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