The document provides an overview of legacy application migration, discussing definitions, challenges, and strategies including re-hosting, re-platforming, and re-factoring. It highlights the importance of automation, experimentation, and specific tools such as Docker and Traefik in managing legacy applications on the Cloud Foundry platform. Key insights include the need for thoughtful application portfolio management and the advantages of leveraging modern platform capabilities.

1. Enterprise Application
Migration
and how NOT to royally make a mess...

2. High Level Overview
● Level Set: What does “Legacy Application” mean today?
● Background, what is the Grid Platform?
● Technical Challenges and how we overcame them.
● Next time around and what we’d do differently.
● Parting tech tips you can use with your Legacy apps

3. Mike Wright
Pivotal Platform Architect,
Manager - Southeast
Started coding Java in
1996 at Lucent
Technologies back when
PowerBuilder was more
popular!

4. Ashley Eckard
THD Senior System Engineer
Originally started as a
software engineer at a
startup company.
Chocolate...

5. What does “Legacy”
applications Mean?

7. What is The Grid
Platform?

9. Why Migrate Now?

11. Cloud Foundry can be more than Luke
Didja know?
- Run docker images
- Push SQLPlus client + SQL and run as task
- Container to container networking
- Volume mounts
- Windows
- JEE apps
- Side cars
- Istio/Envoy
- Push MySQL Router as an app to proxy InnoDB clusters

12. The 4 “Re’s” of Application Transformation
Re-Host
Containerize aka
“lift and shift”
Re-Platform
Minimal efforts to run
natively on PAS
Re-Factor
Convert to Cloud
Native aka
“Modernize”
Re-Build
Decompose and
rewrite from the
ground up
Application Portfolio
Funneling Process
Business and Technical filters, prioritization, scheduling, etc.
AppPlatform

13. How did you
approach the
Problem?

14. Did you make a Code Change?

15. How to change a tire while the vehicle is in motion

16. Dockerizing Grid
Config
Port to expose
App Name
RPMs - how Grid apps
are packaged today.
anyone do this?
Includes a packaged
mini version of our grid
environment!
Traefik - for specialized
app ingress handling.
wait, I thought this is a
k8s thing?
FluentBit - lots of
separate log files written
from Grid Apps. Popular
amongst K8s too!
Grid app!
Docker image to be deployed
onto AppPlatform!
Wizardly shell script

17. Grid App Running
Flow:
1. Pull in rpm’s and base image of mini grid
2. Generate Dockerfile
3. Cf push!
Less Common Platform features exploited
1. Enabling docker support
2. Search domains
3. Registry whitelisting
4. Container to Container
Java/Tomcat App
FluentBit
Log files
Traefik
Platform App Ingress
Kafka
Running Grid App
instance on AppPlatform
MySQL
Stdout Log
Platform log aggregation

18. Take Aways
● Knowing when the your thing is going to die.
● Take advantage of automation in the platform with legacy
applications.
● Experiment and play with your legacy applications, you’ll
be surprised how versatile your platform can be.

19. Probing Questions