Beach PHP

A Docker image providing PHP-FPM for Flownative Beach and Local Beach. Compared to other PHP images, this one is tailored to run without root privileges. All processes use an unprivileged user and much work has been put into providing proper console output and meaningful messages.

tl;dr

$ docker run flownative/beach-php

Usage

This image can be used in two scenarios:

• as a container as part of Local Beach or other Docker Compose setup
• as a container as part of Beach in a Kubernetes setup

You may be able to tweak this image to fit into other setups. Please make sure you understand the internals of this image before you try to do so.

Configuration

Logging

By default, the PHP logs are written to STDOUT / STDERR. That way, you can follow logs by watching container logs with docker logs or using a similar mechanism in Kubernetes or your actual platform.

Environment variables

Flow

Variable Name	Type	Default	Description
BEACH_WAIT_FOR_SYNC	boolean	false
BEACH_APPLICATION_USER_SERVICE_ENABLE	boolean	false	If user-defined services (beach-service*.sh) should be enabled
BEACH_APPLICATION_STARTUP_SCRIPTS_ENABLE	boolean	true	If standard startup scripts (doctrine migrate, resource publish etc.) should be run
BEACH_APPLICATION_CUSTOM_STARTUP_SCRIPTS_ENABLE	boolean	true	If custom startup scripts (beach-startup.sh) should be run
BEACH_FLOW_BASE_CONTEXT	string	Production	Base context, either "Development" or "Production"
BEACH_FLOW_SUB_CONTEXT	string	Instance	Sub context
BEACH_FLOW_CONTEXT	string	Production/Beach/Instance	(read-only) The actual Flow context; pattern: "{…BASE_CONTEXT}/Beach/{…SUB_CONTEXT}"
BEACH_ENVIRONMENT_VARIABLES_ALLOW_LIST	string		If set, only these environment variables are promoted to the "beach" user's shell
BEACH_CRON_ENABLE	boolean	false	If user-defined cron-jobs (beach-cron-hourly.sh) should be enabled

SSHD

Variable Name	Type	Default	Description
SSHD_ENABLE	boolean	false	If the SSH daemon should be enabled
SSHD_BASE_PATH	string	/opt/flownative/sshd	Base path of SSHD (read-only)
SSHD_HOST_KEYS_PATH	string	/opt/flownative/sshd/etc	Path where to store SSH host keys
SSHD_AUTHORIZED_KEYS_SERVICE_ENDPOINT	string	http://beach-controlpanel.beach-system.svc.cluster.local/api/v1	URL of the Beach SSH authorized keys service endpoint

PROMETHEUS METRICS

Variable Name	Type	Default	Description
METRICS_PHP_FPM_ENABLE	boolean	false	If PHP-FPM metrics should be exported
METRICS_PHP_FPM_SCRAPE_URI	string	tcp://127.0.0.1:9000/php-fpm-status	FastCGI address pointing to the PHP-FPM status page
METRICS_PHP_FPM_LISTEN_ADDRESS	string	127.0.0.1:9002	Host and port the PHP-FPM exporter listens to for scraping metrics
METRICS_PHP_FPM_TELEMETRY_PATH	string	/metrics	Path at which PHP-FPM exporter listens to for scraping metrics

Blackfire

Variable Name	Type	Default	Description
BEACH_ADDON_BLACKFIRE_ENABLE	boolean	false	Enables the Blackfire probe extension
BEACH_ADDON_BLACKFIRE_SERVER_ID	string		Server id to authenticate with Blackfire
BEACH_ADDON_BLACKFIRE_SERVER_TOKEN	string		Server token to authenticate with Blackfire

Beach

Variable Name	Type	Default	Description
BEACH_INSTANCE_IDENTIFIER	string		The Beach instance identifier
BEACH_INSTANCE_NAME	string		The Beach instance name
BEACH_PROJECT_NAME	string		The Beach project name

Sitemap Crawler

Variable Name	Type	Default	Description
SITEMAP_CRAWLER_ENABLE	boolean	false	Enables the Sitemap Crawler
SITEMAP_CRAWLER_SITEMAP_URL	string	http://localhost:8080/sitemap.xml	URL to retrieve the sitemap from; can be a comma separated list of multiple URLs
SITEMAP_CRAWLER_INTERNAL_BASE_URL	string	http://localhost:8080	Internal base URL for crawling the site

Deprecated

These variables are handled for reasons of backwards-compatibility. Please avoid using them, as they will be removed once Flownative Beach has fully migrated to the new configuration options.

Variable Name	Type	Default	Description
BEACH_PHP_TIMEZONE	string		Sets PHP_DATE_TIMEZONE
BEACH_PHP_MEMORY_LIMIT	string		Sets PHP_MEMORY_LIMIT

Included tools

This image provides a few tools to SSH user, so they have an easier time debugging typical issues, such as connection problems or misconfiguration.

The included tools are:

Name	Command	Description
vim	vi / vim	Text editor
cURL	curl	Data transfer agent for HTTP(S), FTP and more
MariaDB	mysql	MySQL client, including tools like mysqldump and mysqlimport
Netcat	nc	Universal TCP and UDP tool
Ghostscript	gs	Used for thumbnail rendering in Neos

Image optimization tools

In order to support image optimization for websites, the following tools are available:

Format	Commands
GIF	gifsicle, gifdiff, gifview
PNG	optipng, pngcrush, pngquant
JPEG	jpegoptim, cjpeg, djpeg, exifautotran, jpegexiforient, jpegtran, rdjpgcom, tjbench, wrjpgcom
WebP	cwebp, dwebp, gif2webp, img2webp, vwebp, webpinfo, webpmux

Cron

This image contains a very simple and naïve implementation for running a script on a regular basis. When the feature is enabled using the environment variable BEACH_CRON_ENABLE, a daemon will check if there's a script called /application/beach-cron-hourly.sh and if it exists, calls the script once every hour.

Since this type of traditional cron-jobs does not fit very well into container setups like Kubernetes, this feature is only a temporary solution.

SSHD

This image contains SSHD, the OpenSSH SSH daemon. The configuration of the SSH server is tailored to Flownative Beach and won't work with other environments out of the box.

SSH support is disabled by default and can be enabled by setting the environment variable SSHD_ENABLE to true.

In order to run SSHD with an unprivileged user, the daemon is configured to listen on a non-privileged port (2022).

SSHD is configured to use a custom authorized keys script which authenticates connecting users. The script passes the Beach instance identifier to a REST service specified in SSHD_AUTHORIZED_KEYS_SERVICE_ENDPOINT and receives a list of authorized public keys in return. If the public key of the current client can be found in that list, access is granted.

Only connections as user "beach" using public key authentication are accepted. Connections as "root" or with authentication via password are rejected.

Security aspects

This image is designed to run as a non-root container. Using an unprivileged user generally improves the security of an image, but may have a few side-effects, especially when you try to debug something by logging in to the container using docker exec.

When you are running this image with Docker or in a Kubernetes context, you can take advantage of the non-root approach by disallowing privilege escalation:

$ docker run flownative/beach-php:7.4 --security-opt=no-new-privileges

Building this image

Build this image with docker build. You need to specify the desired version of flownative/php, which this image is derived from:

docker build \
    --build-arg PHP_BASE_IMAGE=flownative/php:7.4.3 \
    -t flownative/beach-php:7.4.3 .