卸載舊版本Docker避免沖突，2. 安裝yum-utils并添加官方Docker倉(cāng)庫(kù)，3. 安裝Docker CE、CLI和containerd，4. 啟動(dòng)并啟用Docker服務(wù)，5. 運(yùn)行hello-world鏡像驗(yàn)證安裝成功，6. 可選配置非root用戶運(yùn)行Docker。
To install Docker on CentOS, follow these steps to ensure a clean and working setup. This guide applies to CentOS 7 and later versions, using the official Docker repository for the most up-to-date version.
1. Uninstall Old Docker Versions (if any)
If you previously installed Docker from the default CentOS repositories, remove those packages first to avoid conflicts:
sudo yum remove docker \????????????docker-client \
????????????docker-client-latest \
????????????docker-common \
????????????docker-latest \
????????????docker-latest-logrotate \
????????????docker-logrotate \
????????????docker-engine
2. Set Up the Docker Repository
Install required dependencies to allow yum to use HTTPS repositories:
sudo yum install -y yum-utilsAdd the official Docker repository:
sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo3. Install Docker Engine
Update the package index and install Docker Community Edition along with containerd:
sudo yum install docker-ce docker-ce-cli containerd.ioThis installs the latest stable version of Docker. If you want a specific version, list available ones:
sudo yum list docker-ce --showduplicates | sort -rThen install by version number if needed:
sudo yum install docker-ce-4. Start and Enable Docker
After installation, start the Docker service and enable it to run at boot:
sudo systemctl start dockersudo systemctl enable docker
Verify it’s running:
sudo systemctl status docker5. Test Docker Installation
Run a simple test container to confirm everything works:
sudo docker run hello-worldThis downloads a test image and runs it in a container. If you see a “Hello from Docker” message, the installation was successful.
6. (Optional) Manage Docker as a Non-Root User
To avoid using sudo every time you run Docker, create a docker group and add your user:
sudo groupadd dockersudo usermod -aG docker $USER
Log out and back in for the group change to take effect. Then test without sudo:
docker run hello-worldBasically that's it. Docker is now installed and ready to use on your CentOS system.
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