Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/19717#discussion_r153414260
--- Diff:
resource-managers/kubernetes/docker/src/main/dockerfiles/spark-base/Dockerfile
---
@@ -0,0 +1,43 @@
+#
+# 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.
+#
+
+FROM openjdk:8-alpine
+
+# If this docker file is being used in the context of building your images
from a Spark distribution, the docker build
+# command should be invoked from the top level directory of the Spark
distribution. E.g.:
+# docker build -t spark-base:latest -f dockerfiles/spark-base/Dockerfile .
+
+RUN apk upgrade --no-cache && \
+ apk add --no-cache bash tini && \
+ mkdir -p /opt/spark && \
+ mkdir -p /opt/spark/work-dir \
+ touch /opt/spark/RELEASE && \
+ rm /bin/sh && \
+ ln -sv /bin/bash /bin/sh && \
+ chgrp root /etc/passwd && chmod ug+rw /etc/passwd
+
+COPY jars /opt/spark/jars
+COPY bin /opt/spark/bin
+COPY sbin /opt/spark/sbin
+COPY conf /opt/spark/conf
+COPY dockerfiles/spark-base/entrypoint.sh /opt/
+
+ENV SPARK_HOME /opt/spark
+
+WORKDIR /opt/spark/work-dir
+
+ENTRYPOINT [ "/opt/entrypoint.sh" ]
--- End diff --
nit: ditto.
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