我们在普通用户下执行docker安装操作，所以需要加上sudo来暂时获取root权限。
安装相关软件：
[mall@VM_0_7_centos ~]$ sudo yum -y install yum-utils device-mapper-persistent-data 1vm2
配置仓库：
[mall@VM_0_7_centos ~]$ sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo [sudo] password for mall: 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
安装：
[mall@VM_0_7_centos ~]$ sudo yum install docker-ce Loaded plugins: fastestmirror, langpacks Loading mirror speeds from cached hostfile docker-ce-stable | 3.5 kB 00:00:00 (1/2): docker-ce-stable/x86_64/updateinfo | 55 B 00:00:00 (2/2): docker-ce-stable/x86_64/primary_db | 37 kB 00:00:00 Resolving Dependencies --> Running transaction check ---> Package docker-ce.x86_64 3:19.03.4-3.el7 will be installed --> Processing Dependency: container-selinux >= 2:2.74 for package: 3:docker-ce-19.03.4-3.el7.x86_64 --> Processing Dependency: containerd.io >= 1.2.2-3 for package: 3:docker-ce-19.03.4-3.el7.x86_64 --> Processing Dependency: docker-ce-cli for package: 3:docker-ce-19.03.4-3.el7.x86_64 --> Processing Dependency: libcgroup for package: 3:docker-ce-19.03.4-3.el7.x86_64 --> Running transaction check ---> Package container-selinux.noarch 2:2.107-3.el7 will be installed --> Processing Dependency: policycoreutils-python for package: 2:container-selinux-2.107-3.el7.noarch ---> Package containerd.io.x86_64 0:1.2.10-3.2.el7 will be installed ---> Package docker-ce-cli.x86_64 1:19.03.4-3.el7 will be installed ---> Package libcgroup.x86_64 0:0.41-21.el7 will be installed --> Running transaction check ---> Package policycoreutils-python.x86_64 0:2.5-33.el7 will be installed --> Processing Dependency: setools-libs >= 3.3.8-4 for package: policycoreutils-python-2.5-33.el7.x86_64 --> Processing Dependency: libsemanage-python >= 2.5-14 for package: policycoreutils-python-2.5-33.el7.x86_64 --> Processing Dependency: audit-libs-python >= 2.1.3-4 for package: policycoreutils-python-2.5-33.el7.x86_64 --> Processing Dependency: python-IPy for package: policycoreutils-python-2.5-33.el7.x86_64 --> Processing Dependency: libqpol.so.1(VERS_1.4)(64bit) for package: policycoreutils-python-2.5-33.el7.x86_64 --> Processing Dependency: libqpol.so.1(VERS_1.2)(64bit) for package: policycoreutils-python-2.5-33.el7.x86_64 --> Processing Dependency: libapol.so.4(VERS_4.0)(64bit) for package: policycoreutils-python-2.5-33.el7.x86_64 --> Processing Dependency: checkpolicy for package: policycoreutils-python-2.5-33.el7.x86_64 --> Processing Dependency: libqpol.so.1()(64bit) for package: policycoreutils-python-2.5-33.el7.x86_64 --> Processing Dependency: libapol.so.4()(64bit) for package: policycoreutils-python-2.5-33.el7.x86_64 --> Running transaction check ---> Package audit-libs-python.x86_64 0:2.8.5-4.el7 will be installed ---> Package checkpolicy.x86_64 0:2.5-8.el7 will be installed ---> Package libsemanage-python.x86_64 0:2.5-14.el7 will be installed ---> Package python-IPy.noarch 0:0.75-6.el7 will be installed ---> Package setools-libs.x86_64 0:3.3.8-4.el7 will be installed --> Finished Dependency Resolution Dependencies Resolved ======================================================================================================================================================================= Package Arch Version Repository Size ======================================================================================================================================================================= Installing: docker-ce x86_64 3:19.03.4-3.el7 docker-ce-stable 24 M Installing for dependencies: audit-libs-python x86_64 2.8.5-4.el7 os 76 k checkpolicy x86_64 2.5-8.el7 os 295 k container-selinux noarch 2:2.107-3.el7 extras 39 k containerd.io x86_64 1.2.10-3.2.el7 docker-ce-stable 23 M docker-ce-cli x86_64 1:19.03.4-3.el7 docker-ce-stable 39 M libcgroup x86_64 0.41-21.el7 os 66 k libsemanage-python x86_64 2.5-14.el7 os 113 k policycoreutils-python x86_64 2.5-33.el7 os 457 k python-IPy noarch 0.75-6.el7 os 32 k setools-libs x86_64 3.3.8-4.el7 os 620 k Transaction Summary ======================================================================================================================================================================= Install 1 Package (+10 Dependent packages) Total download size: 89 M Installed size: 368 M Is this ok [y/d/N]: y Downloading packages: (1/11): container-selinux-2.107-3.el7.noarch.rpm | 39 kB 00:00:00 (2/11): audit-libs-python-2.8.5-4.el7.x86_64.rpm | 76 kB 00:00:00 (3/11): checkpolicy-2.5-8.el7.x86_64.rpm | 295 kB 00:00:00 warning: /var/cache/yum/x86_64/7/docker-ce-stable/packages/docker-ce-19.03.4-3.el7.x86_64.rpm: Header V4 RSA/SHA512 Signature, key ID 621e9f35: NOKEY MB 00:00:04 ETA Public key for docker-ce-19.03.4-3.el7.x86_64.rpm is not installed (4/11): docker-ce-19.03.4-3.el7.x86_64.rpm | 24 MB 00:00:02 (5/11): containerd.io-1.2.10-3.2.el7.x86_64.rpm | 23 MB 00:00:02 (6/11): libcgroup-0.41-21.el7.x86_64.rpm | 66 kB 00:00:00 (7/11): libsemanage-python-2.5-14.el7.x86_64.rpm | 113 kB 00:00:00 (8/11): python-IPy-0.75-6.el7.noarch.rpm | 32 kB 00:00:00 (9/11): policycoreutils-python-2.5-33.el7.x86_64.rpm | 457 kB 00:00:00 (10/11): setools-libs-3.3.8-4.el7.x86_64.rpm | 620 kB 00:00:00 (11/11): docker-ce-cli-19.03.4-3.el7.x86_64.rpm | 39 MB 00:00:04 ----------------------------------------------------------------------------------------------------------------------------------------------------------------------- Total 14 MB/s | 89 MB 00:00:06 Retrieving key from https://download.docker.com/linux/centos/gpg Importing GPG key 0x621E9F35: Userid : "Docker Release (CE rpm) <docker@docker.com>" Fingerprint: 060a 61c5 1b55 8a7f 742b 77aa c52f eb6b 621e 9f35 From : https://download.docker.com/linux/centos/gpg Is this ok [y/N]: y Running transaction check Running transaction test Transaction test succeeded Running transaction Installing : libcgroup-0.41-21.el7.x86_64 1/11 Installing : setools-libs-3.3.8-4.el7.x86_64 2/11 Installing : audit-libs-python-2.8.5-4.el7.x86_64 3/11 Installing : python-IPy-0.75-6.el7.noarch 4/11 Installing : libsemanage-python-2.5-14.el7.x86_64 5/11 Installing : 1:docker-ce-cli-19.03.4-3.el7.x86_64 6/11 Installing : checkpolicy-2.5-8.el7.x86_64 7/11 Installing : policycoreutils-python-2.5-33.el7.x86_64 8/11 Installing : 2:container-selinux-2.107-3.el7.noarch 9/11 setsebool: SELinux is disabled. Installing : containerd.io-1.2.10-3.2.el7.x86_64 10/11 Installing : 3:docker-ce-19.03.4-3.el7.x86_64 11/11 Verifying : checkpolicy-2.5-8.el7.x86_64 1/11 Verifying : policycoreutils-python-2.5-33.el7.x86_64 2/11 Verifying : 1:docker-ce-cli-19.03.4-3.el7.x86_64 3/11 Verifying : 3:docker-ce-19.03.4-3.el7.x86_64 4/11 Verifying : libsemanage-python-2.5-14.el7.x86_64 5/11 Verifying : 2:container-selinux-2.107-3.el7.noarch 6/11 Verifying : python-IPy-0.75-6.el7.noarch 7/11 Verifying : audit-libs-python-2.8.5-4.el7.x86_64 8/11 Verifying : containerd.io-1.2.10-3.2.el7.x86_64 9/11 Verifying : setools-libs-3.3.8-4.el7.x86_64 10/11 Verifying : libcgroup-0.41-21.el7.x86_64 11/11 Installed: docker-ce.x86_64 3:19.03.4-3.el7 Dependency Installed: audit-libs-python.x86_64 0:2.8.5-4.el7 checkpolicy.x86_64 0:2.5-8.el7 container-selinux.noarch 2:2.107-3.el7 containerd.io.x86_64 0:1.2.10-3.2.el7 docker-ce-cli.x86_64 1:19.03.4-3.el7 libcgroup.x86_64 0:0.41-21.el7 libsemanage-python.x86_64 0:2.5-14.el7 policycoreutils-python.x86_64 0:2.5-33.el7 python-IPy.noarch 0:0.75-6.el7 setools-libs.x86_64 0:3.3.8-4.el7 Complete!
启动并验证：
[mall@VM_0_7_centos ~]$ sudo systemctl start docker [sudo] password for mall: [mall@VM_0_7_centos ~]$ sudo docker run hello-world Unable to find image 'hello-world:latest' locally latest: Pulling from library/hello-world 1b930d010525: Pull complete Digest: sha256:c3b4ada4687bbaa170745b3e4dd8ac3f194ca95b2d0518b417fb47e5879d9b5f 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/
起来后我们试试拉取一个mysql镜像：
[mall@VM_0_7_centos ~]$ sudo docker pull mysql:5.7 5.7: Pulling from library/mysql 80369df48736: Pull complete e8f52315cb10: Pull complete cf2189b391fc: Pull complete cc98f645c682: Pull complete 27a27ac83f74: Pull complete fa1f04453414: Pull complete d45bf7d22d33: Pull complete c7d49ffebc56: Pull complete 511a8052b204: Pull complete 5d5df4c12444: Pull complete d482603a2922: Pull complete Digest: sha256:44b33224e3c406bf50b5a2ee4286ed0d7f2c5aec1f7fdb70291f7f7c570284dd Status: Downloaded newer image for mysql:5.7 docker.io/library/mysql:5.7