meface/docker_install.md at c4e8f7c0dc16c780817fed46f623502cfbf3709b

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1.查看环境

因为Docker对系统环境有要求，如unbuntu

qiusj@u20:~$ uname -r
5.4.0-7634-generic

qiusj@u20:~$ cat /etc/os-release
NAME="Pop!_OS"
VERSION="20.04 LTS"
ID=pop
ID_LIKE="ubuntu debian"
PRETTY_NAME="Pop!_OS 20.04 LTS"
VERSION_ID="20.04"
HOME_URL="https://pop.system76.com"
SUPPORT_URL="https://support.system76.com"
BUG_REPORT_URL="https://github.com/pop-os/pop/issues"
PRIVACY_POLICY_URL="https://system76.com/privacy"
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal
LOGO=distributor-logo-pop-os

2.安装(docker-ce社区版)

方式一：使用官方安装脚本自动安装

$ curl -fsSL https://get.docker.com | bash -s docker --mirror Aliyun

# 或使用国内daocloud 一键安装命令
$ curl -sSL https://get.daocloud.io/docker | sh

方式二：手动安装

#  1）卸载旧的版本
$ sudo apt-get remove docker docker-engine docker.io containerd runc

#  2）通过docker仓库安装，先安装需要的依赖环境
$ sudo apt-get update
$ sudo apt-get install \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg-agent \
    software-properties-common

# 3)添加Docker官方的GPG 密钥，验证key的指纹
$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
$  sudo apt-key fingerprint 0EBFCD88
pub   rsa4096 2017-02-22 [SCEA]
      9DC8 5822 9FC7 DD38 854A  E2D8 8D81 803C 0EBF CD88
uid           [ 未知 ] Docker Release (CE deb) <docker@docker.com>
sub   rsa4096 2017-02-22 [S]

# 4）添加稳定的镜像仓库
# $ sudo add-apt-repository \
#   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
#   $(lsb_release -cs) \
#   stable"
# 使用国内阿里云仓库
$ sudo add-apt-repository \ "deb [arch=amd64] https://mirrors.aliyun.com/docker-ce/linux/ubuntu \ $(lsb_release -cs) \ stable"

#访问源列表里的每个网址，并读取软件列表，然后保存在本地电脑。
$ sudo apt-get update

# 5）安装最新的docker ce 和 containerd
$ sudo apt-get install docker-ce docker-ce-cli containerd.io

# 查看验证docker是否安装成功
$ sudo docker run hello-world

Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
0e03bdcc26d7: Pull complete
Digest: sha256:49a1c8800c94df04e9658809b006fd8a686cab8028d33cfba2cc049724254202
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/

# 6）设置开机自启动并启动 Docker-ce(安装成功后默认已设置并启动，可忽略)
sudo systemctl enable docker
sudo systemctl start docker


# 7)卸载docker(卸载依赖，删除目录：/var/lib/docker是docker的默认工作路径)
$ sudo apt-get purge docker-ce docker-ce-cli containerd.io
$ sudo rm -rf /var/lib/docker

三

# 会导致docker的版本过低
yum install docker -y
systemctl start docker

# 卸载掉
yum -y remove docker*
# 添加依赖
sudo yum install -y yum-utils
# t
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo 
# 安装docker-ce
yum install docker-ce docker-ce-cli containerd.io

3.配置镜像加速

这里使用阿里云镜像加速。

登陆阿里云，找到容器镜像服务，找到镜像加速器。

配置使用

qiusj@u20:~$ sudo mkdir -p /etc/docker
[sudo] qiusj 的密码：
qiusj@u20:~$ sudo tee /etc/docker/daemon.json <<-'EOF'
> {
>   "registry-mirrors": ["https://gbi3l7ww.mirror.aliyuncs.com"]
> }
> EOF
{
  "registry-mirrors": ["https://gbi3l7ww.mirror.aliyuncs.com"]
}
qiusj@u20:~$ sudo systemctl daemon-reload
qiusj@u20:~$ sudo systemctl restart docker

4. 运行流程

在手动安装环节，我们为了验证docker是否安装成功运行一个hello-world镜像，其中run命令的运行流程如下图：

5.底层工作原理

Docker是一个Client-Server结构的系统，Docker的守护进程运行在主机上。通过Socket从客户端访问，当DockerServer接收到Docker-Client的指令后就会执行该指令。

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