[FLINK-24474] set default for taskmanager.host

flink-dist/src/main/resources/flink-conf.yaml

@@ -51,14 +51,26 @@ jobmanager.bind-host: localhost
 
 jobmanager.memory.process.size: 1600m
 
-# The host interface the TaskManager will bind to. My default, this is localhost, and will prevent
+# The host interface the TaskManager will bind to. By default, this is localhost, and will prevent
 # the TaskManager from communicating outside the machine/container it is running on.
 #
 # To enable this, set the bind-host address to one that has access to an outside facing network
 # interface, such as 0.0.0.0.
 
 taskmanager.bind-host: localhost
 
+# The address of the host on which the TaskManager runs and can be reached by the JobManager and
+# other TaskManagers. If not specified, the TaskManager will try different strategies to identify
+# the address.
+#
+# Note this address needs to be reachable by the JobManager and forward traffic to one of
+# the interfaces the TaskManager is bound to (see 'taskmanager.bind-host').
+#
+# Note also that unless all TaskManagers are running on the same machine, this address needs to be
+# configured separately for each TaskManager.
+
+taskmanager.host: localhost
+
 # The total process memory size for the TaskManager.
 #
 # Note this accounts for all memory usage within the TaskManager process, including JVM metaspace and other overhead.

flink-end-to-end-tests/flink-end-to-end-tests-common/src/main/java/org/apache/flink/tests/util/flink/container/FlinkContainersBuilder.java

@@ -167,6 +167,7 @@ public FlinkContainers build() {
 
  this.conf.set(JobManagerOptions.BIND_HOST, "0.0.0.0");
  this.conf.set(TaskManagerOptions.BIND_HOST, "0.0.0.0");
+ this.conf.removeConfig(TaskManagerOptions.HOST);
 
  // Create temporary directory for building Flink image
  final Path imageBuildingTempDir;

flink-kubernetes/src/main/java/org/apache/flink/kubernetes/kubeclient/decorators/FlinkConfMountDecorator.java

@@ -162,6 +162,7 @@ private Map<String, String> getClusterSidePropertiesMap(Configuration flinkConfi
  clusterSideConfig.removeConfig(RestOptions.BIND_ADDRESS);
  clusterSideConfig.removeConfig(JobManagerOptions.BIND_HOST);
  clusterSideConfig.removeConfig(TaskManagerOptions.BIND_HOST);
+ clusterSideConfig.removeConfig(TaskManagerOptions.HOST);
  return clusterSideConfig.toMap();
  }
 

flink-yarn/src/main/java/org/apache/flink/yarn/entrypoint/YarnEntrypointUtils.java

@@ -67,6 +67,7 @@ public static Configuration loadConfiguration(
  configuration.setString(JobManagerOptions.ADDRESS, hostname);
  configuration.removeConfig(JobManagerOptions.BIND_HOST);
  configuration.removeConfig(TaskManagerOptions.BIND_HOST);
+ configuration.removeConfig(TaskManagerOptions.HOST);
  configuration.setString(RestOptions.ADDRESS, hostname);
  configuration.setString(RestOptions.BIND_ADDRESS, hostname);