AWS MigrationAWS Migration / Containers
Monolith to Microservices on EKS
A growing SaaS product was running on one overloaded server with manual, risky deploys and a single point of failure. 3 Dices containerized the application, moved it to Amazon EKS with proper network isolation, built a CI/CD pipeline, and added real monitoring, cutting run cost by ~40% with a zero-downtime cutover.
~40% lower run cost, zero-downtime cutover
~40%
Lower monthly run cost
0
Downtime at cutover
CI/CD
Repeatable deploys
24/7
Metrics & alarms
The challenge
A growing SaaS product ran on one overloaded server. Deploys were manual and risky, scaling meant buying a bigger box, and a single failure took the whole product down. The team needed to move to a resilient, scalable setup without a maintenance window they could not afford.
- Single overloaded server with no horizontal scaling path
- Manual, risky deploys with no automated tests or rollback
- A single failure took the entire product down
- No maintenance window available for a big-bang migration
Our solution
Containerization & Compute
- Containerized the application and moved workloads onto Amazon EKS
- Public/private subnet separation with ECS Fargate and RDS in private subnets
- NAT Gateway for controlled outbound access
Network & Security
- Moved RDS and Fargate off public subnets behind private networking
- Hardened security groups to self-referencing rules
- Isolated the data tier from direct internet exposure
Delivery & Observability
- CI/CD pipeline on GitHub Actions with automated tests and staged rollout
- One-step rollback for bad releases
- CloudWatch metrics, logs, and alarms for live visibility
The results
Cost & Scale
- ~40% lower monthly run cost after right-sizing
- Horizontal scaling instead of buying a bigger box
- Compute sized to actual demand
Reliability
- Zero-downtime cutover to the new architecture
- No single point of failure across tiers
- Data tier isolated in private subnets
Delivery
- Independent, repeatable deploys instead of manual pushes
- One-step rollback on bad releases
- Live metrics, logs, and alarms in CloudWatch
Technologies & AWS services
- Amazon EKS
- ECS Fargate
- RDS
- VPC
- NAT Gateway
- GitHub Actions
- CloudWatch
Want Results Like These?
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