Github user pvillard31 commented on a diff in the pull request:
https://github.com/apache/nifi/pull/2839#discussion_r200042921
--- Diff: nifi-docker/docker-compose/README.md ---
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+
+# Apache NiFi Docker Compose
+
+# Usage
+
+## Overview
+The colocated docker-compose.yml is a [Docker
Compose](https://docs.docker.com/compose/overview/) definition providing an
easy way to start up an Apache NiFi Cluster.
+
+## NiFi version configuration
+There are two primary ways in which the cluster can be configured:
+
+ 1. By default, the Compose file (docker-compose.yml) is configured to
make use of the latest image that would be created by a NiFi Maven build with
the Docker profile activated through an invocation similar to `mvn clean
install -Pdocker`.
+ 2. Optionally, a user can update the docker-compose.yml file to use a
released convenience image provided in the [Apache NiFi Docker Hub
repository](https://hub.docker.com/r/apache/nifi/tags/). This is accomplished
by chainging the `image` property of the `nifi` service definition to be an
available Docker Hub tag such as `apache/nifi:1.7.0`. **NOTE** Changes to the
image can affect the expected conventions of the docker-compose.yml
configuration. All released images 1.7.0 or later should work with the file as
provided. If there are any issues, please file a
[JIRA](https://issues.apache.org/jira/browse/NIFI).
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