How to Install Docker Compose on Ubuntu 18.04?
Introduction
Docker is a great tool for automating the deployment of Linux applications inside software containers, but to take full advantage of its potential each component of an application should run in its own individual container. For complex applications with a lot of components, orchestrating all the containers to start up, communicate, and shut down together can quickly become unwieldy.
The Docker community came up with a popular solution called Fig, which allowed you to use a single YAML file to orchestrate all your Docker containers and configurations. This became so popular that the Docker team decided to make Docker Compose based on the Fig source, which is now deprecated. Docker Compose makes it easier for users to orchestrate the processes of Docker containers, including starting up, shutting down, and setting up intra-container linking and volumes.
In this tutorial, we’ll show you how to install the latest version of Docker Compose to help you manage multi-container applications.
Step 1 — Installing Docker Compose
Although we can install Docker Compose from the official Ubuntu repositories, it is several minor version behind the latest release, so we’ll install Docker Compose from the Docker’s GitHub repository. The command below is slightly different than the one you’ll find on the Releases page. By using the -o flag to specify the output file first rather than redirecting the output, this syntax avoids running into a permission denied error caused when using sudo.
We’ll check the current release and if necessary, update it in the command below:
sudo curl -L https://github.com/docker/compose/releases/download/1.21.2/docker-compose-`uname -s`-`uname -m` -o /usr/local/bin/docker-compose
Next we’ll set the permissions:
sudo chmod +x /usr/local/bin/docker-compose
Then we’ll verify that the installation was successful by checking the version:
docker-compose --version
This will print out the version we installed:
Outputdocker-compose version 1.21.2, build a133471
Now that we have Docker Compose installed, we’re ready to run a “Hello World” example.
Step 2 — Running a Container with Docker Compose
The public Docker registry, Docker Hub, includes a Hello World image for demonstration and testing. It illustrates the minimal configuration required to run a container using Docker Compose: a YAML file that calls a single image:
First, we’ll create a directory for the YAML file and move into it:
mkdir hello-world
cd hello-world
Then, we’ll create the YAML file:
nano docker-compose.yml
Put the following contents into the file, save the file, and exit the text editor:
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. When we run the command docker-compose up it will look for a local image by the name we specified, hello-world. With this in place, we’ll save and exit the file.
We can look manually at images on our system with the docker images command:
docker images
When there are no local images at all, only the column headings display:
OutputREPOSITORY TAG IMAGE ID CREATED SIZE
Now, while still in the ~/hello-world directory, we’ll execute the following command:
docker-compose up
The first time we run the command, if there’s no local image named hello-world, Docker Compose will pull it from the Docker Hub public repository:
OutputPulling my-test (hello-world:latest)...
latest: Pulling from library/hello-world
c04b14da8d14: Downloading [==================================================>] c04b14da8d14: Extracting [==================================================>] c04b14da8d14: Extracting [==================================================>] c04b14da8d14: Pull complete
Digest: sha256:0256e8a36e2070f7bf2d0b0763dbabdd67798512411de4cdcf9431a1feb60fd9
Status: Downloaded newer image for hello-world:latest
. . .
After pulling the image, docker-compose creates a container, attaches, and runs the hello program, which in turn confirms that the installation appears to be working:
Output. . .
Creating helloworld_my-test_1...
Attaching to helloworld_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 |
. . .
Then it prints an explanation of what it did:
Output of docker-compose up1\. The Docker client contacted the Docker daemon.
2\. The Docker daemon pulled the "hello-world" image from the Docker Hub.
3\. The Docker daemon created a new container from that image which runs the executable that produces the output you are currently reading.
4\. The Docker daemon streamed that output to the Docker client, which sent it to your terminal.
Docker containers only run as long as the command is active, so once hello finished running, the container stopped. Consequently, when we look at active processes, the column headers will appear, but the hello-world container won’t be listed because it’s not running.
docker ps
OutputCONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
We can see the container information, which we’ll need in the next step, by using the -a flag which shows all containers, not just the active ones:
docker ps -a
OutputCONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
06069fd5ca23 hello-world "/hello" 35 minutes ago Exited (0) 35 minutes ago drunk_payne
This displays the information we’ll need to remove the container when we’re done with it.
Step 3 — Removing the Image (Optional)
To avoid using unnecessary disk space, we’ll remove the local image. To do so, we’ll need to delete all the containers that reference the image using the docker rm command, followed by either the CONTAINER ID or the NAME. Below, we’re using the CONTAINER ID from the docker ps -a command we just ran. Be sure to substitute the ID of your container:
docker rm 06069fd5ca23
Once all containers that reference the image have been removed, we can remove the image:
docker rmi hello-world
Conclusion
We’ve now installed Docker Compose, tested our installation by running a Hello World example, and removed the test image and container.
Originally published by Melissa Anderson at https://www.digitalocean.com
#Docker #Ubuntu #DevOps
