Setup docker environment on Mac

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Setup docker environment on Mac

Install docker-toolbox

Docker introduces docker-toolbox for installing docker, docker-compose, docker-machine. In my understanding, docker-machine can be considered as a replacement and a upgraded version of boot2docker. It will allow you to create separated virtualboxes for different projects. Docker-compose is a script which consist of several docker containers. Each docker container can be built with an independent Dockerfile.

Docker file structure

As the followings, we need to create a file called docker-compose.yml first. It's a config file for all docker containers. Each container can be created by a Dockerfile which is stored in .docker folder. We usually put the code base in docroot directory.

./
.docker/
docroot/
docker-compose.yml

Docker-machine create

Create a machine. Requires the --driver flag to indicate which provider (VirtualBox, DigitalOcean, AWS, etc.) the machine should be created on, and an argument to indicate the name of the created machine. The following command can be used as a sample. 

docker-machine create --driver virtualbox os

You can also check the docker-machine list by the command: 

docker-machine ls

The result of the command above will be like the following. We can see the ip address of each docker-machine. The ACTIVE column shows only one docker-machine drupalchilli is active by the sign *.

NAME           ACTIVE   DRIVER       STATE     URL                         SWARM   DOCKER        ERRORS
default        -        virtualbox   Running   tcp://192.168.99.100:2376           v17.03.0-ce
drupalchilli   *        virtualbox   Running   tcp://192.168.99.101:2376           v17.03.0-ce
os             -        virtualbox   Running   tcp://192.168.99.102:2376           v17.04.0-ce

To switch a docker-machine to be active, you can run the command below. All docker-machines are independent projects. If you are working on multiple projects, it is important to make sure you are using the right docker-machine env.

eval $(docker-machine env os)

Get started with docker-compose

Create a file called docker-compose.yml in your project directory and paste the following:

version: '2'
services:
  web:
    build: .docker/web
    ports:
     - "80:80"
    volumes:
     - .:/docroot
  redis:
    image: "redis:alpine"

This Compose file defines two services, web and redis. The web service:

  • Uses an custom image that’s built from the Dockerfile in the .docker/web directory.
  • Forwards the exposed port 80 on the container to port 80 on the host machine.
  • "volumes" mounts the project directory on the host to /docroot inside the container, allowing you to modify the code without having to rebuild the image.

The redis service uses a public Redis image pulled from the Docker Hub registry.

Create a Dockerfile

You write a Dockerfile that builds a Docker image. The image contains all the dependencies the php application requires, including php itself. 

This tells Docker to:

  • Build an image starting with the php:7.0-apache image.
  • Add the current directory . into the path /code in the image.
  • Set the working directory to /code.
  • Install the Python dependencies.
  • Run bash command a2enmod rewrite
FROM php:7.0-apache
ADD . /code
WORKDIR /code
RUN a2enmod rewrite

Docker-compose setup custom database user account

The "environment" command setups custom database configuration. "MYSQL_DATABASE" setup database name; "MYSQL_USER" and "MYSQL_PASSWORD" create a new mysql user and its password. "MYSQL_ROOT_PASSWORD" setup the root user's password.

db:
  build: .docker/db
  ports:
    - 3306:3306
  environment:
    MYSQL_ROOT_PASSWORD: rootpass
    MYSQL_USER: dbuser
    MYSQL_PASSWORD: userpass
    MYSQL_DATABASE: myimage_db

How to import existed MYSQL database

The official postgres docker image will run .sql scripts found in the /docker-entrypoint-initdb.d/ folder. So all you need is to create db Dockerfile like below:

FROM mysql:5.6

ADD drupalchilli.sql /docker-entrypoint-initdb.d

If you are working on Drupal project, Drupal settings.php file needs to be configed according to the custom database environment you just setup. Also the database host should be the docker-machine ip address.

 

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