开启rhel操作系统root权限的登陆（默认只允许cloud-user登陆的情况）

编辑这个文件：

/etc/ssh/sshd_config

# Change to no to disable s/key passwords
#ChallengeResponseAuthentication yes
ChallengeResponseAuthentication no

# Change to no to disable s/key passwords

#ChallengeResponseAuthentication yes

ChallengeResponseAuthentication no

修改为：

# Change to no to disable s/key passwords
ChallengeResponseAuthentication yes
#ChallengeResponseAuthentication no

# Change to no to disable s/key passwords

ChallengeResponseAuthentication yes

#ChallengeResponseAuthentication no

然后编辑这个文件

vi /root/.ssh/authorized_keys

将里边的内容删除ssh-rsa前的所有内容

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