If you are new to Docker or you are wondering why docker is very popular today, I recommend you to read my previous posts Introduction to Docker.
For this tutorial, you need a linux machine. I am using Linode server because it is very performant and affordable.
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Pull Containers from Docker registry
Searching for containers
Docker have a public registry where you could find images of dockerized application that are ready to use. All information and indications for using container are specified too.
In this post, I will show you how to connect PhpMyAdmin container to MySQL server container. First of all, we must pull the images from repository. In order to find the image that you want, you can :
- Go to Docker Hub and search for the corresponding image
- Using docker command-line to search : docker search image
I recommend you to look at Docker Hub website for the first time. Then, try to understand how the image work by reading author instructions. Now we will pull 2 containers that i chose from Docker hub.
# Pull containers $ docker pull mysql/mysql $ docker pull phpmyadmin/phpmyadmin # Verify that images are pulled correctly $ docker images
Running MySQL Server container
After downloading the image, we must configure and run the container. You’ll notice that a lot of containers is configured by pre-defining ENVIRONNEMENT VARIABLES before running the application. For the first time, i agree that it’s not easy to manipulate containers and to understand how it runs. But later, i think that docker will be your best friend ^^.
Docker command line have many options
$ docker run --name name-of-container -e YOUR_ENV_VARIABLE=var1 -p host-port:container-port name-of-image (command)
- -e : to indicate the declaration of Environnemnt variable inside the container
- -d : run the container in background
- -p : bind container port to host port
- –name : to name the container generated
- –link : link 2 containers together.
- command : optionnally we can add a command to be executed.
Now, let’s run mysql container now :
$ docker run --name mysql -e MYSQL_ROOT_PASSWORD=0000 -d mysql
Running PhpMyAdmin container
Phpmyadmin must point to MySQL Server. So that we must link both containers by adding the option : –link name-of-container:name-of-imag.
$ docker run --name myadmin -d --link mysql:db -p 8080:80 phpmyadmin/phpmyadmin
Now go to your browser , tap http://localhost:8080 and login with root/0000 . Voilà your containers work fine.
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