Kubernetes Migration: From Legacy Infrastructure to Modern Platforms
A migration that goes wrong costs more than one that never happened. That is why we do it incrementally, with rollback available at every step.
Kubernetes migrations rarely fail because of Kubernetes. They fail due to missing rollback strategies, underestimated containerization effort, and migrations that try to change too much at once. After 20+ migrations, CCsolutions has developed a methodology that controls risk at every phase.
The most common challenges
Big-Bang migrations create uncontrollable risk
Migrating everything at once means no plan B. A single undiscovered dependency can block the cutover, leaving the team debugging in an unfamiliar environment while production systems are affected.
Hidden dependencies surface at cutover
Monolithic applications have undocumented dependencies: hardcoded IPs, shared filesystems, undocumented cronjobs. These surface during assessment, or during a production outage.
The team does not know Kubernetes well enough for ongoing operations
Executing a migration is one thing, operating the resulting system is another. If the internal team does not know Kubernetes, production operations start with a knowledge gap that translates into incidents.
The CCsolutions approach
CCsolutions runs Kubernetes migrations in three controlled phases. Phase 1: Assessment, every application, dependency, and undocumented service is mapped before the first line of Dockerfile is written.
Phase 2: Containerization and parallel operation. Applications are containerized and run alongside the existing infrastructure, not replacing it. Traffic still routes through the old environment while the new one is validated.
Phase 3: Incremental cutover via Blue-Green Deployment. 10% of traffic, then 50%, then 100%, with automatic rollback trigger on error rate increase. The way back is always open.
Technologies
Frequently asked questions
How long does a complete Kubernetes migration take?
Small environments (5-10 services): 6-8 weeks. Medium environments (20-50 services): 3-4 months. Enterprise environments: 6-12 months.
What happens with legacy applications that cannot be containerized?
Not every application needs containerization. We define per-service migration strategies in the assessment: Containerize, Lift-and-Shift on VM-based nodes, or Keep-as-is with Kubernetes as an orchestration layer above.
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