SSH免密登录CentOS7

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$ scp .ssh/id_rsa.pub user@ip:/root/id_rsa.pub

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$ cat id_rsa.pub >> .ssh/authorized_keys
$ chmod 700 .ssh
$ chmod 600 .ssh/authorized_keys

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$ vim /etc/ssh/sshd_config

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RSAAuthentication yes
PubkeyAuthentication yes
AuthorizedKeysFile .ssh/authorized_keys

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$ service ssh restart

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$ ssh user@ip

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Host xxx # 别名
Hostname xxx.xxx.xxx.xxx # ip
Port 22
User xxx # 用户名
IdentityFile ~/.ssh/id_rsa

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$ ssh xxx