Installing Docker-Compose on Ubuntu

    On our previous article we saw how to install docker on Ubuntu 17.04. That is suitable for running a individual container(single applications). What if we want to run multi container application?

    This leads to the invention of docker-compose, In this article, we will see you how to install the latest version of Docker Compose to help you to manage multi-container applications.

Installing Docker Compose:

    Run the below curl command which will download and install the latest version of docker-compose,

jhony@ljunix~$ sudo curl -L https://github.com/docker/compose/releases/download/1.18.0/docker-compose-`uname -s`-`uname -m` -o /usr/local/bin/docker-compose

Change the permission of the downloaded file which will make it as an executable one,

jhony@ljunix~$ sudo chmod +x /usr/local/bin/docker-compose

Check your installation:

    Run the below command to check the version of docker-compose,

jhony@ljunix~$ docker-compose --version docker-compose version 1.18.0, build 8dd22a9

Verify your installation:

    We can check whether the installation is successful or not by running the docker-compose command,

Running a Container with Docker Compose:

    Docker compose will always check for for a YAML file called as docker-compose.yml. To check our installation we will create a directory called hello-world where we going to run the hello-world image.

jhony@ljunix~$ mkdir hello-world
jhony@ljunix~$ cd hello-world

    Create the YAML file for the hello-world image with you favourite text editor,

jhony@ljunix:hello-world/$ vim docker-compose.yml

Paste the below content into docker-compose.yml file,

my-test: image: hello-world

The first line in the YAML file is used as part of the container name. The second line specifies which image to use to create the container. Likewise we can add more containers with above syntax.

Now run the docker-compose command to run the application,

jhony@ljunix:hello-world/$ docker-compose up Pulling my-test (hello-world:latest)... latest: Pulling from library/hello-world 1b930d010525: Pull complete Digest: sha256:2557e3c07ed1e38f26e389462d03ed943586f744621577a99efb77324b0fe535 Status: Downloaded newer image for hello-world:latest Creating tmp_my-test_1 ... done Attaching to tmp_my-test_1 my-test_1 | my-test_1 | Hello from Docker! my-test_1 | This message shows that your installation appears to be working correctly. my-test_1 | my-test_1 | To generate this message, Docker took the following steps: my-test_1 | 1. The Docker client contacted the Docker daemon. my-test_1 | 2. The Docker daemon pulled the "hello-world" image from the Docker Hub. my-test_1 | (amd64) my-test_1 | 3. The Docker daemon created a new container from that image which runs the my-test_1 | executable that produces the output you are currently reading. my-test_1 | 4. The Docker daemon streamed that output to the Docker client, which sent it my-test_1 | to your terminal. my-test_1 | my-test_1 | To try something more ambitious, you can run an Ubuntu container with: my-test_1 | $ docker run -it ubuntu bash my-test_1 | my-test_1 | Share images, automate workflows, and more with a free Docker ID: my-test_1 | https://hub.docker.com/ my-test_1 | my-test_1 | For more examples and ideas, visit: my-test_1 | https://docs.docker.com/get-started/ my-test_1 | tmp_my-test_1 exited with code 0

    If your installation is successful you will get the above output.

 We've now successfully installed Docker Compose in our system.

Feel free to ask if you have any questions.