The first element what we need is a new command line application to start the s3 gateway.
1. A new project should be introduced: hadoop-ozone/s3-gateway
2. A new command line application (eg. org.apache.hadoop.ozone.s3.Gateway should be added with a simple main and start/stop method which just prints out a starting/stopping log message
3. hadoop-ozone/common/src/main/bin/ozone should be modified to manage the new service (eg. ozone s3g start, ozone s3g stop)
4. to make it easier to test a new docker-compose based test cluster should be added to the hadoop-dist/src/main/compose (the normal ./ozone could be copied but we need to add the new s3g component)