1. 通过ssh-keygen生成公钥和私钥

    如果已有，则可以跳过此步骤。

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    $ ssh-keygen -t rsa -b 4096 -C "l2m2 home mac"

    生成后，在~/.ssh/目录下将有以下文件

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    $ ls
    id_rsa  id_rsa.pub

  2. 通过ssh-copy-id拷贝公钥到远程主机

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    $ ssh-copy-id -i ~/.ssh/id_rsa.pub root@140.197.105.14

    过程中按照提示输入远程主机的密码

  3. 现在可以免密登录远程主机了。

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    $ ssh root@140.197.105.14
    Last login: Mon Jul  6 12:59:37 2020 from 118.112.72.21

    Welcome to Alibaba Cloud Elastic Compute Service !

    -bash: export: `=': not a valid identifier
    -bash: export: `/opt/node-v6.10.3-linux-x64': not a valid identifier
    -bash: export: `=': not a valid identifier
    -bash: export: `/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin': not a valid identifier
    [root@iZuf61ti9rpeooj054hbpgZ ~]#

Reference