Docker安装

官方文档：https://docs.docker.com/engine/install/ubuntu/

1. 安装新版本前需要卸载旧版本。

   sudo apt-get remove docker docker-engine docker.io containerd runc

2. 允许apt使用https。

    sudo apt-get update
    sudo apt-get install \
       apt-transport-https \
       ca-certificates \
       curl \
       gnupg \
       lsb-release

3. 导入GPG密钥。

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

4. 添加docker源。

   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

5. 更新apt源，并安装docker。

    sudo apt-get update
    sudo apt-get install docker-ce docker-ce-cli containerd.io

6. （可选）使用阿里云的容器镜像服务-镜像加速器提升获取Docker官方镜像的速度。

https://cr.console.aliyun.com/cn-hangzhou/instances/mirrors

通过修改daemon配置文件/etc/docker/daemon.json来使用加速器

sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF'
{
  "registry-mirrors": ["https://每个人的阿里云账号不同.mirror.aliyuncs.com"]
}
EOF
sudo systemctl daemon-reload
sudo systemctl restart docker

1. 运行docker的hello-world

   sudo docker run hello-world

Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
b8dfde127a29: Pull complete 
Digest: sha256:df5f5184104426b65967e016ff2ac0bfcd44ad7899ca3bbcf8e44e4461491a9e
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/