[MINOR] Add instructions to build and upload Docker Demo images (#4612)

* [MINOR] Add instructions to build and upload Docker Demo images

* Add local test instruction

docker/README.md

@@ -0,0 +1,93 @@
+<!--
+* Licensed to the Apache Software Foundation (ASF) under one
+* or more contributor license agreements.  See the NOTICE file
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+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+-->
+
+# Docker Demo for Hudi
+
+This repo contains the docker demo resources for building docker demo images, set up the demo, and running Hudi in the
+docker demo environment.
+
+## Repo Organization
+
+### Configs for assembling docker images - `/hoodie`
+
+The `/hoodie` folder contains all the configs for assembling necessary docker images. The name and repository of each
+docker image, e.g., `apachehudi/hudi-hadoop_2.8.4-trinobase_368`, is defined in the maven configuration file `pom.xml`.
+
+### Docker compose config for the Demo - `/compose`
+
+The `/compose` folder contains the yaml file to compose the Docker environment for running Hudi Demo.
+
+### Resources and Sample Data for the Demo - `/demo`
+
+The `/demo` folder contains useful resources and sample data use for the Demo.
+
+## Build and Test Image locally
+
+To build all docker images locally, you can run the script:
+
+```shell
+./build_local_docker_images.sh
+```
+
+To build a single image target, you can run
+
+```shell
+mvn clean pre-integration-test -DskipTests -Ddocker.compose.skip=true -Ddocker.build.skip=false -pl :<image_target> -am
+# For example, to build hudi-hadoop-trinobase-docker
+mvn clean pre-integration-test -DskipTests -Ddocker.compose.skip=true -Ddocker.build.skip=false -pl :hudi-hadoop-trinobase-docker -am
+```
+
+Alternatively, you can use `docker` cli directly under `hoodie/hadoop`. Note that, you need to manually name your local
+image by using `-t` option to match the naming in the `pom.xml`, so that you can update the corresponding image
+repository in Docker Hub (detailed steps in the next section).
+
+```shell
+# Run under hoodie/hadoop, the <tag> is optional, "latest" by default
+docker build <image_folder_name> -t <hub-user>/<repo-name>[:<tag>]
+# For example, to build trinobase
+docker build trinobase -t apachehudi/hudi-hadoop_2.8.4-trinobase_368
+```
+
+After new images are built, you can run the following script to bring up docker demo with your local images:
+
+```shell
+./setup_demo.sh dev
+```
+
+## Upload Updated Image to Repository on Docker Hub
+
+Once you have built the updated image locally, you can push the corresponding this repository of the image to the Docker
+Hud registry designated by its name or tag:
+
+```shell
+docker push <hub-user>/<repo-name>:<tag>
+# For example
+docker push apachehudi/hudi-hadoop_2.8.4-trinobase_368
+```
+
+You can also easily push the image to the Docker Hub using Docker Desktop app: go to `Images`, search for the image by
+the name, and then click on the three dots and `Push to Hub`.
+
+![Push to Docker Hub](push_to_docker_hub.png)
+
+Note that you need to ask for permission to upload the Hudi Docker Demo images to the repositories.
+
+You can find more information on [Docker Hub Repositories Manual](https://docs.docker.com/docker-hub/repos/).
+
+## Docker Demo Setup
+
+Please refer to the [Docker Demo Docs page](https://hudi.apache.org/docs/docker_demo).

docker/setup_demo.sh

@@ -17,10 +17,14 @@
 # limitations under the License.
 
 SCRIPT_PATH=$(cd `dirname $0`; pwd)
+HUDI_DEMO_ENV=$1
 WS_ROOT=`dirname $SCRIPT_PATH`
 # restart cluster
 HUDI_WS=${WS_ROOT} docker-compose -f ${SCRIPT_PATH}/compose/docker-compose_hadoop284_hive233_spark244.yml down
-HUDI_WS=${WS_ROOT} docker-compose -f ${SCRIPT_PATH}/compose/docker-compose_hadoop284_hive233_spark244.yml pull
+if [ "$HUDI_DEMO_ENV" != "dev" ]; then
+  echo "Pulling docker demo images ..."
+  HUDI_WS=${WS_ROOT} docker-compose -f ${SCRIPT_PATH}/compose/docker-compose_hadoop284_hive233_spark244.yml pull
+fi
 sleep 5
 HUDI_WS=${WS_ROOT} docker-compose -f ${SCRIPT_PATH}/compose/docker-compose_hadoop284_hive233_spark244.yml up -d
 sleep 15