Github user dawidwys commented on a diff in the pull request:
https://github.com/apache/flink/pull/6377#discussion_r204019505
--- Diff:
flink-end-to-end-tests/test-scripts/docker-hadoop-secure-cluster/Dockerfile ---
@@ -0,0 +1,159 @@
+################################################################################
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+################################################################################
+#
+# This image is modified version of Knappek/docker-hadoop-secure
+# * Knappek/docker-hadoop-secure
<https://github.com/Knappek/docker-hadoop-secure>
+#
+# With bits and pieces added from Lewuathe/docker-hadoop-cluster to extend
it to start a proper kerberized Hadoop cluster:
+# * Lewuathe/docker-hadoop-cluster
<https://github.com/Lewuathe/docker-hadoop-cluster>
+#
+# Author: Aljoscha Krettek
+# Date: 2018 May, 15
+#
+# Creates multi-node, kerberized Hadoop cluster on Docker
+
+FROM sequenceiq/pam:ubuntu-14.04
+MAINTAINER aljoscha
+
+USER root
--- End diff --
I think commands in Dockerfile are by default executed as root. So this
command is unnecessary.
---
