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From CodeCola <prasen...@rogers.com>
Subject Re: Levels of Containerization - focus on Docker and Karaf
Date Thu, 12 Jan 2017 17:01:09 GMT
Thanks for a great discussion especially the insights from real world
deployments. This is what I understand:

*"Static" Karaf Profiles*

Docker images should be based on a "static distribution" of Karaf generated
from Profiles. Starting from Profiles, one can generate a docker image and
push it to a registry.  The image would contain all the needed bundles and
would not have to be further "provisioned".  This resembles the "static
container" idea which is the basis for Docker application packaging.

In principle, you want to have the following steps:
•	Create a Karaf feature from your application 
•	Assemble it to a kar file (a custom Karaf distribution)
•	Deploy the new Karaf package to Docker

fabric8 has a maven-plugin for doing this which is well documented.


Can be done by using the karaf maven plugin and configuring startupFeatures
and referencing the static kar, as shown in:

Karaf section about custom assembly builds

*Naming and Packaging*
Docker will likely influence how you package and provision your Karaf
distributions. For instance, you will eventually have to provide a Docker
image with a pre-configured Karaf, KAR files in deployment folder, etc. so
that your Kubernetes container may bootstrap everything on boot.
Cellar Kubernetes discovery service is a great complement to the Karaf
docker.io feature (allowing you to easily create and manage docker.io images
in and for Karaf). To install the Kubernetes discovery service, simply
install cellar-kubernetes feature.
	karaf@root()> feature:install cellar-kubernetes

Question -* What is Karaf Boot?*
Could only find: https://github.com/jbonofre/karaf-boot

There isn't enough documentation!

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