Docker use cases

Docker container as a service

Restart policy option for run command

read more: https://docs.docker.com/engine/reference/run/#restart-policies-restart

Common commands

Simple container

docker run -it centos

Simple deamon container in detached mode

docker run --name docker_daemon -d \
  --restart=unless-stopped \
  -v $(pwd)/service:/scripts \
  centos \
  /scripts/service.sh

Cons: it doesn't work after restart.

####Show containers status

docker ps

####Show container logs

docker logs -f docker_daemon

####Stop and remove docker container

docker stop docker_daemon && docker rm docker_daemon
docker rm -f docker_daemon

Dockerized mysql deamon

Run mysql container with restart

docker run --name docker-mysql -d \
  --restart=unless-stopped \
  -v $(pwd)/mysql:/var/lib/mysql \
  -p 3306:3306 \
  -e MYSQL_ROOT_PASSWORD=root \
  -e MYSQL_DATABASE=drupal \
  mysql

read more: https://hub.docker.com/_/mysql/

Call mysql command inside container

docker exec -it docker-mysql mysql -uroot -proot

Alias for mysql container

alias dmysql="docker exec -it docker-mysql mysql -uroot -proot"

Docker container as a tool

Use required tool or process inside container and receive result via mounted volumes.

Common way:

docker run --rm -v $(pwd):/mounted_dir tool-contaner [args]

Dockerized Php Code Sniffer

Call phpcs from container

cd /path/to/the/code
docker run --rm -v $(pwd):/work phpcs-drupal

To call phpcbf you need rewrite entrypoint directive

docker run --rm -v $(pwd):/work phpcs-drupal phpcbf --standard=Drupal ./

Dockerfile magic

Dockerfile content

# Parent container
FROM php:7.0-alpine

# Setup required packages
RUN curl -sS https://getcomposer.org/installer | php -- --filename=composer --install-dir=/usr/bin
RUN composer global require drupal/coder \
    && ln -s /root/.composer/vendor/squizlabs/php_codesniffer/scripts/phpcs /usr/bin/phpcs \
    && ln -s /root/.composer/vendor/squizlabs/php_codesniffer/scripts/phpcbf /usr/bin/phpcbf \
    && ln -s /root/.composer/vendor/drupal/coder/coder_sniffer/Drupal /root/.composer/vendor/squizlabs/php_codesniffer/CodeSniffer/Standards/Drupal
RUN apk add --no-cache patch

# Set environment directives
VOLUME /work
WORKDIR /work
CMD ["phpcs", "--standard=Drupal", "."]

Building image process

cd path/to/Dockerfile
docker build -t phpcs-drupal .

Local dev environment based on docker

Simple drupal env with mysql php

To make simple env we need to create two containers for php and db

Preparation

drush dl drupal --drupal-project-rename=drupal

Mysql container start

docker run --name mysql -d \
  --restart=unless-stopped \
  -v $(pwd)/mysql:/var/lib/mysql \
  -p 3306:3306 \
  -e MYSQL_ROOT_PASSWORD=root -e MYSQL_DATABASE=drupal \
  mysql

Php container start

docker run --name php -d \
  -v $(pwd)/drupal:/srv \
  -p 8000:80 \
  --link mysql:mysql \
  skilldlabs/php:7 \
  php -t /srv -S 0.0.0.0:80

skilldlabs/php:7 Dockerfile

Install drupal

# enter to container 
docker exec -it php sh

# install drupal
composer update
drush si --db-url=mysql://root:root@mysql/drupal -y
...
# exit, stop and remove containers
exit
docker stop php mysql && docker rm php mysql

Docker compose

To run environment from docker-compose.yml file just call docker-compose up

cd path/to/docker-compose/file
drush dl drupal --drupal-project-rename=drupal
docker-compose up -d
docker-compose exec php sh

docker-compose.yml file magic

version: "2"

services:
  php:
    image: skilldlabs/php:7
    ports:
      - "8001:80"
    volumes:
      - ./drupal:/srv
    links:
      - mysql:mysql
    depends_on:
      - mysql
    restart: always

  mysql:
    image: mysql
    volumes:
      - ./db:/var/lib/mysql
    environment:
      MYSQL_DATABASE: drupal
      MYSQL_ROOT_PASSWORD: root
    restart: always

Stop and remove containers

docker-compose stop && echo "y" | docker-compose rm

Building drupal with gitlab based on docker

https://gitlab.com/andriyun/dockerized-drupal

Useful links

• docs.docker.com
• Get started tutorial
• Official docker registry
• 15 Docker Tips in 5 Minutes
• Docker Cheat Sheet

Tips

# Start simple php dev server
php -S localhost:8000

# Usefull aliases
alias allismine="sudo chown -R $(whoami):$(whoami) *"
alias docker-washup="docker stop $(docker ps -a -q) && docker rm $(docker ps -a -q)"

free -h