linux centos7安装docker

在 CentOS 7 系统上安装 Docker 需要几个步骤：

1. **更新包列表**:

   sudo yum update -y

2. **添加 Docker GPG 公钥**:

   curl -fsSL https://download.docker.com/linux/centos/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

3. **配置仓库**:

   echo \
   "deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/centos/$(uname -m) $(lsb_release -cs) stable" \
   | sudo tee /etc/yum.repos.d/docker-ce.repo > /dev/null

4. **安装 Docker**:

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

5. **启动并启用 Docker**:

   sudo systemctl start docker
   sudo systemctl enable docker

6. **验证安装**:
可以通过运行 `sudo docker run hello-world` 来测试 Docker 是否已成功安装。