集群 SSH 免密登陆

master/slave1/slave2/slave3
//所有机器执行
ssh-keygen -t rsa

cd ~/.ssh
cat id_rsa.pub >> authorized_keys
scp authorized_keys nexthost:~/.ssh

ssh nexthost

master# cat id_rsa.pub >> authorized_keys
master# chmod 600 authorized_keys
master# scp authorized_keys slave1:~/.ssh/

slave1# cat id_rsa.pub >> authorized_keys
slave1# scp authorized_keys slave2:~/.ssh/

slave2# cat id_rsa.pub >> authorized_keys
slave2# scp authorized_keys slave3:~/.ssh/

slave3# cat id_rsa.pub >> authorized_keys
slave3# scp authorized_keys master:~/.ssh/
slave3# scp authorized_keys slave1:~/.ssh/
slave3# scp authorized_keys slave2:~/.ssh/