Create base-image and minimize layer count (#324)

* Create base-image and minimize layer count

* Create running-on-kubernetes.md

docs/running-on-kubernetes.md

@@ -49,20 +49,24 @@ If you wish to use pre-built docker images, you may use the images published in
 </table>
 
 You may also build these docker images from sources, or customize them as required. Spark distributions include the
-Docker files for the driver, executor, and init-container at `dockerfiles/driver/Dockerfile`,
+Docker files for the base-image, driver, executor, and init-container at `dockerfiles/spark-base/Dockerfile`, `dockerfiles/driver/Dockerfile`,
 `dockerfiles/executor/Dockerfile`, and `dockerfiles/init-container/Dockerfile` respectively. Use these Docker files to
 build the Docker images, and then tag them with the registry that the images should be sent to. Finally, push the images
 to the registry.
 
 For example, if the registry host is `registry-host` and the registry is listening on port 5000:
 
     cd $SPARK_HOME
+    docker build -t registry-host:5000/spark-base:latest -f dockerfiles/driver/spark-base .
     docker build -t registry-host:5000/spark-driver:latest -f dockerfiles/driver/Dockerfile .
     docker build -t registry-host:5000/spark-executor:latest -f dockerfiles/executor/Dockerfile .
     docker build -t registry-host:5000/spark-init:latest -f dockerfiles/init-container/Dockerfile .
+    docker push registry-host:5000/spark-base:latest
     docker push registry-host:5000/spark-driver:latest
     docker push registry-host:5000/spark-executor:latest
     docker push registry-host:5000/spark-init:latest
+
+Note that `spark-base` is the base image for the other images.  It must be built first before the other images, and then afterwards the other images can be built in any order.
 
 ## Submitting Applications to Kubernetes
 

resource-managers/kubernetes/docker-minimal-bundle/src/main/docker/driver/Dockerfile

@@ -15,26 +15,13 @@
 # limitations under the License.
 #
 
-FROM openjdk:8-alpine
+FROM spark-base
 
 # 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-driver:latest -f dockerfiles/driver/Dockerfile .
 
-RUN apk upgrade --update
-RUN apk add --update bash tini
-RUN mkdir -p /opt/spark
-RUN touch /opt/spark/RELEASE
-
-ADD jars /opt/spark/jars
-ADD examples /opt/spark/examples
-ADD bin /opt/spark/bin
-ADD sbin /opt/spark/sbin
-ADD conf /opt/spark/conf
-
-ENV SPARK_HOME /opt/spark
-
-WORKDIR /opt/spark
+COPY examples /opt/spark/examples
 
 CMD SPARK_CLASSPATH="${SPARK_HOME}/jars/*" && \
     if ! [ -z ${SPARK_MOUNTED_CLASSPATH+x} ]; then SPARK_CLASSPATH="$SPARK_MOUNTED_CLASSPATH:$SPARK_CLASSPATH"; fi && \

resource-managers/kubernetes/docker-minimal-bundle/src/main/docker/executor/Dockerfile

@@ -15,26 +15,13 @@
 # limitations under the License.
 #
 
-FROM openjdk:8-alpine
+FROM spark-base
 
 # 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-executor:latest -f dockerfiles/executor/Dockerfile .
 
-RUN apk upgrade --update
-RUN apk add --update bash tini
-RUN mkdir -p /opt/spark
-RUN touch /opt/spark/RELEASE
-
-ADD jars /opt/spark/jars
-ADD examples /opt/spark/examples
-ADD bin /opt/spark/bin
-ADD sbin /opt/spark/sbin
-ADD conf /opt/spark/conf
-
-ENV SPARK_HOME /opt/spark
-
-WORKDIR /opt/spark
+COPY examples /opt/spark/examples
 
 # TODO support spark.executor.extraClassPath
 CMD SPARK_CLASSPATH="${SPARK_HOME}/jars/*" && \

resource-managers/kubernetes/docker-minimal-bundle/src/main/docker/init-container/Dockerfile

@@ -15,24 +15,10 @@
 # limitations under the License.
 #
 
-FROM openjdk:8-alpine
+FROM spark-base
 
 # 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-executor:latest -f dockerfiles/executor/Dockerfile .
 
-RUN apk upgrade --update
-RUN apk add --update bash tini
-RUN mkdir -p /opt/spark
-RUN touch /opt/spark/RELEASE
-
-ADD jars /opt/spark/jars
-ADD bin /opt/spark/bin
-ADD sbin /opt/spark/sbin
-ADD conf /opt/spark/conf
-
-ENV SPARK_HOME /opt/spark
-
-WORKDIR /opt/spark
-
 ENTRYPOINT [ "/sbin/tini", "--", "bin/spark-class", "org.apache.spark.deploy.rest.kubernetes.KubernetesSparkDependencyDownloadInitContainer" ]

resource-managers/kubernetes/docker-minimal-bundle/src/main/docker/resource-staging-server/Dockerfile

@@ -15,24 +15,10 @@
 # limitations under the License.
 #
 
-FROM openjdk:8-alpine
+FROM spark-base
 
 # 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-executor:latest -f dockerfiles/executor/Dockerfile .
 
-RUN apk upgrade --update
-RUN apk add --update bash tini
-RUN mkdir -p /opt/spark
-RUN touch /opt/spark/RELEASE
-
-ADD jars /opt/spark/jars
-ADD bin /opt/spark/bin
-ADD sbin /opt/spark/sbin
-ADD conf /opt/spark/conf
-
-ENV SPARK_HOME /opt/spark
-
-WORKDIR /opt/spark
-
 ENTRYPOINT [ "/sbin/tini", "--", "bin/spark-class", "org.apache.spark.deploy.rest.kubernetes.ResourceStagingServer" ]

resource-managers/kubernetes/docker-minimal-bundle/src/main/docker/shuffle-service/Dockerfile

@@ -15,25 +15,12 @@
 # limitations under the License.
 #
 
-FROM openjdk:8-alpine
+FROM spark-base
 
 # 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-shuffle:latest -f dockerfiles/shuffle/Dockerfile .
 
-RUN apk upgrade --update
-RUN apk add --update bash tini
-RUN mkdir -p /opt/spark
-RUN touch /opt/spark/RELEASE
-
-ADD jars /opt/spark/jars
-ADD examples /opt/spark/examples
-ADD bin /opt/spark/bin
-ADD sbin /opt/spark/sbin
-ADD conf /opt/spark/conf
-
-ENV SPARK_HOME /opt/spark
-
-WORKDIR /opt/spark
+COPY examples /opt/spark/examples
 
 ENTRYPOINT [ "/sbin/tini", "--", "bin/spark-class", "org.apache.spark.deploy.kubernetes.KubernetesExternalShuffleService", "1" ]

resource-managers/kubernetes/docker-minimal-bundle/src/main/docker/spark-base/Dockerfile

@@ -0,0 +1,35 @@
+# 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 && \
+    touch /opt/spark/RELEASE
+
+COPY jars /opt/spark/jars
+COPY bin /opt/spark/bin
+COPY sbin /opt/spark/sbin
+COPY conf /opt/spark/conf
+
+ENV SPARK_HOME /opt/spark
+
+WORKDIR /opt/spark

resource-managers/kubernetes/integration-tests/src/test/scala/org/apache/spark/deploy/kubernetes/integrationtest/docker/SparkDockerImageBuilder.scala

@@ -28,6 +28,7 @@ private[spark] class SparkDockerImageBuilder(private val dockerEnv: Map[String,
 
   private val DOCKER_BUILD_PATH = Paths.get("target", "docker")
   // Dockerfile paths must be relative to the build path.
+  private val BASE_DOCKER_FILE = "dockerfiles/spark-base/Dockerfile"
   private val DRIVER_DOCKER_FILE = "dockerfiles/driver/Dockerfile"
   private val EXECUTOR_DOCKER_FILE = "dockerfiles/executor/Dockerfile"
   private val SHUFFLE_SERVICE_DOCKER_FILE = "dockerfiles/shuffle-service/Dockerfile"
@@ -60,6 +61,7 @@ private[spark] class SparkDockerImageBuilder(private val dockerEnv: Map[String,
 
   def buildSparkDockerImages(): Unit = {
     Eventually.eventually(TIMEOUT, INTERVAL) { dockerClient.ping() }
+    buildImage("spark-base", BASE_DOCKER_FILE)
     buildImage("spark-driver", DRIVER_DOCKER_FILE)
     buildImage("spark-executor", EXECUTOR_DOCKER_FILE)
     buildImage("spark-shuffle", SHUFFLE_SERVICE_DOCKER_FILE)