Add Dockerfile for oap server.

docker/Makefile

+
+snapshot:
+	cd snapshot; \
+	cp ../../dist/apache-skywalking-apm-incubating.tar.gz ./ ; \
+	docker build -t skywalking/oap:latest .
+
+.PHONY: snapshot
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docker/README.md

+
+# Build snapshot image
+
+```shell
+make snapshot
+```
+
+# Run oap by docker-compose
+
+```shell
+docker-compose -f stack.yml up
+```
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docker/snapshot/Dockerfile

+FROM openjdk:8-jre-alpine
+
+ENV DIST_NAME=apache-skywalking-apm-incubating \
+    JAVA_OPTS=" -Xms256M -Xmx512M"
+
+# Install required packages
+RUN apk add --no-cache \
+    bash
+
+COPY "$DIST_NAME.tar.gz" /
+
+RUN set -ex; \
+    tar -xzf "$DIST_NAME.tar.gz"; \
+    rm -rf "$DIST_NAME.tar.gz"; rm -rf config/log4j2.xml;
+
+WORKDIR $DIST_NAME
+
+COPY log4j2.xml config/
+COPY docker-entrypoint.sh .
+
+EXPOSE 12800 11800
+
+ENTRYPOINT ["./docker-entrypoint.sh"]
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docker/snapshot/docker-entrypoint.sh

+#!/bin/bash
+
+set -e
+
+CLASSPATH="config:$CLASSPATH"
+for i in oap-libs/*.jar
+do
+    CLASSPATH="$i:$CLASSPATH"
+done
+
+java ${JAVA_OPTS} -classpath $CLASSPATH \
+ -Dstorage.elasticsearch.clusterNodes=elasticsearch:9200 \
+ org.apache.skywalking.oap.server.starter.OAPServerStartUp

docker/snapshot/log4j2.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ 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.
+  ~
+  -->
+
+<Configuration status="INFO">
+    <Appenders>
+        <Console name="Console" target="SYSTEM_OUT">
+            <PatternLayout charset="UTF-8" pattern="%d - %c -%-4r [%t] %-5p %x - %m%n"/>
+        </Console>
+    </Appenders>
+    <Loggers>
+        <logger name="org.eclipse.jetty" level="INFO"/>
+        <logger name="org.apache.zookeeper" level="INFO"/>
+        <logger name="org.elasticsearch.common.network.IfConfig" level="INFO"/>
+        <logger name="io.grpc.netty" level="INFO"/>
+        <logger name="org.apache.skywalking.oap.server.receiver.istio.telemetry" level="DEBUG"/>
+        <Root level="INFO">
+            <AppenderRef ref="Console"/>
+        </Root>
+    </Loggers>
+</Configuration>

docker/stack.yml

+version: '3.3'
+services:
+  elasticsearch:
+    image: docker.elastic.co/elasticsearch/elasticsearch:6.3.2
+    container_name: elasticsearch
+    restart: always
+    ports:
+      - 9200:9200
+      - 9300:9300
+    environment:
+      discovery.type: single-node
+  oap:
+    image: skywalking/oap
+    container_name: oap
+    depends_on:
+      - elasticsearch
+    links:
+      - elasticsearch
+    restart: always
+    ports:
+      - 11800:11800
+      - 12800:12800
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