见了个鬼，今天开虚拟机，启动Hadoop集群报错— master: ssh: connect to host master port 22: Connection refused 网上说啥突然关机，断电造成的，我昨晚关机前用stop-all.sh，好像没有jps看进程，命令执行完我就poweroff了，莫非这个问题,你这Hadoop关个集群这么慢吗— 或者centos 6系统bug, 然后想的启动服务结果Starting sshd: /var/empty/sshd must be owned by root and not group or world-writable. [FAILED]
chown -R root.root /var/empty/sshd chmod 755 /var/empty/sshd service sshd restart然后就启动成功了， 但是这还是成功了， spark任务做完再重新做ssh免密登录，—哈哈！
