Install Docker on CentOS 7

STEP 1 - Update the package

root# yum check-update

STEP 2 - Install Dependencies

root# yum install -y yum-utils device-mapper-persistent-data lvm2

The –y switch indicates to the yum installer to answer “yes” to any prompts that may come up. The yum-utils switch adds the yum-config-manager. Docker uses a device mapper storage driver, and the device-mapper-persistent-data and lvm2 packages are required for it to run correctly.

STEP 3 - Add the Docker Repository to CentOS

root# yum-config-manager --add-repo 

https://download.docker.com/linux/centos/docker-ce.repo

STEP 4 - Install Docker On CentOS Using Yum

root# yum install docker

Your operating system may ask you to accept the GPG key. This is like a digital fingerprint, so you know whether to trust the installation.

The fingerprint should match the following format:

060A 61C5 1B55 8A7F 742B 77AA C52F EB6B 621E 9F35

STEP 5 - Manage Docker Service

Start Docker Service

root# systemctl start docker

Enable Docker on Startup

root# systemctl enable docker

Check Docker Service

root# systemctl status docker