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.