pixelfed/contrib/docker/README.md

# Pixelfed Docker images

## Runtimes

The Pixelfed Dockerfile support multiple target *runtimes* ([Apache](#apache), [Nginx + FPM](#nginx), and [fpm](#fpm)).

You can consider a *runtime* target as individual Dockerfiles, but instead, all of them are build from the same optimized Dockerfile, sharing +90% of their configuration and packages.

### Apache

Building a custom Pixelfed Docker image using Apache + mod_php can be achieved the following way.

#### docker build (Apache)

```shell
docker build \
 -f contrib/docker/Dockerfile \
 --target apache-runtime \
 --tag <docker hub user>/<docker hub repo> \
 .
```

#### docker compose (Apache)

```yaml
version: "3"

services:
  app:
    build:
      context: .
      dockerfile: contrib/docker/Dockerfile
      target: apache-runtime
```

### Nginx

Building a custom Pixelfed Docker image using nginx + FPM can be achieved the following way.

#### docker build (nginx)

```shell
docker build \
 -f contrib/docker/Dockerfile \
 --target nginx-runtime \
 --build-arg 'PHP_BASE_TYPE=fpm' \
 --tag <docker hub user>/<docker hub repo> \
 .
```

#### docker compose (nginx)

```yaml
version: "3"

services:
 app:
  build:
   context: .
   dockerfile: contrib/docker/Dockerfile
   target: nginx-runtime
   args:
     PHP_BASE_TYPE: fpm
```

### FPM

Building a custom Pixelfed Docker image using FPM (only) can be achieved the following way.

#### docker build (fpm)

```shell
docker build \
 -f contrib/docker/Dockerfile \
 --target fpm-runtime \
 --build-arg 'PHP_BASE_TYPE=fpm' \
 --tag <docker hub user>/<docker hub repo> \
 .
```

#### docker compose (fpm)

```yaml
version: "3"

services:
 app:
  build:
   context: .
   dockerfile: contrib/docker/Dockerfile
   target: fpm-runtime
   args:
     PHP_BASE_TYPE: fpm
```

## Build settings (arguments)

The Pixelfed Dockerfile utilizes [Docker Multi-stage builds](https://docs.docker.com/build/building/multi-stage/) and [Build arguments](https://docs.docker.com/build/guide/build-args/).

Using *build arguments* allow us to create a flexible and more maintainable Dockerfile, supporting [multiple runtimes](#runtimes) ([FPM](#fpm), [Nginx](#nginx), [Apache + mod_php](#apache)) and end-user flexibility without having to fork or copy the Dockerfile.

*Build arguments* can be configured using `--build-arg 'name=value'` for `docker build`, `docker compose build` and `docker buildx build`. For `docker-compose.yml` the `args` key for [`build`](https://docs.docker.com/compose/compose-file/compose-file-v3/#build) can be used.

### `PHP_VERSION`

The `PHP` version to use when building the runtime container.

Any valid Docker Hub PHP version is acceptable here, as long as it's [published to Docker Hub](https://hub.docker.com/_/php/tags)

**Example values**:

* `8` will use the latest version of PHP 8
* `8.1` will use the latest version of PHP 8.1
* `8.2.14` will use PHP 8.2.14
* `latest` will use whatever is the latest PHP version

**Default value**: `8.1`

### `PECL_EXTENSIONS`

PECL extensions to install via `pecl install`

Use [PECL_EXTENSIONS_EXTRA](#pecl_extensions_extra) if you want to add *additional* extenstions.

Only change this setting if you want to change the baseline extensions.

See the [`PECL extensions` documentation on Docker Hub](https://hub.docker.com/_/php) for more information.

**Default value**: `imagick redis`

### `PECL_EXTENSIONS_EXTRA`

Extra PECL extensions (separated by space) to install via `pecl install`

See the [`PECL extensions` documentation on Docker Hub](https://hub.docker.com/_/php) for more information.

**Default value**: `""`

### `PHP_EXTENSIONS`

PHP Extensions to install via `docker-php-ext-install`.

**NOTE:** use [`PHP_EXTENSIONS_EXTRA`](#php_extensions_extra) if you want to add *additional* extensions, only override this if you want to change the baseline extensions.

See the [`How to install more PHP extensions` documentation on Docker Hub](https://hub.docker.com/_/php) for more information

**Default value**: `intl bcmath zip pcntl exif curl gd`

### `PHP_EXTENSIONS_EXTRA`

Extra PHP Extensions (separated by space) to install via `docker-php-ext-install`.

See the [`How to install more PHP extensions` documentation on Docker Hub](https://hub.docker.com/_/php) for more information.

**Default value**: `""`

### `PHP_DATABASE_EXTENSIONS`

PHP database extensions to install.

By default we install both `pgsql` and `mysql` since it's more convinient (and adds very little build time! but can be overwritten here if required.

**Default value**: `pdo_pgsql pdo_mysql`

### `COMPOSER_VERSION`

The version of Composer to install.

Please see the [Docker Hub `composer` page](https://hub.docker.com/_/composer) for valid values.

**Default value**: `2.6`

### `APT_PACKAGES_EXTRA`

Extra APT packages (separated by space) that should be installed inside the image by `apt-get install`

**Default value**: `""`

### `NGINX_VERSION`

Version of `nginx` to when targeting [`nginx-runtime`](#nginx).

Please see the [Docker Hub `nginx` page](https://hub.docker.com/_/nginx) for available versions.

**Default value**: `1.25.3`

### `PHP_BASE_TYPE`

The `PHP` base image layer to use when building the runtime container.

When targeting

* [`apache-runtime`](#apache) use `apache`
* [`fpm-runtime`](#fpm) use `fpm`
* [`nginx-runtime`](#nginx) use `fpm`

**Valid values**:

* `apache`
* `fpm`
* `cli`

**Default value**: `apache`

### `PHP_DEBIAN_RELEASE`

The `Debian` Operation System version to use.

**Valid values**:

* `bullseye`
* `bookworm`

**Default value**: `bullseye`