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Containers aren’t just for microservices – Containerizing Legacy Workloads

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Slides for the presentation that I gave at DockerCon 2017 in Austin. The slot was rather short (20 minutes) and there wasn't a whole lot of time to dive into details, but I try to describe the main IT/business drivers that we've observed around container migration, our methodology for doing migrations in a structured manner, and then dive into some very practical topics based on existing migration exprience with Docker Datacenter Enteprise Edition.

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Containers aren’t just for microservices – Containerizing Legacy Workloads

  1. 1. Containers aren’t just for microservices – Containerizing Legacy Workloads
  2. 2. Oscar Renalias Senior Technology Architect @oscarrenalias github.com/oscarrenalias github.com/Accenture oscar.renalias@accenture.com
  3. 3. Driven by business needs for higher speed, flexibility and infrastructure cost reductions, enterprises are turning towards container-based infrastructures to support their wide variety of workloads DRIVERS • Speed • Agility • Flexibility • Cost • Scale • Resiliency ENABLERS Cloud DevOps CONTAINERS MODERN APP ARCHITECTURES LEGACY WORKLOADS
  4. 4. Why containers – IT Value Benefit Container Benefits Infrastructure DevOps Architecture License savings Hardware savings Flexible platforms Predictability Flexible application environments Efficiency Modern architectures Developer Productivity $$$ ⭐ ⭐ $$$ $ $$ $$$ ⭐ ⭐ ⭐ ⭐
  5. 5. Why containers – Business Value SPEED TO MARKET Allow business organizations to rapidly get their applications to mark JOURNEY TO CLOUD Accelerate the journey to cloud, using containers COMPLIANCE Control the entire software lifecycle; assess what runs where, by whom, what is packaged inside a container and apply policies to control runtime access
  6. 6. Legacy workload migration in the real world
  7. 7. Cloud Container Migration in the real world Run all platforms, legacy or otherwise, on the same robust and scalable platform, and increase/decrease capacity as needed, e.g. to create more development or testing environments when needed FLEXIBILITY 35-50% cost reduction on infrastructure and software licenses expected to be realized after completing the migration COST REDUCTION Integrate containerized applications with the client’s DevOps tooling, and enable capabilities such as deployment automation that would not have been possible earlier MODERNIZED APP LIFECYCLE
  8. 8. Docker EE Architecture Docker Datacenter CaaS Infrastructure Runtime Services Administration Host OS Container OS Container Engine Container Tooling Orchestration Resource Management Service Discovery PersistenceNetworking Browser Application Integrations Containers Data Registry Storage (Images) Monitoring DevOps Logging Image Build Access Control Log aggregation Metrics aggregation Monitoring, alerting SLA reporting and monitoring Secrets Management Docker Compose UCP, Swarm Overlays, HRM Sysdig Docker Overlays Convoy DTR S3 Docker Docker CLI RHEL RHEL Jenkins Docker EE ELK Sysdig Sysdig OOTB Docker EE Components Additional components Docker EE Storage (Volumes) EFS
  9. 9. Container Landscape Docker Datacenter CaaS Legacy Workloads • 15000 images in DTR • 150-200 containers on a regular basis • 50 nodes across prod and non-prod clusters • Application teams from Accenture as well as client partners • Every team with its own organization in DTR Microservices & APIs
  10. 10. Structured container migration QUALIFICATION ESTIMATION IMPLEMENTATION
  11. 11. Lessons learned
  12. 12. Stakeholder buy-in • Strong project management is necessary to coordinate all the different activities around validation and roll-out of containerized applications • Application teams and owners will be required to support • The more legacy the application, the more support it will require
  13. 13. Approach Containerizing by “sucking in” a bunch of folders and dumping them into a containe image is feasible, but not sustainable
  14. 14. Application Impact The approach to non-functional requirements are applied differently in a containerized environment – it impacts the way applications are containerized • High availability – let UCP handle it • Scalability – run more container instances in parallel
  15. 15. Roadmap and evolution Docker is evolving very fast – too fast, or not fast enough for your needs?
  16. 16. Networking, Routing and Discovery • Overlay networks are sufficient to support routing and discovery within the cluster. • Outside the cluster: Layer 7 routing is straightforward with HRM Layer 4 routing (e.g. JMS, RMI) is a bit more complicated
  17. 17. Persistence? What persistence? (some distributed filesystem) (storage plugin) Docker (storage plugin) Docker (storage plugin) Docker
  18. 18. Cluster Upgrades Upgrades to DTR and UCP must be approached carefully, and can still go wrong
  19. 19. DevOps Integration • Integrating and automating deployment processes for applications that never had them is a major productivity improvement • Legacy applications do not always have the needed infrastructure in place for repeatable and automated builds
  20. 20. Validation Legacy code tends to be light on tests, and that complicates validation and assurance phases of the containerization process
  21. 21. Operations Traditional operational tooling cannot currently deal with containers; new tools are likely going to be needed

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