Deploy Docker on Cloud Linux 3 and Build a Custom Nginx Image

Deploy Docker CE on Cloud Linux 3

Download the official Docker‑CE yum repository file (the example uses the Aliyun mirror). The file is saved as /etc/yum.repos.d/docker-ce.repo so that yum can locate the packages.

sudo wget -O /etc/yum.repos.d/docker-ce.repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

Install Docker CE and its dependencies. sudo yum -y install docker-ce Verify the installation by printing the client version. A typical output is Docker version 20.xx.xx, build xxxxxxx . docker -v Start the Docker daemon. sudo systemctl start docker Enable automatic start on boot so Docker survives a reboot. sudo systemctl enable docker Check the service status; the line Active: active (running) confirms a healthy daemon.

systemctl status docker

Build a Custom Nginx Image

Pull the desired base image from Docker Hub. The example uses version 1.23.4 of the official Nginx image. sudo docker pull nginx:1.23.4 Create a Dockerfile in an empty directory. The file defines the build instructions. vim Dockerfile Insert the following content:

# Use the pulled Nginx image as the base
FROM nginx:1.23.4
# Replace the default homepage with a custom message
RUN echo '<h1>Welcome, Docker! 开源技术小栈 </h1>' > /usr/share/nginx/html/index.html

Build a new image from the Dockerfile . The tag tinywan-image001:v1 consists of a repository name ( tinywan-image001 ) and a version tag ( v1 ). sudo docker build -t tinywan-image001:v1 . List local images to confirm that the new image appears. sudo docker images Run a container from the custom image, mapping host port 8888 to the container’s port 80 . The container runs in detached mode ( -d ) and is named tinywan-nginx-test .

sudo docker run --name tinywan-nginx-test -p 8888:80 -d tinywan-image001:v1

Verification

After the container starts, open a web browser and navigate to http://<public‑IP>:8888. If the page displays the custom heading Welcome, Docker! 开源技术小栈, the Docker installation, image build, and container deployment are successful.