Docker Compose is an open-supply field device for running a multi-field Docker utility. Docker Compose makes use of a YAML syntax structure, this is normally used for configuration documents and to outline and run field–primarily based totally applications. Compose additionally guide to outline and configure utility‘s offerings in YAML format. The principal benefit of Docker Compose is that you could outline a multi-field utility in one single file, in an effort to spin up the utility with only a single command which does want to be finished to get it jogging. With Compose you could control the entire lifecycle of utility: Managing offerings with start, stop, or rebuild View the popularity of running services Output the log of running services Run a one-off command on a service In this tutorial, we discover ways to set up Docker-compose on Ubuntu 20.04, and a way to run the sample-container app.
Install Docker Compose on Ubuntu
For successful installation of Docker Compose, need to have Docker installed on Ubuntu 20.04.
Read Now: How to setup Docker in Ubuntu 20.04
After installing Docker, you can verify that docker is installed and version with following command:
$ docker version
Client: Docker Engine - Community Version: 20.10.6 API version: 1.41 Go version: go1.13.15 Git commit: 370c289 Built: Fri Apr 9 22:47:17 2021 OS/Arch: linux/amd64 Context: default Experimental: true Server: Docker Engine - Community Engine: Version: 20.10.6 API version: 1.41 (minimum version 1.12) Go version: go1.13.15 Git commit: 8728dd2 Built: Fri Apr 9 22:45:28 2021 OS/Arch: linux/amd64 Experimental: false containerd: Version: 1.4.4 GitCommit: 05f951a3781f4f2c1911b05e61c160e9c30eaa8e runc: Version: 1.0.0-rc93 GitCommit: 12644e614e25b05da6fd08a38ffa0cfe1903fdec docker-init: Version: 0.19.0 GitCommit: de40ad0
Since we now have a Docker, we are ready to install Docker compose.
To install docker compose from the Official Ubuntu repository, run:
$ sudo apt install docker-compose
This option will not guarantee that you downloading the latest docker-compose version.
Instead of downloading Docker Compose from the Ubuntu repository, we are suggesting downloading the binary package using an URL with the curl command:
$ sudo curl -L "https://github.com/docker/compose/releases/download/1.29.2/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
This command saves the file in: /usr/local/bin directory, under the name docker-compose.
% Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 633 100 633 0 0 5456 0 --:--:-- --:--:-- --:--:-- 5456 100 12.1M 100 12.1M 0 0 40.0M 0 --:--:-- --:--:-- --:--:-- 40.0M
Next, we need to change the file permission, making the downloaded file executable with the following command:
$ sudo chmod +x /usr/local/bin/docker-compose
Verify installation, and check Docker Compose version:
$ docker–compose –version
docker-compose version 1.29.2, build 5becea4c
Test Docker Compose with Sample Container
Create new directory for your sample container example:
$ mkdir docker-compose-test
Change directory that you just created:
$ cd docker-compose-test
From there, create a YAML configuration file:
$ sudo nano docker-compose.yaml
And copy the following configuration into docker-compose.yaml file that you just opened:
command: [/bin/echo, 'Hello world']
Save this, and run:
$ docker-compose up
You need to see steps for:
- pulling hello_world(ubuntu)
- Downloaded picture for ubuntu:latest
- Creating docker-compose-test_hello_world_1
- Attaching to docker-compose-test_hello_world_1
- Docker-compose the use of folder call because the venture call to prefix boxes and networks.
This created the box from the ubuntu picture, and run instructions that have been particular at the docker-compose.yaml.
In this tutorial, we discovered the way to deployation Docker-compose on Ubuntu 20.04, and the way to run the sample-box app. Docker-compose permits you to run more than one docker boxes on only a unmarried host, in case you want to run more than one boxes on more than one nodes, please check with answers which include Kubernetes or Swarm.
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