forked from mirror/pixelfed
281 lines
9.0 KiB
Markdown
281 lines
9.0 KiB
Markdown
# Pixelfed Docker images
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## Runtimes
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The Pixelfed Dockerfile support multiple target *runtimes* ([Apache](#apache), [Nginx + FPM](#nginx), and [fpm](#fpm)).
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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.
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### Apache
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Building a custom Pixelfed Docker image using Apache + mod_php can be achieved the following way.
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#### docker build (Apache)
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```shell
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docker build \
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-f contrib/docker/Dockerfile \
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--target apache-runtime \
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--tag <docker hub user>/<docker hub repo> \
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.
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```
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#### docker compose (Apache)
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```yaml
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version: "3"
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services:
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app:
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build:
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context: .
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dockerfile: contrib/docker/Dockerfile
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target: apache-runtime
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```
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### Nginx
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Building a custom Pixelfed Docker image using nginx + FPM can be achieved the following way.
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#### docker build (nginx)
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```shell
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docker build \
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-f contrib/docker/Dockerfile \
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--target nginx-runtime \
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--build-arg 'PHP_BASE_TYPE=fpm' \
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--tag <docker hub user>/<docker hub repo> \
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.
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```
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#### docker compose (nginx)
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```yaml
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version: "3"
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services:
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app:
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build:
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context: .
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dockerfile: contrib/docker/Dockerfile
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target: nginx-runtime
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args:
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PHP_BASE_TYPE: fpm
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```
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### FPM
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Building a custom Pixelfed Docker image using FPM (only) can be achieved the following way.
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#### docker build (fpm)
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```shell
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docker build \
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-f contrib/docker/Dockerfile \
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--target fpm-runtime \
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--build-arg 'PHP_BASE_TYPE=fpm' \
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--tag <docker hub user>/<docker hub repo> \
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.
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```
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#### docker compose (fpm)
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```yaml
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version: "3"
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services:
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app:
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build:
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context: .
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dockerfile: contrib/docker/Dockerfile
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target: fpm-runtime
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args:
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PHP_BASE_TYPE: fpm
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```
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## Customizing your `Dockerfile`
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### Running commands on container start
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#### Description
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When a Pixelfed container starts up, the [`ENTRYPOINT`](https://docs.docker.com/engine/reference/builder/#entrypoint) script will
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1. Search the `/docker/entrypoint.d/` directory for files and for each file (in lexical order).
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1. Check if the file is executable.
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1. If the file is not executable, print an error and exit the container.
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1. If the file has the extension `.envsh` the file will be [sourced](https://superuser.com/a/46146).
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1. If the file has the extension `.sh` the file will be run like a normal script.
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1. Any other file extension will log a warning and will be ignored.
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#### Included scripts
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* `/docker/entrypoint.d/04-defaults.envsh` calculates Docker container environment variables needed for [templating](#templating) configuration files.
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* `/docker/entrypoint.d/05-templating.sh` renders [template](#templating) configuration files.
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* `/docker/entrypoint.d/10-storage.sh` ensures Pixelfed storage related permissions and commands are run.
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* `/docker/entrypoint.d/20-horizon.sh` ensures [Laravel Horizon](https://laravel.com/docs/master/horizon) used by Pixelfed is configured
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* `/docker/entrypoint.d/30-cache.sh` ensures all Pixelfed caches (router, view, config) is warmed
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#### Disabling entrypoint or individual scripts
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To disable the entire entrypoint you can set the variable `ENTRYPOINT_SKIP=1`.
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To disable individual entrypoint scripts you can add the filename to the space (`" "`) separated variable `ENTRYPOINT_SKIP_SCRIPTS`. (example: `ENTRYPOINT_SKIP_SCRIPTS="10-storage.sh 30-cache.sh"`)
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### Templating
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The Docker container can do some basic templating (more like variable replacement) as part of the entrypoint scripts via [gomplate](https://docs.gomplate.ca/).
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Any file put in the `/docker/templates/` directory will be templated and written to the right directory.
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#### File path examples
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1. To template `/usr/local/etc/php/php.ini` in the container put the source file in `/docker/templates/usr/local/etc/php/php.ini`.
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1. To template `/a/fantastic/example.txt` in the container put the source file in `/docker/templates/a/fantastic/example.txt`.
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1. To template `/some/path/anywhere` in the container put the source file in `/docker/templates/a/fantastic/example.txt`.
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#### Available variables
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Variables available for templating are sourced (in order, so *last* source takes precedence) like this:
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1. `env:` in your `docker-compose.yml` or `-e` in your `docker run` / `docker compose run`
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1. Any exported variables in `.envsh` files loaded *before* `05-templating.sh` (e.g. any file with `04-`, `03-`, `02-`, `01-` or `00-` prefix)
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1. All key/value pairs in `/var/www/.env.docker`
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1. All key/value pairs in `/var/www/.env`
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#### Template guide 101
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Please see the [gomplate documentation](https://docs.gomplate.ca/) for a more comprehensive overview.
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The most frequent use-case you have is likely to print a environment variable (or a default value if it's missing), so this is how to do that:
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* `{{ getenv "VAR_NAME" }}` print an environment variable and **fail** if the variable is not set. ([docs](https://docs.gomplate.ca/functions/env/#envgetenv))
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* `{{ getenv "VAR_NAME" "default" }}` print an environment variable and print `default` if the variable is not set. ([docs](https://docs.gomplate.ca/functions/env/#envgetenv))
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The script will *fail* if you reference a variable that does not exist (and don't have a default value) in a template.
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Please see the
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* [gomplate syntax documentation](https://docs.gomplate.ca/syntax/)
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* [gomplate functions documentation](https://docs.gomplate.ca/functions/)
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## Build settings (arguments)
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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/).
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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.
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*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.
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### `PHP_VERSION`
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The `PHP` version to use when building the runtime container.
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Any valid Docker Hub PHP version is acceptable here, as long as it's [published to Docker Hub](https://hub.docker.com/_/php/tags)
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**Example values**:
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* `8` will use the latest version of PHP 8
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* `8.1` will use the latest version of PHP 8.1
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* `8.2.14` will use PHP 8.2.14
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* `latest` will use whatever is the latest PHP version
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**Default value**: `8.1`
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### `PHP_PECL_EXTENSIONS`
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PECL extensions to install via `pecl install`
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Use [PHP_PECL_EXTENSIONS_EXTRA](#php_pecl_extensions_extra) if you want to add *additional* extenstions.
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Only change this setting if you want to change the baseline extensions.
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See the [`PECL extensions` documentation on Docker Hub](https://hub.docker.com/_/php) for more information.
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**Default value**: `imagick redis`
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### `PHP_PECL_EXTENSIONS_EXTRA`
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Extra PECL extensions (separated by space) to install via `pecl install`
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See the [`PECL extensions` documentation on Docker Hub](https://hub.docker.com/_/php) for more information.
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**Default value**: `""`
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### `PHP_EXTENSIONS`
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PHP Extensions to install via `docker-php-ext-install`.
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**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.
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See the [`How to install more PHP extensions` documentation on Docker Hub](https://hub.docker.com/_/php) for more information
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**Default value**: `intl bcmath zip pcntl exif curl gd`
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### `PHP_EXTENSIONS_EXTRA`
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Extra PHP Extensions (separated by space) to install via `docker-php-ext-install`.
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See the [`How to install more PHP extensions` documentation on Docker Hub](https://hub.docker.com/_/php) for more information.
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**Default value**: `""`
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### `PHP_EXTENSIONS_DATABASE`
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PHP database extensions to install.
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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.
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**Default value**: `pdo_pgsql pdo_mysql pdo_sqlite`
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### `COMPOSER_VERSION`
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The version of Composer to install.
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Please see the [Docker Hub `composer` page](https://hub.docker.com/_/composer) for valid values.
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**Default value**: `2.6`
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### `APT_PACKAGES_EXTRA`
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Extra APT packages (separated by space) that should be installed inside the image by `apt-get install`
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**Default value**: `""`
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### `NGINX_VERSION`
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Version of `nginx` to when targeting [`nginx-runtime`](#nginx).
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Please see the [Docker Hub `nginx` page](https://hub.docker.com/_/nginx) for available versions.
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**Default value**: `1.25.3`
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### `PHP_BASE_TYPE`
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The `PHP` base image layer to use when building the runtime container.
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When targeting
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* [`apache-runtime`](#apache) use `apache`
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* [`fpm-runtime`](#fpm) use `fpm`
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* [`nginx-runtime`](#nginx) use `fpm`
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**Valid values**:
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* `apache`
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* `fpm`
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* `cli`
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**Default value**: `apache`
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### `PHP_DEBIAN_RELEASE`
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The `Debian` Operation System version to use.
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**Valid values**:
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* `bullseye`
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* `bookworm`
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**Default value**: `bullseye`
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