How to Install Docker on CentOS 7

Docker is essential, and this article explains how to install it on a CentOS 7 environment.

1. Uninstall any existing Docker packages:

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

2. Install yum-utils to manage repositories:

sudo yum install -y yum-utils

3. Add the Docker yum repository (recommended Alibaba Cloud mirror for faster download):

sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

4. Install Docker Engine, CLI, and containerd:

sudo yum install -y docker-ce docker-ce-cli containerd.io

5. Start Docker service and enable it to start on boot:

sudo systemctl start docker
sudo systemctl enable docker

6. Verify the installation by checking the Docker version and detailed information:

docker -v
docker info

Additional note: The article also includes a daily motivational quote and a recommendation link, but the core content focuses on the Docker installation steps.