Github user zsxwing commented on a diff in the pull request:

    https://github.com/apache/spark/pull/11490#discussion_r55082251
  
    --- Diff: core/src/main/scala/org/apache/spark/ui/WebUI.scala ---
    @@ -134,7 +134,8 @@ private[spark] abstract class WebUI(
       def bind() {
         assert(!serverInfo.isDefined, "Attempted to bind %s more than 
once!".format(className))
         try {
    -      serverInfo = Some(startJettyServer("0.0.0.0", port, sslOptions, 
handlers, conf, name))
    +      serverInfo = 
Some(startJettyServer(Option(conf.getenv("SPARK_LOCAL_IP"))
    --- End diff --
    
    nit: the format is weird. Maybe something like this?
    ```Scala
          val host = Option(conf.getenv("SPARK_LOCAL_IP")).getOrElse("0.0.0.0")
          serverInfo = Some(startJettyServer(host, port, sslOptions, handlers, 
conf, name))
    ```


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