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今天本机安装hadoop 时，遇到一个问题，配置 ssh 登录权限失败
xxx@yyy:/opt/hadoop$ ssh localhost ssh: connect to host localhost port 22:
Connection refused
百度搜索了好多文章都没能搞定，最后还是通过 bing 搜索（国际版） 搞定的，这里分享一下。
<>1 确认 OpenSSH server 是否安装
sudo apt list --installed | grep openssh-server
如果有如下返回结果，说明已经正常安装了 openssh-server
相反，如果没有返回结果，说明还没有安装，需要进行安装
sudo apt install openssh-server
回车后，按照提示操作即可。
安装后，可以再次使用如下命令进行确认：
sudo apt list --installed | grep openssh-server
<>2 核查 ssh service 状态
使用如下命令查看 ssh service 启动状态
sudo service ssh status # root
由下图可以看出，sshd 并未启动运行
<>3 启动 ssh service 服务
使用如下命令启动 sshd
sudo service ssh start
发现报错了，真是一步一坑。。。
无奈，又去 bing 国际版 进行搜索，你还别说，就是比百度好使，第一条返回就解决了我的问题。
执行如下命令即可（需使用 root 用户）
ssh-keygen -A
执行上述命令后，切换到 datawhale 用户，再启动 sshd 就可以了
此时再执行 ssh localhost 命令就没问题了，问题解决。
