centos下docker安装

一、设置存储库

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

　执行结果

已加载插件：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<br>repo saved to /etc/yum.repos.d/docker-ce.repo

二、安装docker-ce(docker-ce是社区免费版，docker-ee是企业版）

1	`yum` `install` `-y docker-ce`

出现错误

1	`获取 GPG 密钥失败：[Errno 14] curl#35 - "Network file descriptor is not connected"`

到http://mirrors.163.com找到对应版本

1	`rpm --import` `http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7`

再次安装docker-ce成功

三、启动docker

1	`systemctl daemon-reload && systemctl start docker`

　　验证

1	`docker version`

Client: Docker Engine - Community
 Version:           19.03.7
 API version:       1.40
 Go version:        go1.12.17
 Git commit:        7141c199a2
 Built:             Wed Mar  4 01:24:10 2020
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          19.03.7
  API version:      1.40 (minimum version 1.12)
  Go version:       go1.12.17
  Git commit:       7141c199a2
  Built:            Wed Mar  4 01:22:45 2020
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.2.13
  GitCommit:        7ad184331fa3e55e52b890ea95e65ba581ae3429
 runc:
  Version:          1.0.0-rc10
  GitCommit:        dc9208a3303feef5b3839f4323d9beb36df0a9dd
 docker-init:
  Version:          0.18.0
  GitCommit:        fec3683

四、运行hello word!

先login（官方文档上说运行helloword不需要login，但会出现docker: Error response from daemon: pull access denied for hell-world, repository does not exist or may require 'docker login': denied: requested access to the resource is denied.错误）

[root@localhost data]# docker run hello-world
Unable to find image 'hell-world:latest' locally
docker: Error response from daemon: pull access denied for hell-world, repository does not exist or may require 'docker login': denied: requested access to the resource is denied.
See 'docker run --help'.
[root@localhost data]# docker login
Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one.
Username: xxxxx
Password: 
WARNING! Your password will be stored unencrypted in /root/.docker/config.json.
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store
 
Login Succeeded

　运行hello-world

[root@localhost data]# docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
1b930d010525: Pull complete 
Digest: sha256:fc6a51919cfeb2e6763f62b6d9e8815acbf7cd2e476ea353743570610737b752
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/