环境

首先给大家看一下我的系统 CentOS 7：

[root@wsuo ~]# uname -r
3.10.0-514.26.2.el7.x86_64
[root@wsuo ~]# cat /etc/os-release 
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"

安装

安装依赖：

sudo yum remove docker \docker-client \docker-client-latest \docker-common \docker-latest \docker-latest-logrotate \docker-logrotate \docker-engine

安装工具包：

sudo yum install -y yum-utils

配置远程仓库的地址：

sudo yum-config-manager \--add-repo \http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

下面我们开始安装，在安装之前先清理一下缓存：

yum makecache fast

然后安装：

sudo yum install docker-ce docker-ce-cli containerd.io

信息如下：

他会问你要不要下载，输入 y 即可：

Install  3 Packages (+9 Dependent packages)
Upgrade             ( 3 Dependent packages)Total download size: 91 M
Is this ok [y/d/N]: y

然后还会让你两次确认，也是输入 y 即可：

Is this ok [y/N]: y
Is this ok [y/N]: y

当你看到如下信息就表示安装成功了：

Installed:containerd.io.x86_64 0:1.2.13-3.2.el7          docker-ce.x86_64 3:19.03.9-3.el7          docker-ce-cli.x86_64 1:19.03.9-3.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 2:2.119.1-1.c57a6f9.el7    libcgroup.x86_64 0:0.41-21.el7                 libseccomp.x86_64 0:2.3.1-4.el7     libsemanage-python.x86_64 0:2.5-14.el7              policycoreutils-python.x86_64 0:2.5-34.el7     python-IPy.noarch 0:0.75-6.el7      setools-libs.x86_64 0:3.3.8-4.el7                   Dependency Updated:audit.x86_64 0:2.8.5-4.el7              audit-libs.x86_64 0:2.8.5-4.el7              policycoreutils.x86_64 0:2.5-34.el7             Complete!

启动并测试

启动的命令：

sudo systemctl start docker

输入 docker version，如果看到以下信息则代表启动成功：

[root@wsuo ~]# docker version
Client: Docker Engine - CommunityVersion:           19.03.9API version:       1.40Go version:        go1.13.10Git commit:        9d988398e7Built:             Fri May 15 00:25:27 2020OS/Arch:           linux/amd64Experimental:      falseServer: Docker Engine - CommunityEngine:Version:          19.03.9API version:      1.40 (minimum version 1.12)Go version:       go1.13.10Git commit:       9d988398e7Built:            Fri May 15 00:24:05 2020OS/Arch:          linux/amd64Experimental:     falsecontainerd:Version:          1.2.13GitCommit:        7ad184331fa3e55e52b890ea95e65ba581ae3429runc:Version:          1.0.0-rc10GitCommit:        dc9208a3303feef5b3839f4323d9beb36df0a9dddocker-init:Version:          0.18.0GitCommit:        fec3683

测试 hello-world：

[root@wsuo ~]# sudo docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
0e03bdcc26d7: Pull complete 
Digest: sha256:6a65f928fb91fcfbc963f7aa6d57c8eeb426ad9a20c7ee045538ef34847f44f1
Status: Downloaded newer image for hello-world:latestHello from Docker!
This message shows that your installation appears to be working correctly.

查看已有的镜像：

[root@wsuo ~]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
hello-world         latest              bf756fb1ae65        4 months ago        13.3kB

卸载

如果你想卸载的话直需两步：

sudo yum remove docker-ce docker-ce-cli containerd.io
sudo rm -rf /var/lib/docker

阿里云镜像加速

登陆阿里云选择容器镜像服务：
刚开始他会让你开通服务：

点击一下他会让你设置密码，设置一下即可。

然后选择镜像加速器：

分为这四步即可配置成功：

1.sudo mkdir -p /etc/docker2.sudo tee /etc/docker/daemon.json <<-'EOF'
{"registry-mirrors": ["https://cl9be4py.mirror.aliyuncs.com"]
}
EOF3.sudo systemctl daemon-reload
4.sudo systemctl restart docker

Docker 的原理

• Docker 的守护进程运行在主机上，通过 Socket 从客户端访问；
• Docker-Server 接收到 Docker-Client 的指令，就会执行这个指令。

Docker 为什么比虚拟机快？

• Docker 利用的是宿主机的内核，而虚拟机是重新搭建一个 OS；

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巨人的肩膀：

• https://docs.docker.com/engine/install/centos/
• https://www.bilibili.com/video/BV1og4y1q7M4?p=9