OSGi Community Event 2015 This talk will review the current trends of Microservices and Containerisation and explain how, for the Java ecosystem, OSGi has already delivered this vision and addressed the manageability issues that Docker-based systems still face.</p> The importance of self-describing artifacts and dependency management will reviewed along with an explanation of how this is addressed in OSGi and Docker centric ecosystems. The talk will conclude with a demonstration showing how OSGi standards can be leveraged to build a compelling Container Orchestration and Runtime environment.

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Transforming the Way
the World Runs Applications
Copyright © 2012 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.
www.paremus.comParemus July 2012
Modularity, Microservices and Containerisation
info@paremus.com

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Copyright © 2009 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.
Paremus Service Fabric Overview November 2009
• Docker reigns supreme…
• Also:
• Rocket (CoreOS)
• Solaris Zones
• FreeBSD Jails
• etc
Containers

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Copyright © 2009 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.
Paremus Service Fabric Overview November 2009
• Reduce the pain of shipping apps to production.
• Kill off “It Works for Me” syndrome.
• Increased security.
What Containers are Claimed to Solve

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Copyright © 2009 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.
Paremus Service Fabric Overview November 2009
• Reduce the pain of shipping apps to production.
• Consistent way to ship and run applications.
• You already know how to run any image.
• Increased security.
• Hugely powerful for opaque, 3rd Party parts of your app:
• MySQL, ZooKeeper, Hadoop, …
What Containers Actually Solve

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Paremus Service Fabric Overview November 2009
• Configuration approaches vary widely.
• Dependencies still exist!
• OS kernel version, CPU, GPU
• Network
• Dependent Services
• Orchestration (solutions are nascent).
What Containers Don’t Solve

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Paremus Service Fabric Overview November 2009
• Modularity!
• Application code is untouched by containerisation.
• Greatest strength and greatest weakness.
• All too easy to build containerised monoliths.
• Just as hard to maintain, evolve.
What Containers Don’t Solve

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Copyright © 2009 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.
Paremus Service Fabric Overview November 2009
• “… an approach to developing a single application as a suite of small
services, each running in its own process and communicating with
lightweight mechanisms, often an HTTP resource API. These services are
built around business capabilities and independently deployable by fully
automated deployment machinery. There is a bare minimum of centralized
management of these services, which may be written in different
programming languages and use different data storage technologies.”
• From the Gospel of Martin Fowler ;-)
Microservices

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Paremus Service Fabric Overview November 2009
• Small services
• Own process
• Lightweight communications
• Independently deployable
• Automated deployment
• May be written in different languages
Microservices

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Paremus Service Fabric Overview November 2009
• Separate processes add overhead.
• Security risks: every service adds to attack surface.
• Sometimes worth it, sometimes not.
• This is an implementation choice.
• Should not be required by the architectural definition.
Microservices

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Paremus Service Fabric Overview November 2009
• OSGi is a great implementation tech for both of these patterns.
• First: Microservices
An OSGi Approach

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Paremus Service Fabric Overview November 2009
• OSGi Services == Microservices
• Lightweight communications, independently deployable, yada yada.
• Defer the decision to go remote.
• Service boundaries are hard to anticipate
• (From 11+ years OSGi development experience!)
OSGi Microservices

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Paremus Service Fabric Overview November 2009
Scale Out…
Consumer Provider
Consumer Provider

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Paremus Service Fabric Overview November 2009
Consumer Provider
… and Scale In
Consumer Provider

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Paremus Service Fabric Overview November 2009
• OSGi Remote Services Admin.
• Transparent discovery and distribution for OSGi Services.
• Better (but not limited to) OSGi at both ends.
Options
Provider

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Copyright © 2009 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.
Paremus Service Fabric Overview November 2009
• OSGi Remote Services Admin.
• Transparent discovery and distribution for OSGi Services.
• Better (but not limited to) OSGi at both ends.
Options
ProviderConsumer

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Copyright © 2009 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.
Paremus Service Fabric Overview November 2009
• REST.
• Layered over OSGi Services (whiteboard).
• RFP-173: JAX-RS Services — OSGi Enterprise R7 (hopefully).
• Interim: hstaudacher/osgi-jax-rs-connector works well*.
Options
* But careful of CDDL/GPL on Jersey.

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Copyright © 2009 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.
Paremus Service Fabric Overview November 2009
• Begin your microservices application in OSGi.
• Just write interfaces and components!
• As the need arises, separate into processes.
Summary

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Paremus Service Fabric Overview November 2009
• Second: Containers
An OSGi Approach

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Paremus Service Fabric Overview November 2009
• Containers are implementation agnostic.
• OSGi gives us internal modularity.
• Turtles all the way down.
• Reuse APIs and component from your Repository.
• Use the Resolver to assemble container content, minimise image size.
• Bndtools 3.1+ may support “export as Docker image”.
• Easy deployment for Ops people familiar with Docker.
OSGi Inside

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Paremus Service Fabric Overview November 2009
• Paremus Packager — announced at EclipseCon, Boston 2013.
• Integrates lifecycle of external apps into OSGi.
• Originally used custom process launcher.
• Rewritten early this year to support Docker.
• (non-Dockerised processes still supported).
• Bundles can depend on containerised services.
• Resolver can solve and provision these dependencies.
OSGi Outside

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Paremus Service Fabric Overview November 2009
OSGi Outside
Consumer
Require-Capability:
com.paremus.packager.pkg.MySQL Endpoint
resolve
Paremus Service Fabric

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Copyright © 2009 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.
Paremus Service Fabric Overview November 2009
Consumer
Require-Capability:
com.paremus.packager.pkg.MySQL
MySQL
Package
Wrapper
Provide-Capability:
com.paremus.packager.pkg.MySQL
resolve provision
Paremus Service Fabric
Endpoint
Start or Attach
Container
OSGi Outside

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Copyright © 2009 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.
Paremus Service Fabric Overview November 2009
Consumer
Require-Capability:
com.paremus.packager.pkg.MySQL
MySQL
Package
Wrapper
Provide-Capability:
com.paremus.packager.pkg.MySQL
resolve provision
Paremus Service Fabric
Endpoint;
uri=jdbc:mysql://192.168.0.1:3306
Start or Attach
Container
OSGi Outside

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Paremus Service Fabric Overview November 2009
• Temporal Dependencies
• Packager knows when the container is running and available.
• Publishes the URL of that service to the distributed app:
• e.g.: jdbc:mysql://192.168.0.20:3306
• Using OSGi Remote Services (yay standards)
• Injectable by any OSGi component.
• Including other Packager wrappers!
OSGi Outside

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Copyright © 2009 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.
Paremus Service Fabric Overview November 2009
WordPress
Require-Capability:
com.paremus.packager.pkg.MySQL
MySQL
Package
Wrapper
Provide-Capability:
com.paremus.packager.pkg.MySQL
resolve provision
Paremus Service Fabric
Endpoint;
uri=jdbc:mysql://192.168.0.1:3306
Endpoint;
uri=http://192.168.0.20:80;
app=WordPress 4.1
OSGi Outside

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Paremus Service Fabric Overview November 2009
OSGi Outside
DEMO

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Copyright © 2009 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.
Paremus Service Fabric Overview November 2009
Packager
Paremus Packager and Demos at docs.paremus.com