SSH 免密码登录配置

ssh-keygen -t rsa
cd .ssh/
cp id_rsa.pub authorized_keys
vi authorized_keys
添加别的节点pub。

SCP命令安装
yum install openssh-clients

复制文件到别的节点
scp authorized_keys root@node1:~/.ssh/
scp authorized_keys root@node2:~/.ssh/
chmod 700 ~/
chmod 600 ~/.ssh/authorized_keys

ssh node1
ssh node2
ssh node3