Varnish container.

| Command                      | Description                                               |
|------------------------------|-----------------------------------------------------------|
| `ddev varnishd`              | Varnish-cli                                               |
| `ddev varnishadm`            | Control a running Varnish instance                        |
| `ddev varnishhist`           | Display Varnish request histogram                         |
| `ddev varnishlog`            | Display Varnish logs                                      |
| `ddev varnishncsa`           | Display Varnish logs in Apache / NCSA combined log format |
| `ddev varnishstat`           | Display Varnish Cache statistics                          |
| `ddev varnishtest`           | Test program for Varnish                                  |
| `ddev varnishtop`            | Display Varnish log entry ranking                         |
| `ddev varnish-config-reload` | Reloads the varnish current config to apply changes       |
| `ddev describe`              | View service status and used ports for Varnish            |
| `ddev ssh -s varnish`        | Go into the Varnish container shell                       |
| `ddev logs -s varnish`       | Check Varnish logs                                        |

See [The Varnish Reference Manual](https://varnish-cache.org/docs/6.0/reference/index.html) for more information about the commands, their flags, and their arguments.

## Advanced Customization

You may want to edit the `.ddev/varnish/default.vcl` to meet your needs. The default VCL pipes `novarnish.*` requests directly to the backend (no caching, no Varnish headers). Remember to remove `#ddev-generated` from the file if you want your changes preserved.

To change the Docker image:

```bash
ddev dotenv set .ddev/.env.varnish --varnish-docker-image=varnish:6.0
ddev add-on get ddev/ddev-varnish
ddev restart
```

Make sure to commit the `.ddev/.env.varnish` file to version control.

All customization options (use with caution):

| Variable                  | Flag                        | Default                                                                                                            |
|---------------------------|-----------------------------|--------------------------------------------------------------------------------------------------------------------|
| `VARNISH_DOCKER_IMAGE`    | `--varnish-docker-image`    | `varnish:6.0`                                                                                                      |
| `VARNISH_VARNISHD_PARAMS` | `--varnish-varnishd-params` | `-p http_max_hdr=1000 -p http_resp_hdr_len=1M -p http_resp_size=2M -p workspace_backend=3M -p workspace_client=3M` |

### VARNISH_VARNISHD_PARAMS

Allows modifying the varnish [startup parameters](https://varnish-cache.org/docs/6.0/reference/varnishd.html).

The provided defaults are set deliberately higher than what varnish usually defines.
The reason for this is that in development environments it is not uncommon to
have larger payloads either in HTML or HTTP-Headers. E.g. Drupals theme debugging
or cache tag handling.
Without increasing these limits, one might encounter hard to isolate errors like the following form nginx:
```
2025/07/15 09:01:01 [info] 1549#1549: *259 writev() failed (32: Broken pipe) while sending to client, client: 172.20.0.6, server: , request: "GET /en HTTP/1.1", upstream: "fastcgi://unix:/run/php-fpm.sock:", host: "myproject.ddev.site"
```

### Adding Varnish VMODs

Varnish [VMODs](https://www.varnish.org/docs/reference/vmod/) extend VCL with additional functions (e.g. hashing, header manipulation, rate limiting). To build a custom Varnish image with extra VMODs compiled in, copy [docker-compose.varnish_vmod.yaml](tests/testdata/docker-compose.varnish_vmod.yaml) into your project's `.ddev/` directory.

This override builds a custom Varnish image on top of `VARNISH_DOCKER_IMAGE` and compiles the VMODs listed in the `VARNISH_VMODS` environment variable (space-separated `owner/repo` GitHub references) using [`install-vmod`](https://github.com/varnish/toolbox/tree/main/install-vmod). By default, it builds `varnish/libvmod-digest` and `varnish/varnish-modules`.

```bash
curl -fsSL -o .ddev/docker-compose.varnish_vmod.yaml https://raw.githubusercontent.com/ddev/ddev-varnish/main/tests/testdata/docker-compose.varnish_vmod.yaml
ddev dotenv set .ddev/.env.varnish --varnish-vmods="varnish/libvmod-digest varnish/varnish-modules"
ddev restart
```

Make sure to commit `.ddev/docker-compose.varnish_vmod.yaml` and `.ddev/.env.varnish` to version control. Once installed, import the VMOD in `.ddev/varnish/default.vcl`, e.g. `import digest;`.

## Credits

**Maintained by [@jedubois](https://github.com/jedubois) and the [DDEV team](https://ddev.com/support-ddev/)**

**Based on the original [ddev-contrib recipe](https://github.com/ddev/ddev-contrib/tree/master/docker-compose-services/varnish) pioneered by [rikwillems](https://github.com/rikwillems)**

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