sudo yum-config-manager > --add-repo > https://download.docker.com/linux/centos/docker-ce.repo
Loaded plugins: fastestmirror, langpacks adding repo from: https://download.docker.com/linux/centos/docker-ce.repo grabbing file https://download.docker.com/linux/centos/docker-ce.repo to /etc/yum.repos.d/docker-ce.repo repo saved to /etc/yum.repos.d/docker-ce.repo [root@dbnode8 system]# sudo yum -y install docker-ce Loaded plugins: fastestmirror, langpacks Loading mirror speeds from cached hostfile Resolving Dependencies --> Running transaction check ---> Package docker-ce.x86_64 3:20.10.10-3.el7 will be installed --> Processing Dependency: container-selinux >= 2:2.74 for package: 3:docker-ce-20.10.10-3.el7.x86_64 --> Processing Dependency: containerd.io >= 1.4.1 for package: 3:docker-ce-20.10.10-3.el7.x86_64 --> Processing Dependency: docker-ce-cli for package: 3:docker-ce-20.10.10-3.el7.x86_64 --> Processing Dependency: docker-ce-rootless-extras for package: 3:docker-ce-20.10.10-3.el7.x86_64 --> Running transaction check ---> Package container-selinux.noarch 2:2.119.2-1.911c772.el7_8 will be installed ---> Package containerd.io.x86_64 0:1.4.11-3.1.el7 will be installed ---> Package docker-ce-cli.x86_64 1:20.10.10-3.el7 will be installed --> Processing Dependency: docker-scan-plugin(x86-64) for package: 1:docker-ce-cli-20.10.10-3.el7.x86_64 ---> Package docker-ce-rootless-extras.x86_64 0:20.10.10-3.el7 will be installed --> Running transaction check ---> Package docker-scan-plugin.x86_64 0:0.9.0-3.el7 will be installed --> Finished Dependency Resolution Dependencies Resolved ============================================================================================================================================= Package Arch Version Repository Size ============================================================================================================================================= Installing: docker-ce x86_64 3:20.10.10-3.el7 docker-ce-stable 23 M Installing for dependencies: container-selinux noarch 2:2.119.2-1.911c772.el7_8 extras 40 k containerd.io x86_64 1.4.11-3.1.el7 docker-ce-stable 28 M docker-ce-cli x86_64 1:20.10.10-3.el7 docker-ce-stable 29 M docker-ce-rootless-extras x86_64 20.10.10-3.el7 docker-ce-stable 8.0 M docker-scan-plugin x86_64 0.9.0-3.el7 docker-ce-stable 3.7 M Transaction Summary ============================================================================================================================================= Install 1 Package (+5 Dependent packages) Total download size: 92 M Installed size: 376 M Downloading packages: (1/6): container-selinux-2.119.2-1.911c772.el7_8.noarch.rpm | 40 kB 00:00:00 (2/6): docker-ce-20.10.10-3.el7.x86_64.rpm | 23 MB 00:00:01 (3/6): docker-ce-cli-20.10.10-3.el7.x86_64.rpm | 29 MB 00:00:01 (4/6): docker-ce-rootless-extras-20.10.10-3.el7.x86_64.rpm | 8.0 MB 00:00:00 (5/6): docker-scan-plugin-0.9.0-3.el7.x86_64.rpm | 3.7 MB 00:00:00 (6/6): containerd.io-1.4.11-3.1.el7.x86_64.rpm | 28 MB 00:00:08 --------------------------------------------------------------------------------------------------------------------------------------------- Total 11 MB/s | 92 MB 00:00:08 Running transaction check Running transaction test Transaction test succeeded Running transaction Installing : 2:container-selinux-2.119.2-1.911c772.el7_8.noarch 1/6 setsebool: SELinux is disabled. Installing : containerd.io-1.4.11-3.1.el7.x86_64 2/6 Installing : 1:docker-ce-cli-20.10.10-3.el7.x86_64 3/6 Installing : docker-scan-plugin-0.9.0-3.el7.x86_64 4/6 Installing : 3:docker-ce-20.10.10-3.el7.x86_64 5/6 Installing : docker-ce-rootless-extras-20.10.10-3.el7.x86_64 6/6 Verifying : docker-ce-rootless-extras-20.10.10-3.el7.x86_64 1/6 Verifying : docker-scan-plugin-0.9.0-3.el7.x86_64 2/6 Verifying : 3:docker-ce-20.10.10-3.el7.x86_64 3/6 Verifying : containerd.io-1.4.11-3.1.el7.x86_64 4/6 Verifying : 2:container-selinux-2.119.2-1.911c772.el7_8.noarch 5/6 Verifying : 1:docker-ce-cli-20.10.10-3.el7.x86_64 6/6 Installed: docker-ce.x86_64 3:20.10.10-3.el7 Dependency Installed: container-selinux.noarch 2:2.119.2-1.911c772.el7_8 containerd.io.x86_64 0:1.4.11-3.1.el7 docker-ce-cli.x86_64 1:20.10.10-3.el7 docker-ce-rootless-extras.x86_64 0:20.10.10-3.el7 docker-scan-plugin.x86_64 0:0.9.0-3.el7 Complete!
安装成功！
二、开启Dockersudo systemctl start docker
测试：docker run hello-world
docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
2db29710123e: Pull complete
Digest: sha256:37a0b92b08d4919615c3ee023f7ddb068d12b8387475d64c622ac30f45c29c51
Status: Downloaded newer image for hello-world:latest
Hello from Docker!
This message shows that your installation appears to be working correctly.
To generate this message, Docker took the following steps:
1. The Docker client contacted the Docker daemon.
2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
(amd64)
3. The Docker daemon created a new container from that image which runs the
executable that produces the output you are currently reading.
4. The Docker daemon streamed that output to the Docker client, which sent it
to your terminal.
To try something more ambitious, you can run an Ubuntu container with:
$ docker run -it ubuntu bash
Share images, automate workflows, and more with a free Docker ID:
https://hub.docker.com/
For more examples and ideas, visit:
https://docs.docker.com/get-started/
证明安装成功，并成功开启应用。
三、关闭Dockersystemctl stop docker四、重启Docker
systemctl restart docker五、配置镜像加速文件
国内网络较慢，拉取docker镜像比较慢，因此需要配置镜像加速文件 /etc/docker/daemon.json
vi /etc/docker/daemon.json
修改daemon.json文件如下所示：
{
"registry-mirrors":["https://tnxkcsol.mirror.aliyuncs.com"]
}
至此，Docker安装成功！
