How to install and setup Docker on RHEL 7/CentOS 7

To install and set up Docker on RHEL 7 or CentOS 7, you can use the following steps:

1. Install the required packages:

sudo yum install -y yum-utils device-mapper-persistent-data lvm2

This will install the yum-utils and device-mapper-persistent-data packages, which are required to set up the Docker repository.

2. Add the Docker repository:

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

This will add the Docker Community Edition (CE) repository to your system.

3. Install Docker:

sudo yum install docker-ce

This will install the latest version of Docker CE available from the repository.

4. Enable and start the Docker service:

sudo systemctl enable --now docker

5. Add your user to the docker group:

sudo usermod -aG docker $USER

This will allow you to run Docker commands without using sudo.

6. Test the installation:

docker run hello-world

This will run a simple Docker container, which will print a message indicating that Docker is working correctly.