【安装docker】使用云主机（centos7.6）安装和验证docker环境

• 版本要求：查看内核版本，需要大于3.10

[root@ecs-1021 ~]# uname -r 

• 如果内核版本过低，需要更新内核：

[root@ecs-1021 ~]# yum update

• Docker所需安装包所在网址

https://download.docker.com/linux/centos/7/x86_64/stable/Packages/

• 将rpm包直接下载到系统中

[root@ecs-1021 ~]# wget https://download.docker.com/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.6-3.3.el7.x8
[root@ecs-1021 ~]# wget https://download.docker.com/linux/centos/7/x86_64/stable/Packages/docker-ce-18.09.7-3.el7.x86_64.rpm6_64.rpm

[root@ecs-1021 ~]# wget https://download.docker.com/linux/centos/7/x86_64/stable/Packages/docker-ce-cli-18.09.7-3.el7.x86_64.rpm

• 安装docker（注意安装的顺序）

[root@ecs-1021 ~]# yum install -y containerd.io-1.2.6-3.3.el7.x86_64.rpm

[root@ecs-1021 ~]# yum -y install docker-ce-cli-18.09.7-3.el7.x86_64.rpm

[root@ecs-1021 ~]# yum -y install docker-ce-18.09.7-3.el7.x86_64.rpm

• 查看docker版本

[root@ecs-1021 ~]# docker --version 

• 启动docker并设置开机启动

[root@ecs-1021 ~]# systemctl start docker 

[root@ecs-1021 ~]# systemctl enable docker 

• 测试

[root@ecs-1021 ~]# docker run hello-world

Unable to find image 'hello-world:latest' locally

latest: Pulling from library/hello-world

1b930d010525: Pull complete

Digest: sha256:41a65640635299bab090f783209c1e3a3f11934cf7756b09cb2f1e02147c6ed8

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/