docker 安装（unbuntu安装）

替换源

有时候因为墙的原因，总是不成功，因此我们直接将apt源换成阿里云的
阿里云ubuntu镜像源
需要在阿里云找到指定版本的源，我这里是Ubuntu20

sudo vim /etc/apt/sources.list
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更换内容（可以先将sources.list备份）

deb https://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
deb-src https://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse

deb https://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
deb-src https://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse

deb https://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
deb-src https://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse

# deb https://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse
# deb-src https://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse

deb https://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
deb-src https://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse

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更新

sudo apt-get -y update
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docker安装

也会碰到墙的问题，因此也直接用阿里云的源,
阿里云docker-ce安装

step 1: 安装必要的一些系统工具

sudo apt-get update
sudo apt-get -y install apt-transport-https ca-certificates curl software-properties-common
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step 2: 安装GPG证书

curl -fsSL https://mirrors.aliyun.com/docker-ce/linux/ubuntu/gpg | sudo apt-key add -
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Step 3: 写入软件源信息

sudo add-apt-repository "deb [arch=amd64] https://mirrors.aliyun.com/docker-ce/linux/ubuntu $(lsb_release -cs) stable"
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Step 4: 更新并安装Docker

sudo apt-get -y update
sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
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测试

sudo docker run hello-world
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