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