SSH配置与修改
必须的要求：SSH doesn’t like it if your home or ~/.ssh directories have group write permissions. Your home directory should be writable only by you, ~/.ssh should be 700, and authorized_keys should be 600.
You can also get around this by adding StrictModes off to your ssh_config file, but I’d advise against it - fixing permissions is the way to go.
即有几处是需要处理（注意）的：
1、用户家目录组用户权限不能有写（W）权限，如/home/oper目录，可以是755.
2、~/.ssh 目录权限应该是700，~/.ssh/authorized_keys 文件权限应该是600.
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