How to install and validate Docker CE and Docker Compose on CentOS

Here in this article we will try to install and setup Docker CE (Community Edition) and Docker Compose on centos 7 machine. Here we are going to install Docker CE and Docker Compose using RPM package.

Test Environment

CentOS 7 64-bit version

What is Docker

Docker is a platform designed to help developers build, share, and run container applications. We handle the tedious setup, so you can focus on the code.

What is Docker Compose

Docker Compose is a tool for defining and running multi-container docker applications. It uses a compose file to define services for your application. Using a single command you can create and start all services defined in the compose file.

Procedure

Step1: Docker Setup

Let’s now see how we can install docker service on centos linux system.

Step1.1 Download RPM packages

Here in this step we are going to download the following packages for the centos repository as shown below.

URL - https://download.docker.com/linux/centos/7/x86_64/stable/Packages/

Packages:

docker-ce-17.03.1.ce-1.el7.centos.x86_64.rpm
docker-ce-selinux-17.03.1.ce-1.el7.centos.noarch.rpm

Step1.2: Install the docker-ce-selinux RPM package

Let’s now install the docker-ce-selinux package as shown below.

sudo yum install docker-ce-selinux-17.03.1.ce-1.el7.centos.noarch.rpm

Step1.3: Install the docker-ce RPM package

Now let’s install docker-ce package as shown below.

sudo yum install docker-ce-17.03.1.ce-1.el7.centos.x86_64.rpm

Step1.4: Verify the docker installation

Once the required packages are installed we can verify the installed docker version as shown below.

docker --version

Output:

Docker version 17.03.1-ce, build c6d412e

Step1.5: Start the Docker service

It’s time to start the docker and enable service startup on reboot as shown below.

sudo systemctl start docker
sudo systemctl enable docker

Step1.6: Run the hello-world docker image

Let’s now verify our installation by running a sample “hello-world” docker image as shown below.

sudo docker run hello-world

Output:

Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
78445dd45222: Pull complete
Digest: sha256:c5515758d4c5e1e838e9cd307f6c6a0d620b5e07e6f927b07d05f6d12a1ac8d7
Status: Downloaded newer image for hello-world:latest


Hello from Docker!
This message shows that your installation appears to be working correctly.


To generate this message, Docker took the following steps:
 1. 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.


To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash


Share images, automate workflows, and more with a free Docker ID:
 https://cloud.docker.com/


For more examples and ideas, visit:
 https://docs.docker.com/engine/userguide/

Step1.7: Location of images, containers, volumes or customised configuration files

Here is the default location of images, containers and volumes that are stored for the docker containers.

sudo ls -ltr /var/lib/docker/

Output:

total 8
drwx------. 4 root root   30 Jun 14 03:07 plugins
drwx------. 3 rootroot   20 Jun 14 03:07 image
drwx------. 2 root root   24 Jun 14 03:07 volumes
drwx------. 2 root root    6 Jun 14 03:07 trust
drwxr-x---. 3 rootroot   18 Jun 14 03:07 network
drwx------. 2 root root    6 Jun 14 03:07 swarm
drwx------. 2 root root    6 Jun 14 03:07 tmp
drwx------. 7 root root 4096 Jun 14 03:08 overlay
drwx------. 4 root root 4096 Jun 14 03:08 containers

Step2: Docker Compose Setup

Next, let us now setup Docker Compose as show below.

Step2.1: Download the Docker Compose binary

Here we will download the docker compose binary from the following location and save it to “/usr/local/bin” directory as shown below.

sudo curl -L https://github.com/docker/compose/releases/download/1.14.0-rc2/docker-compose-Linux-x86_64 > /usr/local/bin/docker-compose

Step2.2: Run docker-compose executable

Running the docker-compose tool without any options should provide you with an help output.

chmod 755 /usr/local/bin/docker-compose

/usr/local/bin/docker-compose

Step2.3: Test the installation

You can verify the version of the docker-compose that is installed as shown below.

docker-compose --version

Output:

docker-compose version 1.14.0-rc2, build 24dae73

Hope you enjoyed reading this article. Thank you..