Container: Docker Compose on Ubuntu 16.04 ============================================================ [![docker compose logo](https://www.unixmen.com/wp-content/uploads/2017/06/docker-compose-logo-696x1226.png "docker-compose-logo")][3] ### What is Docker Compose [Docker Compose][4] is a tool for running multi-container Docker applications. To configure an application’s services with Compose we use a configuration file, and then, executing a single command, it is possible to create and start all the services specified in the configuration. Docker Compose is useful for many different projects like: * **Development**: with the Compose command line tools we create (and interact with) an isolated environment which will host the application being developed. By using the [Compose file][2], developers document and configure all of the application’s service dependencies. * **Automated testing**: this use case requires an environment for running tests in. Compose provides a convenient way to manage isolated testing environments for a test suite. The full environment is defined in the Compose file. Docker Compose was made on the [Fig][5] source code, a community project now unused. In this tutorial we will see how to install Docker Compose on an Ubuntu 16.04 machine. ### Install Docker We need Docker in order to install Docker Compose. First, add the public key for the official Docker repository: ``` $ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add- ``` Next, add the Docker repository to `apt` sources list: ``` $ sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" ``` Update the packages database and install Docker with `apt`: ``` $ sudo apt-get update $ sudo apt install docker-ce ``` At the end of the installation process, the Docker daemon should be started and enabled to load at boot time. We can check its status with the following command: ``` $ sudo systemctl status docker --------------------------------- ● docker.service - Docker Application Container Engine Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled) Active: active (running) ``` ### Install Docker Compose At this point it is possible to install Docker Compose. Download the current release by executing the following command: ``` # curl -L https://github.com/docker/compose/releases/download/1.14.0/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose ``` Make the downloaded binary executable: ``` # chmod +x /usr/local/bin/docker-compose ``` Check the Docker Compose version: ``` $ docker-compose -v ``` The output should be something like this: ``` docker-compose version 1.14.0, build c7bdf9e ``` ### Testing Docker Compose The Docker Hub includes a Hello World image for demonstration purposes, illustrating the configuration required to run a container with Docker Compose. Create a new directory and move into it: ``` $ mkdir hello-world $ cd hello-world ``` Create a new YAML file: ``` $ $EDITOR docker-compose.yml ``` In this file paste the following content: ``` unixmen-compose-test: image: hello-world ``` _**Note:** the first line is used as part of the container name._ Save and exit. #### Run the container Next, execute the following command in the `hello-world` directory: ``` $ sudo docker-compose up ``` If everything is correct, this should be the output shown by Compose: ``` Pulling unixmen-compose-test (hello-world:latest)... latest: Pulling from library/hello-world b04784fba78d: Pull complete Digest: sha256:f3b3b28a45160805bb16542c9531888519430e9e6d6ffc09d72261b0d26ff74f Status: Downloaded newer image for hello-world:latest Creating helloworld_unixmen-compose-test_1 ... Creating helloworld_unixmen-compose-test_1 ... done Attaching to helloworld_unixmen-compose-test_1 unixmen-compose-test_1 | unixmen-compose-test_1 | Hello from Docker! unixmen-compose-test_1 | This message shows that your installation appears to be working correctly. unixmen-compose-test_1 | unixmen-compose-test_1 | To generate this message, Docker took the following steps: unixmen-compose-test_1 | 1\. The Docker client contacted the Docker daemon. unixmen-compose-test_1 | 2\. The Docker daemon pulled the "hello-world" image from the Docker Hub. unixmen-compose-test_1 | 3\. The Docker daemon created a new container from that image which runs the unixmen-compose-test_1 | executable that produces the output you are currently reading. unixmen-compose-test_1 | 4\. The Docker daemon streamed that output to the Docker client, which sent it unixmen-compose-test_1 | to your terminal. unixmen-compose-test_1 | unixmen-compose-test_1 | To try something more ambitious, you can run an Ubuntu container with: unixmen-compose-test_1 | $ docker run -it ubuntu bash unixmen-compose-test_1 | unixmen-compose-test_1 | Share images, automate workflows, and more with a free Docker ID: unixmen-compose-test_1 | https://cloud.docker.com/ unixmen-compose-test_1 | unixmen-compose-test_1 | For more examples and ideas, visit: unixmen-compose-test_1 | https://docs.docker.com/engine/userguide/ unixmen-compose-test_1 | helloworld_unixmen-compose-test_1 exited with code 0 ``` Docker containers only run as long as the command is active, so the container will stop when the test finishes running. ### Conclusion This concludes the tutorial about the installation of Docker Compose on an Ubuntu 16.04 machine. We have also seen how to create a simple project through the Compose file in YAML format. -------------------------------------------------------------------------------- via: https://www.unixmen.com/container-docker-compose-ubuntu-16-04/ 作者：[ Giuseppe Molica][a] 译者：[译者ID](https://github.com/译者ID) 校对：[校对者ID](https://github.com/校对者ID) 本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出 [a]:https://www.unixmen.com/author/tutan/ [1]:https://www.unixmen.com/author/tutan/ [2]:https://docs.docker.com/compose/compose-file/ [3]:https://www.unixmen.com/wp-content/uploads/2017/06/docker-compose-logo.png [4]:https://docs.docker.com/compose/overview/ [5]:http://www.fig.sh/