Aws

AWS → Another Cloud Migration

Cloud Infrastructure Migration from AWS to a Cost-Optimized Private Cloud Client Confidential Challenge The client needed to migrate their entire AWS infrastructure to an alternative cloud provider to reduce costs and eliminate vendor lock-in. The key requirements were minimal downtime, zero functionality loss, and a reliable rollback strategy. Solution 1. Audit & Planning Full inventory of AWS resources (EC2, RDS, S3, VPC) Service mapping: AWS → target cloud equivalents Phased migration plan with clear milestones Rollback strategy for each stage 2. Infrastructure Preparation Terraform for IaC on the target platform VPC, subnets, and security groups configuration Managed PostgreSQL and Redis deployment Object Storage setup (S3-compatible) 3. Data Migration Database replication via DMS S3 → Object Storage sync Docker image transfer to private Container Registry Full validation on staging environment 4. Production Cutover DNS failover for gradual traffic switching Real-time metrics monitoring during cutover AWS kept on standby for emergency rollback Final cutover completed in 2 hours Technologies AWS Terraform Prometheus Grafana GitLab CI Results ✅ Cost reduction: 40% savings (from $15k to $9k/month) ✅ Downtime: only 2 hours vs. 8 hours planned ✅ Vendor independence: full exit from AWS with no functionality loss ✅ Performance: maintained at the same level post-migration ✅ Compliance: data residency and security requirements met

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Geo-Distributed Blockchain Node Cluster in Kubernetes

Geo-Distributed Blockchain Node Cluster in Kubernetes Client Cryptocurrency platform (Web3 / DeFi) Challenge The client needed fault-tolerant infrastructure to run ETH and BSC full nodes across four regions (EU, US, AP, LatAm) with minimal latency for end users, DDoS and RPC spam protection, secure HSM-based transaction signing, and centralized observability. Cold node sync takes 2–3 weeks — a fast-bootstrap solution was required. Solution 1. Infrastructure & IaC (Terraform + EKS) Terraform modules: VPC, subnets, security groups for 4 regions (Frankfurt, Virginia, Singapore, São Paulo) Managed Kubernetes (EKS 1.29+) per region with dedicated node pools: full nodes, archive nodes, signing service NVMe StorageClass (gp3) via CSI driver for high-performance chaindata storage Helm charts for geth / bsc-node with per-region custom values 2. GitOps: Flux CD Multi-Cluster Flux CD v2 with Kustomization per region — single source of truth for all clusters Secrets management: HashiCorp Vault + External Secrets Operator (ESO) All infrastructure changes applied via git push — no direct cluster access required 3. Load Balancing & Anti-Spam HAProxy 2.8: sticky sessions, health checks via eth_syncing — traffic routed only to fully synced nodes Nginx Ingress: rate limiting, IP reputation filtering (Lua-based, fail2ban-style) Cloudflare Workers: geo-routing + L7 DDoS protection Custom Go sidecar: health endpoint returns ready only when node is fully synced 4. HSM Integration for Transaction Signing AWS CloudHSM (prod) / YubiHSM2 (staging) for private key storage Go microservice with PKCS#11 abstraction — swap HSM vendor without rewriting code Isolated K8s namespace + NetworkPolicy: no egress except to HSM endpoint gRPC API for backend: sign tx, get pubkey Full audit log of all signing operations → Loki 5. Monitoring & Alerting Custom Prometheus exporter (Go): eth_blockNumber, eth_syncing, peer count per node Grafana dashboards: sync lag, block height per region, RPC latency, SLO 99.9% Alertmanager → PagerDuty: alerts on block lag > N blocks, node down, peer count below threshold Loki + Promtail: structured logs from all nodes with region/pod correlation 6. Operations & Disaster Recovery Snapshot bootstrap: chaindata from S3 via rclone — node ready in hours instead of weeks DR playbook: step-by-step runbooks for regional recovery Chaos Engineering (Chaos Mesh): node kill, network partition, pod failure tests Architecture Decision Records (ADR) for all key design choices Technologies Kubernetes Terraform Helm Flux CD Prometheus Grafana Results ✅ Geo-routing: latency reduced by routing users to the nearest region ✅ Fast bootstrap: node ready in hours via S3 snapshot instead of 2–3 weeks of sync ✅ Anti-spam: rate limiting + IP reputation — public RPC handles bot load without degradation ✅ HSM: private keys never leave the hardware module ✅ GitOps: every infrastructure change goes through git with a full audit trail ✅ SLO 99.9%: tracked in Grafana, PagerDuty alerts on any degradation

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Self-Hosted Project Management with Plane

Self-Hosted Project Management with Plane So Client A company seeking its own project management tool hosted on their office infrastructure Challenge The client wanted an open-source alternative to Jira/Linear for project and task management, deployed on their own server within an existing Coolify environment. Requirements included: installing the latest version of Plane CE, ensuring proper operation behind Traefik reverse proxy, extracting the database as a separate Coolify service for convenient archiving, and setting up regular backups for all data.

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