Docker structure for deploying to multiple environments

dcom.sh

#!/bin/sh

################################################################################
#     This is a super simple, flexible wrapper for docker-compose command.     #
################################################################################

ENV=${1:-prod}
BASE=$(pwd)
shift

COMPOSE=$(docker compose >/dev/null 2>&1 && echo 'docker compose' || echo 'docker-compose')
CONFIG=$([ -f $BASE/docker-compose.${ENV}.yml ] && echo $BASE/docker-compose.${ENV}.yml || echo $BASE/docker-compose.yml)
CMD="$COMPOSE -f $CONFIG $@"

################################################################################

echo "\nUsing services from ${CONFIG/$BASE\//}" >&1 && exec $CMD

docker-compose.debug.yml

version: "3"

services:
  db:
    extends:
      file: services.yml
      service: mysql

  cache:
    extends:
      file: services.yml
      service: redis

  web:
    extends:
      file: services.yml
      service: laravel
    ports:
      - 80:80
    links:
      - cache
      - db
    environment:
      - APP_ENV=debug
      - DATABASE_HOST=db
      - REDIS_HOST=cache
      - REDIS_PORT=6379
      - BLACKFIRE_LOG_LEVEL=2
      - BLACKFIRE_MEMORY_LIMIT=256
      - BLACKFIRE_CLIENT_ID=${BLACKFIRE_CLIENT_ID:-}
      - BLACKFIRE_CLIENT_TOKEN=${BLACKFIRE_CLIENT_TOKEN:-}
    volumes:
      - ./debug:/var/www/html:ro

  agent:
    extends:
      file: services.yml
      service: blackfire
    links:
      - web
    environment:
      - BLACKFIRE_CLIENT_ID=${BLACKFIRE_CLIENT_ID:-}
      - BLACKFIRE_CLIENT_TOKEN=${BLACKFIRE_CLIENT_TOKEN:-}
      - BLACKFIRE_SERVER_ID=${BLACKFIRE_SERVER_ID:-}
      - BLACKFIRE_SERVER_TOKEN=${BLACKFIRE_SERVER_TOKEN:-}

docker-compose.local.yml

version: "3"

services:
  db:
    extends:
      file: services.yml
      service: mysql

  cache:
    extends:
      file: services.yml
      service: redis

  web-1:
    extends:
      file: services.yml
      service: laravel
    ports:
      - 8001:80
    links:
      - cache
      - db
    environment:
      - APP_ENV=local
      - DATABASE_HOST=db
      - REDIS_HOST=cache
      - REDIS_PORT=6379
    volumes:
      - ./dev-1:/var/www/html:ro

  web-2:
    extends:
      file: services.yml
      service: php-apache
    ports:
      - 8002:80
    volumes:
      - ./dev-2:/var/www/html:ro

  admin:
    extends:
      file: services.yml
      service: phpmyadmin
    ports:
      - 8080:80
    links:
      - db

docker-compose.prod.yml

version: "3"

services:
  gateway:
    extends:
      file: services.yml
      service: traefik
    ports:
      - 80:80
      - 443:443

  cache:
    extends:
      file: services.yml
      service: redis

  backend:
    extends:
      file: services.yml
      service: laravel
    links:
      - cache
    environment:
      - REDIS_HOST=cache
      - REDIS_PORT=6379
    volumes:
      - ./webroot:/var/www/html:ro
    labels:
      - "traefik.http.services.laravel.loadbalancer.server.port=80"
      - "traefik.http.routers.laravel-route.rule=Host(`mydomain.com`,`www.mydomain.com`)"
      - "traefik.http.routers.laravel-route.service=laravel"

Experimental Docker structure.md

Beginning

There are many approaches to implementing a reuse of a common preset for Docker services for multiple environments, such as production and local environments.

This makes it possible to ensure the highest consistency for different environments with the same code-base. Implementing reuse of docker compose options also makes it easier to manage them.

I found on github a project called serversideup/spin. They took an approach using a feature called Docker overrides, to change some properties of common services for different environments.

After reading through their documentation, I realized that there are a few real-life cases where this project can not implement (or is difficult to archive).

That's why I decided to talk to the project owner and create this gists, for testing and discussion purposes.

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Use case

Let's assume that we need to build the following environments with the same code-base using the popular framework Laravel. The general requirement is that they should be as consistent as possible, and easy to operate.

General requirements

• Use a redis instance as a cache service
• Limit size of log files for all containers
• Automatically restart the container when it fails
• Simply launch docker for different environments
• Friendly with docker compose CLI

Production

• One web backend can scale to many instances
• Use traefik as gateway, support HTTP and HTTPS
• No need for other services like mysql, phpmyadmin attached

Local

• Two instances for web backend to test 2 different branches of code
• The first web backend runs on port 8001
• Second web backend running on port 8002
• Use additional mysql, phpmyadmin services for local development
• phpmyadmin running on port 8080
• No need to use traefik as gateway as each backend runs on its own port

Debug

• A web backend instance, running on port 80
• A blackfire service for profiling web backend
• Use additional mysql, phpmyadmin services for local development
• phpmyadmin running on port 8080
• No need to use traefik as gateway as each backend runs on its own port

This setup should follow the official Docker guidlines as much as possible.

Implementation

Concept

I was able to easily implement the above requirements in a simple way following the following concept structure.

./
┝━ services.yml
┝━ docker-compose.prod.yml
┝━ docker-compose.local.yml
┝━ docker-compose.debug.yml
┝━ webroot/
┝━ dev-1/
┝━ dev-2/
┝━ debug/
└─ dcom.sh

• services.yml contains definitions for all services
• docker-compose.prod.yml contains services for production
• docker-compose.local.yml contains services for local
• docker-compose.debug.yml contains services for debug
• webroot/ contains source code for production
• dev-1/ and dev-2/ contain contain source code for local
• debug/ contains source code for debug
• dcom.sh is a wrapper script for docker compose

Running services

As a result, you can easily run a single command to start all the necessary services for each predefined environment with docker compose.

For example, to run services for the production environment:

docker-compose -f docker-compose.prod.yml up -d

Very simple, right?

You don't need any other shell script, nor do you need to remember complicated command syntax to run it.

The dcom.sh

You might be wondering: "What is the shell script dcom.sh for?", am I right?

This is a wrapper to shorten your command line. dcom is short for "docker-compose".

We use it like this:

./dcom.sh env_name [arguments]

For example, to run services for the production environment:

./dcom.sh prod up -d

The parameter for dcom.sh is fully compatible with docker-compose interface.

Wait a second!

./dcom.sh prod up -d

Q: I am running this on production environment. As mentioned on the Use case, I want to run the service backend in 2 different instances on production, how can I do that?

A: It's very simple, you just need to run the command below, traefik will act as a load balancer for those instances intelligently.

./dcom.sh prod up -d --scale backend=2

Then check all running services with this:

./dcom.sh prod ps

Ref: Docker Compose CLI reference

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services.yml

version: "3"

################################################################################
################################################################################

services:

  ##############################################################################
  ##############################################################################
  common:
    platform: ${DOCKER_PLATFORM:-linux/amd64}
    restart:  ${DOCKER_RESTART:-unless-stopped}
    logging:
      driver: ${DOCKER_LOG_DRIVER:-json-file}
      options:
        max-size: ${DOCKER_LOG_SIZE:-32m}
        max-file: ${DOCKER_LOG_COUNT:-10}

  common-debug:
    extends: common
    cap_add:
      - SYS_PTRACE


  ##############################################################################
  ##############################################################################
  traefik:
    image: traefik:2.6
    extends: common
    volumes:
      - ./certs:/etc/certs
      - /var/run/docker.sock:/var/run/docker.sock:ro,cached
    command:
      - "--api.dashboard"
      - "--api.insecure"
      - "--log.level=INFO"
      - "--global.sendAnonymousUsage=false"

      ### HTTP
      - "--entrypoints.http.address=:80"
      - "--entryPoints.http.forwardedHeaders.insecure"

      ### HTTPS
      - "--entrypoints.https.address=:443"
      - "--entrypoints.https.http.tls=true"
      - "--entrypoints.https.http.tls.certResolver=my-acme"

      ### Providers
      - "--providers.docker"
      - "--providers.docker.exposedByDefault=false"
      - "--providers.docker.watch"

      ### Let's encrypt
      - "--certificatesresolvers.my-acme.acme.httpchallenge=true"
      - "--certificatesresolvers.my-acme.acme.httpchallenge.entrypoint=http"
      - "[email protected]"
      - "--certificatesresolvers.my-acme.acme.storage=/etc/certs/acme.json"


  ##############################################################################
  ##############################################################################
  mysql:
    image: mysql:5.7
    extends: common
    environment:
      MYSQL_ROOT_PASSWORD: p@ssw0rd


  ##############################################################################
  ##############################################################################
  memcached:
    image: memcached:1.6-alpine
    extends: common


  ##############################################################################
  ##############################################################################
  redis:
    image: redis:6-alpine
    extends: common
    environment:
      ALLOW_EMPTY_PASSWORD: "yes"


  ##############################################################################
  ##############################################################################
  php-apache:
    image: php:8.1-apache
    extends: common-debug
    healthcheck:
      test: "curl -f 'http://localhost' || exit 1"
      start_period: 30s
      interval: 1m
      timeout: 5s
    labels:
      - "traefik.enable=true"


  ##############################################################################
  ##############################################################################
  laravel:
    extends: php-apache
    environment:
      - APP_ENV=production


  ##############################################################################
  ##############################################################################
  blackfire:
    image: blackfire/blackfire:2
    extends: common-debug
    environment:
      - BLACKFIRE_DISABLE_LEGACY_PORT=8307
      - BLACKFIRE_LOG_LEVEL=4
      - BLACKFIRE_MEMORY_LIMIT=256


  ##############################################################################
  ##############################################################################
  phpmyadmin:
    image: phpmyadmin:apache
    extends: common-debug
    environment:
      - PMA_ARBITRARY=1
      - PMA_HOST=db
      - PMA_USER=root
      - PMA_PASSWORD=p@ssw0rd

@jaydrogers

I still have the feeling that the percentage of options being reused in your examples becomes less and decays between different environments.

Can you explain more? We've been running the "spin" set up for over a year in production and I have yet to run into any limitations.

Specifically, after going through your example, I am confused as to why create 2 docker-compose files when I can simply use just docker-compose.dev.yml. I'm not saying your concept is incorrect, please don't misunderstand me.

From a DevOps point of view, I don't really see the point of creating a docker-compose.yml file in your example. For me, in most practical cases, I just bring the contents of the docker-compose.yml file into the docker-compose.dev.yml file, it should work! Then I may not need spin because the docker-compose command has also become simpler.

In other cases, your wordpress example, I find the docker-compose files for various environments are mostly written quite differently, which means the reusability of those environments is low, and they will lack of consistency. At that time, I thought that overriding the base docker-compose.yml file was not necessary anymore.

Last but not least.

I believe you will be able to gradually improve this project, and in the future it will not only be used for development, but can be more flexible for medium and large projects to use.

Regards.