问题一：Host key verification failed.lost connection解决方法
vim /etc/ssh/ssh_config
StrictHostKeyChecking no
UserKnownHostsFile /dev/null问题二：Warning: Permanently added ‘bigdata2,192.168.239.132’ (ECDSA) to the list of known hosts.service sshd restart
ssh -q -o 'StrictHostKeyChecking no' -o 'UserKnownHostsFile /dev/null' root@192.168.239.132
