单机启动spark-shell失败：localhost被改变导致的问题

启动spark-shell报错：

ERROR SparkContext: Error initializing SparkContext.
java.net.BindException: Can't assign requested address: Service 'sparkDriver' failed after 16 retries (on a random free port)! Consider explicitly setting the appropriate binding address for the service 'sparkDriver' (for example spark.driver.bindAddress for SparkDriver) to the correct binding address.

原来是host被改了：

不再是localhost

改回来就行：

 

参考：https://stackoverflow.com/questions/44914144/error-sparkcontext-error-initializing-sparkcontext-java-net-bindexception-can/44916827