Demo Docker Engine Setup CentOS

Learn how to quickly install and configure Docker Engine (Community Edition) on a CentOS 7 server. This guide covers uninstalling old packages, setting up the official Docker repository, installing Docker CE, and verifying your installation.

Note

Always refer to the official Docker documentation for the most up-to-date installation instructions.

Prerequisites

Requirement	Details
Operating System	CentOS 7 (x86_64)
User Account	A non-root user with `sudo` privileges
Enabled Repository	`CentOS Extras`
Server Access	SSH access to your instance or VM

ssh centos@docker-centos

1. Remove Older Docker Versions

Before installing Docker CE, remove any legacy packages to prevent conflicts:

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

Verify your enabled repos:

sudo yum repolist

You should see base, extras, and updates in the list.

Warning

Removing old Docker packages will not delete your images or containers stored under /var/lib/docker, but it’s a good idea to back up any critical data before proceeding.

2. Install Dependencies & Configure the Docker Repository

Install yum-utils, which provides the yum-config-manager utility:
```
sudo yum install -y yum-utils
```

Add the official Docker CE repository:

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

Confirm the new repo is enabled:
```
sudo yum repolist | grep docker-ce
```

You should see an entry similar to docker-ce-stable/x86_64.

3. Install Docker Engine (Docker CE)

Install Docker Engine and its core components:

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

Verify that the Docker packages are installed:

sudo rpm -qa | grep -i docker

Expected packages in the output:

docker-ce
docker-ce-cli
containerd.io

4. Start and Enable the Docker Service

Check the Docker service status:
```
systemctl status docker
```
If it’s not running, start and enable it to launch on boot:
```
sudo systemctl start docker
sudo systemctl enable docker
```
Re-check to ensure Docker is active:
```
systemctl status docker
```

5. Verify Your Docker Installation

Check Docker version:

sudo docker --version

Sample output:

Docker version 19.03.13, build 4484c46d9d

View detailed client/server info:
```
sudo docker version
```
Display full system information:
```
sudo docker system info
```

When you see information about the Engine, containerd, runc, and your host environment, Docker is installed and running correctly.

Congratulations! You have successfully installed and configured Docker Engine on CentOS 7.

Links and References

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