Overview of Project Structure

Overview

The bootup process

The entrypoint /etc/confluent/docker/run runs three executable in the /etc/confluent/docker in the following sequence:

/etc/confluent/docker/configure

/etc/confluent/docker/ensure

/etc/confluent/docker/launch

###Configuration

The configure script does all the configuration. This includes :

• Creating all configuration files and copying them to their proper location
• It is also responsible for handling service discovery if required.

###Preflight checks The ensure scripts makes sure that all the prerequisites for launching the service are in place. This includes:

• Ensure the configuration files are present and readable.
• Ensure that you can write/read to the data directory. The directories need to be world writable.
• Ensuring supporting services are in READY state. For example, ensure that ZK is ready before launching Kafka broker.
• Ensure supporting systems are configured properly. For example, make sure all topics required for C3 are created with proper replication, security and partition settings.

###Launching the process

The launch script runs the actual process. The script should ensure that :

• The process is run properly. You need to do exec (Note to self: Why was this needed again?)
• Log to stdout

Guidelines for the scripts

• Make it executable
• Fail fast
• Fail with good error messages
• Return 0 if success, 1 if fail