SSH免密码

主节点上生成密钥对，分发到各个节点上去

• 在主节点上执行ssh-keygen -t rsa一路回车，生成无密码的密钥对。
  ssh-keygen -t rsa
• 将公钥添加到认证文件中
  cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
• 设置authorized_keys的访问权限
  chmod 600 ~/.ssh/authorized_keys
• scp文件到所有datenode节点
  scp ~/.ssh/authorized_keys root@node1:~/.ssh/
scp ~/.ssh/authorized_keys root@node2:~/.ssh/
scp ~/.ssh/authorized_keys root@noden:~/.ssh/
• 监测
  ssh node1
ssh node2
ssh noden

另外一种方式
ssh-keygen -t rsa -C "zk2"
ssh-copy-id root@zk1

http://blog.csdn.net/u013066244/article/details/52796341

其它方式

ssh-keygen -t rsa -f ~/.ssh/id_rsa -P '' && \ cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

vi ~/.ssh/config

Host localhost
  StrictHostKeyChecking no

Host 0.0.0.0
  StrictHostKeyChecking no
  
Host ourdark*
   StrictHostKeyChecking no
   UserKnownHostsFile=/dev/null