This slide deck explains about Cloud modernisation of legacy application.

1. By Chamin Wickramarathna
Associate Software Architect
CLOUDLIFTING LEGACY APPLICATIONS:
A ROADMAP TO MODERNIZATION

2. Good evening everyone!
I'm Chamin Wickramarathna,
a seasoned software/solution architect at Insighture
with expertise in Fullstack Engineering, Cloud Computing,
and Performance Engineering.
https://www.linkedin.com/in/chaminw/

3. ● Introduction
● Legacy Application Challenges
● Case Study: Problem
● Benefits of Cloud Modernization
● Modernization Roadmap
● Modernization Approaches
● Tools and Technologies
● Best Practices
● CI/CD in Modernization
● Monitoring and Optimization
● Case Study: Solution
● Conclusion
● Q & A
Agenda

4. LEGACY APPLICATIONS

5. Legacy Application Challenges
Legacy applications, often built on outdated technology stacks,
come with set of challenges.
○ Obsolete Technology: Running on outdated frameworks and
languages.
○ Scalability Limitations: Difficulty in handling increased
workloads.
○ Maintenance Overhead: High costs and time-consuming
maintenance.
○ Security Risks: Pose security risks in today's threat landscape.
○ Limited Agility: Challenging to adapt to changing business
needs.
○ Integration Complexity: Difficulty in integrating with modern
systems.

6. Case Study: Legacy System

7. MODERNIZATION

8. Modernization through cloud adoption offers numerous
advantages:
○ Scalability: The ability to easily scale resources up or
down to meet changing demands.
○ Cost-Efficiency: Reduced infrastructure and
maintenance costs compared to on-premises solutions.
○ Agility: Faster development and deployment cycles,
enabling quicker responses to market changes.
○ Security and Resilience: Secure from ever-evolving
security threats
○ Integration: Straightforward integration with other
software and third-party tools.
Embracing the cloud is a strategic move for staying
competitive.
Benefits of Cloud Modernization

9. 1. Define the business case for modernization.
2. Assess and define limitations of the legacy system.
3. Identify and prioritize areas for improvement.
4. Set clear goals and choose the right modernization approaches.
5. Develop a modernization plan.
6. Select appropriate technology stack.
7. Develop changes.
8. Perform application testing and validation.
9. Deploy the modernized version.
10. Evaluate and adjust the strategy as needed.
Cloud Modernization Roadmap

10. When it comes to modernizing legacy applications, we have several approaches
at our disposal:
○ Encapsulation: Data and functions are boxed together to provide access to
them as services through an API.
○ Rehost/Lift and Shift: Migrating applications as-is to the cloud for greater
scalability and performance.
○ Replatform: Make necessary adjustments to leverage cloud features.
○ Refactor: Restructuring and optimizing code for the cloud environment.
○ Rearchitect: Redesigning applications for cloud-native architecture.
○ Rewrite/Rebuild: Rewriting components from scratch without changing their
scope and specifications.
○ Replace: Replacing existing system/components with new/existing ones.
○ Strangler Pattern: Gradual replacement of legacy components with modern
ones.
Modernization Approaches

11. • The choice of approach depends on factors like the application's current
state and long-term goals.
• Choose modernization approaches with the highest effect and value while
considering cost, risk and impact.
Choosing Modernization Approach

12. Tools and Technologies
To succeed in modernization, we need the right tools and
technologies:
○ Cloud Providers: AWS, Azure, GCP, Oracal,
IBM, etc.
○ Containerization: Docker, Kubernetes, etc
○ Microservices
○ APIs: RESTful, GraphQL, gRPC, etc.
○ DevOps: CICD, Jenkins, Jenkins, Ansible, Git, etc.
https://www.cloverinfotech.com/
https://www.netsolutions.com/

13. To ensure a smooth modernization journey, we should follow these best practices:
○ Prioritize Apps/Components for Modernization: Finalize the list of apps for
modernizing based on priority.
○ Thorough Planning and Documentation: A well-thought-out plan and proper
documentation are crucial.
○ User Experience Consideration: Prioritize user experience during the cloud
migration process.
○ Dependency Evaluation: Carefully evaluate legacy apps and their
dependencies before migration.
○ Set Smaller Modernization Goals: Taking small steps will always be helpful in
understanding what is working in favor and what is not.
○ Security and Compliance: Prioritize security and regulatory compliance
throughout the process.
○ Continuous Monitoring and Optimization: Regularly monitor and optimize to
maintain performance and cost efficiency.
○ Parallel Operation: Run existing systems in parallel until cloud-migrated apps
function accurately and consistently.
Best Practices

14. Continuous Integration and Continuous Deployment (CI/CD) play a pivotal role in
modernization:
○ Streamlined Development and Testing: Accelerate development cycles by
automating testing and integration.
○ Automated Deployment: Ensure consistent and automated deployment to reduce
errors and downtime.
○ Reduced Deployment Risk: Minimize deployment risks with easy rollbacks.
○ Faster Time to Market: Shorten release cycles, respond quickly to market
changes, and deliver updates faster.
○ Improved Collaboration: Foster collaboration between development and
operations teams.
○ Enhanced Quality and Stability: Maintain high software quality through
automated testing and real-time monitoring.
○ Infrastructure as Code (IaC): Treat infrastructure configuration as code for
consistency and automation.
CI/CD in Modernization

15. Ongoing monitoring and optimization are key to maintaining a modernized
application's health:
○ Monitoring Tools: Utilize monitoring tools to gain real-time insights, security,
performance tracking and proactive issue detection.
○ Cost and Resource Optimization: Implement strategies to optimize costs and
resource utilization.
○ Security Vigilance: Continuously detect threats, respond rapidly, and
maintain compliance.
○ Performance Tuning: Optimize speed, review code and configurations, and
refine resource allocation.
Monitoring and Optimization

16. Case Study: Legacy System

17. Case Study: Modernized System

18. CONCLUSION

19. Achieve Success: Successful cloud modernization boosts performance, cuts costs, and
ensures scalability.
Empower Your Team: Foster collaboration, training, and knowledge sharing to drive
innovation.
Stay Agile in a Changing World: Recognize that even the "new" will become "legacy"
eventually. Stay adaptable and agile in evolving tech landscapes and changing business
needs.
Embrace the Journey of Continuous Improvement: Modernization isn't an overnight task,
it's a continuous journey of growth, adaptation, and excellence.
Conclusion

20. Q & A

21. Thank you