Aws on DevOps Engineer & CloudAdmin

AWS → Another Cloud Migration

Mon, 01 Jan 0001 00:00:00 +0000

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

Geo-Distributed Blockchain Node Cluster in Kubernetes

Mon, 01 Jan 0001 00:00:00 +0000

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

Self-Hosted Project Management with Plane

Mon, 01 Jan 0001 00:00:00 +0000

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.