一、docker的官方安装文档：
https://docs.docker.com/engine/installation/linux/centos/
由docker给的文档可以看出它也只是去配置了一个docker的yum源、然后就通过这个源来安装docker了；在这个文档下我们采用手工配置
的方式
二、配置一个docker用的源：
1、为docker 增加一个新的yum配置文件；touch /etc/yum.repos.d/docker.repo
touch /etc/yum.repos.d/docker.repo
2、docker.repo的内容如下
[docker-ce-stable] name=Docker CE Stable - $basearch baseurl=https://download.docker.com/linux/centos/7/$basearch/stable enabled=1 gpgcheck=0 #我把这里设置成了0、说明我信任了这个源，不对它的rpm进行检察 gpgkey=https://download.docker.com/linux/centos/gpg [docker-ce-stable-debuginfo] name=Docker CE Stable - Debuginfo $basearch baseurl=https://download.docker.com/linux/centos/7/debug-$basearch/stable enabled=0 gpgcheck=1 gpgkey=https://download.docker.com/linux/centos/gpg [docker-ce-stable-source] name=Docker CE Stable - Sources baseurl=https://download.docker.com/linux/centos/7/source/stable enabled=0 gpgcheck=1 gpgkey=https://download.docker.com/linux/centos/gpg [docker-ce-edge] name=Docker CE Edge - $basearch baseurl=https://download.docker.com/linux/centos/7/$basearch/edge enabled=0 gpgcheck=1 gpgkey=https://download.docker.com/linux/centos/gpg [docker-ce-edge-debuginfo] name=Docker CE Edge - Debuginfo $basearch baseurl=https://download.docker.com/linux/centos/7/debug-$basearch/edge enabled=0 gpgcheck=1 gpgkey=https://download.docker.com/linux/centos/gpg [docker-ce-edge-source] name=Docker CE Edge - Sources baseurl=https://download.docker.com/linux/centos/7/source/edge enabled=0 gpgcheck=1 gpgkey=https://download.docker.com/linux/centos/gpg [docker-ce-test] name=Docker CE Test - $basearch baseurl=https://download.docker.com/linux/centos/7/$basearch/test enabled=0 gpgcheck=1 gpgkey=https://download.docker.com/linux/centos/gpg [docker-ce-test-debuginfo] name=Docker CE Test - Debuginfo $basearch baseurl=https://download.docker.com/linux/centos/7/debug-$basearch/test enabled=0 gpgcheck=1 gpgkey=https://download.docker.com/linux/centos/gpg [docker-ce-test-source] name=Docker CE Test - Sources baseurl=https://download.docker.com/linux/centos/7/source/test enabled=0 gpgcheck=1 gpgkey=https://download.docker.com/linux/centos/gpg
三、安装docker:
sudo yum install docker-ce Loaded plugins: fastestmirror, langpacks Loading mirror speeds from cached hostfile Resolving Dependencies --> Running transaction check ---> Package docker-ce.x86_64 0:17.03.1.ce-1.el7.centos will be installed --> Processing Dependency: docker-ce-selinux >= 17.03.1.ce-1.el7.centos for package: docker-ce-17.03.1.ce-1.el7.centos.x86_64 --> Running transaction check ---> Package docker-ce-selinux.noarch 0:17.03.1.ce-1.el7.centos will be installed --> Finished Dependency Resolution Dependencies Resolved ===================================================================================================================================== Package Arch Version Repository Size ===================================================================================================================================== Installing: docker-ce x86_64 17.03.1.ce-1.el7.centos docker-ce-stable 19 M Installing for dependencies: docker-ce-selinux noarch 17.03.1.ce-1.el7.centos docker-ce-stable 28 k Transaction Summary ===================================================================================================================================== Install 1 Package (+1 Dependent package) Total download size: 19 M Installed size: 19 M Is this ok [y/d/N]: y
四、直接下载rpm包的方式来安装：
1、我在安装docker的时候发现下载的速度只有3kB/s 然而文件大小有19M；就在我感觉安装无望的时候、我机智的想到了自己直接把rpm下载下来
看了下docker.repo 、发现centos7的源地址是 https://download.docker.com/linux/centos/7/$basearch/stable 所以我只要去
https://download.docker.com/linux/centos/7/x86_64/stable/Packages/
用迅雷(我是会员有加速)把rpm包下载下来就行了
下载如下文件：
docker-ce-17.03.0.ce-1.el7.centos.x86_64.rpm docker-ce-selinux-17.03.0.ce-1.el7.centos.noarch.rpm
五、安装docker:
ll total 19096 -rwxrwxrwx 1 jianglexing jianglexing 19521288 May 30 20:05 docker-ce-17.03.0.ce-1.el7.centos.x86_64.rpm -rw-r--r-- 1 jianglexing jianglexing 29108 May 30 20:15 docker-ce-selinux-17.03.0.ce-1.el7.centos.noarch.rpm [root@workstudio docker]# yum localinstall * Loaded plugins: fastestmirror, langpacks Examining docker-ce-17.03.0.ce-1.el7.centos.x86_64.rpm: docker-ce-17.03.0.ce-1.el7.centos.x86_64 Marking docker-ce-17.03.0.ce-1.el7.centos.x86_64.rpm to be installed Examining docker-ce-selinux-17.03.0.ce-1.el7.centos.noarch.rpm: docker-ce-selinux-17.03.0.ce-1.el7.centos.noarch Marking docker-ce-selinux-17.03.0.ce-1.el7.centos.noarch.rpm to be installed Resolving Dependencies --> Running transaction check ---> Package docker-ce.x86_64 0:17.03.0.ce-1.el7.centos will be installed ---> Package docker-ce-selinux.noarch 0:17.03.0.ce-1.el7.centos will be installed --> Finished Dependency Resolution Dependencies Resolved ===================================================================================================================================== Package Arch Version Repository Size ===================================================================================================================================== Installing: docker-ce x86_64 17.03.0.ce-1.el7.centos /docker-ce-17.03.0.ce-1.el7.centos.x86_64 65 M docker-ce-selinux noarch 17.03.0.ce-1.el7.centos /docker-ce-selinux-17.03.0.ce-1.el7.centos.noarch 43 k Transaction Summary ===================================================================================================================================== Install 2 Packages Total size: 65 M Installed size: 65 M Is this ok [y/d/N]: y Downloading packages: Running transaction check Running transaction test Transaction test succeeded Running transaction Installing : docker-ce-selinux-17.03.0.ce-1.el7.centos.noarch 1/2 setsebool: SELinux is disabled. libsemanage.semanage_direct_install_info: Overriding docker module at lower priority 100 with module at priority 400. Installing : docker-ce-17.03.0.ce-1.el7.centos.x86_64 2/2 Verifying : docker-ce-17.03.0.ce-1.el7.centos.x86_64 1/2 Verifying : docker-ce-selinux-17.03.0.ce-1.el7.centos.noarch 2/2 Installed: docker-ce.x86_64 0:17.03.0.ce-1.el7.centos docker-ce-selinux.noarch 0:17.03.0.ce-1.el7.centos Complete!
六、启动docker:
[root@workstudio docker]# systemctl start docker [root@workstudio docker]# ps -ef | grep docker root 4458 1 1 20:22 ? 00:00:00 /usr/bin/dockerd root 4465 4458 0 20:22 ? 00:00:00 docker-containerd -l unix:///var/run/docker/libcontainerd/docker-containerd.sock --metrics-interval=0 --start-timeout 2m --state-dir /var/run/docker/libcontainerd/containerd --shim docker-containerd-shim --runtime docker-runc root 4589 4333 0 20:22 pts/1 00:00:00 grep --color=auto docker
七、测试docker是否能成功运行：
[root@workstudio docker]# docker run hello-world Unable to find image 'hello-world:latest' locally latest: Pulling from library/hello-world 78445dd45222: Pull complete Digest: sha256:c5515758d4c5e1e838e9cd307f6c6a0d620b5e07e6f927b07d05f6d12a1ac8d7 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. 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://cloud.docker.com/ For more examples and ideas, visit: https://docs.docker.com/engine/userguide/
如下是第一次运行hello-world 这个docker-image 由于它还不存在于本地、所以要下载它、这可能要用一点时间！
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