启动spark localhost: ssh: Could not resolve hostname localhost: Name or service not known

可查看hosts文件

root@ubuntu:/home/xiaoye/zookeeper# vim /etc/hosts
#127.0.0.1      localhost
#127.0.1.1      ubuntu
192.168.26.140  ubuntu
192.168.26.141  ubuntu2
192.168.26.142  ubuntu3

看到localhost被注销掉了，那就试着把他放开：

root@ubuntu:/home/xiaoye/zookeeper# vim /etc/hosts
127.0.0.1       localhost
127.0.1.1       ubuntu
192.168.26.140  ubuntu
192.168.26.141  ubuntu2
192.168.26.142  ubuntu3

然后重新启动spark，就行了。

如果是个集群就全部都放开；