Linux配置免密登陆

A机器免密登陆B机器

[root@ServerA ~]# ssh-copy-id ServerB
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
root@ServerB's password: 

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'ServerB'"
and check to make sure that only the key(s) you wanted were added.

如果不生效的话，检查一下B机器ssh目录和文件的权限

//.ssh文件夹权限
chmod 700 ~/.ssh/

//authorized_keys 文件权限
chmod 600 ~/.ssh/authorized_keys

检测/etc/ssh/sshd_config的配置

AuthorizedKeysFile	.ssh/authorized_keys
PubkeyAuthentication yes