ubuntu 22.04 安装docker并配置清华站。如果你过去安装过 docker，先删掉:首先安装依赖:信任 Docker 的 GPG 公钥并添加仓库:最后安装:此时docker已安装成功，若docker pull mysql 拉取失败，可能要换源，参考见原文链接，配置多个镜像源。
Specifies the port to connect to on the remote host. Note that this option is written with a capital ‘P’， because -p is already reserved for preserving the times and modes of the file in rcp.
