运行操作系统： 

docker01:/etc/apt$ cat /etc/issue

Ubuntu 20.10 \n \l

参考文档：docker官网文档

Install Docker Engine on Ubuntu | Docker Documentation

一、安装docker

安装依赖：

docker01:/etc/apt$ sudo apt-get install apt-transport-https ca-certificates curl gnupg lsb-release

添加信任的GPG key

@docker01:~$ curl -fsSL  https://download.docker.com/linux/ubuntu/gpg |sudo gpg  --dearmor  -o  /usr/share/keyrings/docker-archive-keyring.gpg

添加docker的镜像源

docker01:/etc/apt$ echo "deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

docker01:/etc/apt$ sudo apt-get update

安装docker

docker01:/etc/apt$ sudo apt-get install docker-ce docker-ce-cli containerd.io

添加docker服务开机自启动，并启动docker

docker01:/etc/apt$ sudo systemctl enable docker

查看docker 服务状态

docker01:/etc/apt$ sudo systemctl status docker

● docker.service - Docker Application Container Engine

    Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)

    Active: active (running) since Wed 2021-09-08 22:24:13 CST; 4min 53s ago

TriggeredBy: ● docker.socket

      Docs: https://docs.docker.com

  Main PID: 9398 (dockerd)

      Tasks: 8

    Memory: 28.8M

    CGroup: /system.slice/docker.service

            └─9398 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock

Sep 08 22:24:13 docker01 dockerd[9398]: time="2021-09-08T22:24:13.197566481+08:00" level=warning msg="Your kernel does not support CPU realtime scheduler"

Sep 08 22:24:13 docker01 dockerd[9398]: time="2021-09-08T22:24:13.197643255+08:00" level=warning msg="Your kernel does not support cgroup blkio weight"

Sep 08 22:24:13 docker01 dockerd[9398]: time="2021-09-08T22:24:13.197658253+08:00" level=warning msg="Your kernel does not support cgroup blkio weight_device"

Sep 08 22:24:13 docker01 dockerd[9398]: time="2021-09-08T22:24:13.198185693+08:00" level=info msg="Loading containers: start."

Sep 08 22:24:13 docker01 dockerd[9398]: time="2021-09-08T22:24:13.436407447+08:00" level=info msg="Default bridge (docker0) is assigned with an IP address 172.17.0.0/16. Dae>

Sep 08 22:24:13 docker01 dockerd[9398]: time="2021-09-08T22:24:13.531857430+08:00" level=info msg="Loading containers: done."

Sep 08 22:24:13 docker01 dockerd[9398]: time="2021-09-08T22:24:13.616001469+08:00" level=info msg="Docker daemon" commit=75249d8 graphdriver(s)=overlay2 version=20.10.8

Sep 08 22:24:13 docker01 dockerd[9398]: time="2021-09-08T22:24:13.616363666+08:00" level=info msg="Daemon has completed initialization"

Sep 08 22:24:13 docker01 systemd[1]: Started Docker Application Container Engine.

Sep 08 22:24:13 docker01 dockerd[9398]: time="2021-09-08T22:24:13.641779103+08:00" level=info msg="API listen on /run/docker.sock"