SSH免密登陆

# 每个节点都执行
ssh-keygen -t rsa # 一路回车
# 将公钥添加到认证文件中
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
# 并设置authorized_keys的访问权限
chmod 600 ~/.ssh/authorized_keys

# 只要在一个节点执行即可
ssh db02 cat ~/.ssh/id_rsa.pub >>~/.ssh/authorized_keys
ssh db03 cat ~/.ssh/id_rsa.pub >>~/.ssh/authorized_keys

# 分发整合后的文件到其它节点
scp ~/.ssh/authorized_keys db02:~/.ssh/
scp ~/.ssh/authorized_keys db03:~/.ssh/

# 各节点执行
ssh db01 date
ssh db02 date
ssh db03 date

# 或者
ssh-copy-id root@172.16.0.164