Installing Docker on CentOS 7

On the system (most likely a virtual machine) dedicated to Command Center, make sure you have the latest version of Docker up and running. The following steps may help.

A user with sudo privileges is required to run most commands.

Uninstall old Docker versions

This is an optional step in case your Docker version is out of date:

   sudo yum remove docker \
                 docker-client \
                 docker-client-latest \
                 docker-common \
                 docker-latest \
                 docker-latest-logrotate \
                 docker-logrotate \
                 docker-engine

Install Docker using the repository

   sudo yum install -y yum-utils
   sudo yum-config-manager \
     --add-repo \
     https://download.docker.com/linux/centos/docker-ce.repo

   sudo yum install docker-ce docker-ce-cli containerd.io docker-compose-plugin

Start Docker

Start docker using the following command:

   $ sudo systemctl start docker

Enable the Docker service to start automatically on system boot by running the following command:

   $ sudo systemctl enable docker

Verify that Docker Engine is installed correctly

Run the hello-world image.

   $ sudo docker run hello-world

This command will run a test container and display a message indicating that the installation is working properly.