用ssh登錄一個機器（換過ip地址）會出現如下錯誤
weiguohui@weiguohui1-virtual-machine:~/.ssh$ ssh 172.16.33.53
The authenticity of host '172.16.33.53 (172.16.33.53)' can't be established.
ECDSA key fingerprint is 28:17:f7:c3:58:54:fb:6e:dd:b9:61:61:c4:8a:45:0f.
Are you sure you want to continue connecting (yes/no)?
Host key verification failed.
導致我的secondenamenode 和datanode 無法啟動，最后通過查資料解決，是解決的方法為：
weiguohui@weiguohui1-virtual-machine:~/.ssh$ ssh -o StrictHostKeyChecking=no 172.16.33.53
然后再ssh 登錄就不會報錯了