1。CICD学习docker安装

　　1.背景：
　　基于虚拟机，centeros7系统部署
　　2.清理docker（如果不是第一次安装）yum remove docker                    docker-client                    docker-client-latest                    docker-common                    docker-latest                    docker-latest-logrotate                    docker-logrotate                    docker-engine
　　3.部署docker相关依赖#1.需要的安装包 yum install -y yum-utils #2.更换Docker国内源仓库 yum-config-manager                               --add-repo      http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo      #3.更新软件包索引 yum makecache fast  #4.安装Docker引擎 docker-ce 社区版、docker-ee 企业版 yum install -y docker-ce docker-ce-cli containerd.io  #5.启动Docker systemctl start docker  #6.查看docker version  Client: Docker Engine - Community  Version:           20.10.12  API version:       1.41  Go version:        go1.16.12  Git commit:        e91ed57  Built:             Mon Dec 13 11:45:41 2021  OS/Arch:           linux/amd64  Context:           default  Experimental:      true  Server: Docker Engine - Community  Engine:   Version:          20.10.12   API version:      1.41 (minimum version 1.12)   Go version:       go1.16.12   Git commit:       459d0df   Built:            Mon Dec 13 11:44:05 2021   OS/Arch:          linux/amd64   Experimental:     false  containerd:   Version:          1.4.12   GitCommit:        7b11cfaabd73bb80907dd23182b9347b4245eb5d  runc:   Version:          1.0.2   GitCommit:        v1.0.2-0-g52b36a2  docker-init:   Version:          0.19.0   GitCommit:        de40ad0
　　4.docker之hello word
　　docker run hello-worldUnable to find image ＂hello-world:latest＂ locally latest: Pulling from library/hello-world 2db29710123e: Pull complete  Digest: sha256:2498fce14358aa50ead0cc6c19990fc6ff866ce72aeb5546e1d59caac3d0d60f 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/