Cenots安装Docker

一、添加Docker仓库

1.安装

yum install -y yum-utils device-mapper-persistent-data lvm2

yum-utils：管理repository及扩展包的工具提供了yum-config-manager
yum-config-manager：管理仓库用

yum-config-manager的选项使用：    yum-config-manager –add-repo“仓库路径” 添加仓库    yum-config-manager –disable “仓库名"      禁用仓库    yum-config-manager –enable  “仓库名”     启用仓库

device-mapper-persistent-data、lvm2：devicemapper存储驱动程序所必需的
devicemapper：Docker Engine基于Device Mapper提供的一种存储驱动
DeviceMapper：Linux系统中的高级卷管理技术框架

2.添加Docker仓库

yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

命令完成后你会发现 /etc/yum.repo/ 下多了个docker-ce.repo

二、安装Docker CE

1.这条命令会安装最新版的Docker

yum install docker-ce

2.安装特定版Docker

查看Docker CE的版本，从高到底排序

yum list docker-ce --showduplicates | sort -r

[root@localhost yum.repos.d]# yum list docker-ce --showduplicates | sort -r * updates: mirrors.163.comLoading mirror speeds from cached hostfileLoaded plugins: fastestmirrorInstalled Packages * extras: mirrors.zju.edu.cndocker-ce.x86_64            17.09.1.ce-1.el7.centos            docker-ce-stable docker-ce.x86_64            17.09.1.ce-1.el7.centos            @docker-ce-stabledocker-ce.x86_64            17.09.0.ce-1.el7.centos            docker-ce-stable docker-ce.x86_64            17.06.2.ce-1.el7.centos            docker-ce-stable docker-ce.x86_64            17.06.1.ce-1.el7.centos            docker-ce-stable docker-ce.x86_64            17.06.0.ce-1.el7.centos            docker-ce-stable docker-ce.x86_64            17.03.2.ce-1.el7.centos            docker-ce-stable docker-ce.x86_64            17.03.1.ce-1.el7.centos            docker-ce-stable docker-ce.x86_64            17.03.0.ce-1.el7.centos            docker-ce-stable 

安装特定版本对比上面的也就是两个前半截凑起来就是包名，比如：

docker-ce.x86_64            17.09.1.ce-1.el7.centos            docker-ce-stable 

安装就是：

yum install docker-ce-17.09.1.ce

三、下载一个image测试Docker

1.启动Docker

systemctl start docker

2.获取一个Docker image

docker search whalesay #这条命令会获取一个鲸鱼的小镜像

[root@localhost yum.repos.d]# docker search whalesayNAME                            DESCRIPTION                                     STARS               OFFICIAL            AUTOMATEDdocker/whalesay                 An image for use in the Docker demo tutorial    621                                     mendlik/docker-whalesay         Docker whalesay image from training materi...   6                                       [OK]sabs1117/whalesay               Whalesay with fortune phrases.                  1                                       nikovirtala/whalesay            Tiny Go web service to print Moby Dock ASC...   1                                       [OK]milanfort/whalesay              Modified docker/whalesay image that output...   1                                       swinton/whalesay                whalesay, innit                                 1                                       ojenge/whalesay                 from docker/whalesay                            1                                       caibar/whalesay                 Builds automatizados.                           1                                       [OK]jracionero/docker-whalesay      My smarter docker whalesay                      0                                       puneethp/whalesay               Docker-Whalesay                                 0                                       firecyberice/whalesay           Docker **Cloud** automated build for **amd...   0                                       forsingh/whalesay               whalesay                                        0                                       [OK]claytonrogers/docker-whalesay   Whalesay automated build                        0                                       [OK]asakilan/pg-whalesay            My whalesay                                     0                                       dhalljohnston/whalesay          whalesay                                        0                                       whalebrew/whalesay                                                              0                                       blaines/whalesay                                                                0                                       tiagoferreira/whalesay          Whalesay image                                  0                                       phyominhtun/whalesay            My whalesay image!                              0                                       liuzhishan/docker-whalesay      docker-whalesay                                 0                                       laveshin/whalesay               whalesay image                                  0                                       hongxi/whalesay-fortunes        Demo, the whalesay-fortunes                     0                                       jetolabs/whalesay               whalesay with fortune cookie messages           0                                       nateliu/whalesay                first test of whalesay                          0                                       bjarkebard/whalesay             testing whalesay                                0 

3.将image pull下来到本地

docker pull docker/whalesay

[root@localhost yum.repos.d]# docker pull docker/whalesayUsing default tag: latestlatest: Pulling from docker/whalesaye190868d63f8: Pull complete 909cd34c6fd7: Pull complete 0b9bfabab7c1: Pull complete a3ed95caeb02: Pull complete 00bf65475aba: Pull complete c57b6bcc83e3: Pull complete 8978f6879e2f: Pull complete 8eed3712d2cf: Pull complete Digest: sha256:178598e51a26abbc958b8a2e48825c90bc22e641de3d31e18aaf55f3258ba93bStatus: Downloaded newer image for docker/whalesay:latest

4.查看刚刚pull下来的镜像

docker images

[root@localhost yum.repos.d]# docker imagesREPOSITORY          TAG                 IMAGE ID            CREATED             SIZEdocker/whalesay     latest              6b362a9f73eb        2 years ago         247MB

5.启动容器打出hello world

docker run docker/whalesay cowsay hello world

[root@localhost yum.repos.d]# docker run docker/whalesay cowsay hello world _____________ < hello world > -------------     \     \      \                         ##        .                          ## ## ##       ==                       ## ## ## ##      ===                   /""""""""""""""""___/ ===          ~~~ {~~ ~~~~ ~~~ ~~~~ ~~ ~ /  ===- ~~~          \______ o          __/                    \    \        __/                       \____\______/