Terraform

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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Migration and DevOps for a CS-Cart Marketplace

Infrastructure and Deployment of a Multi-Vendor CS-Cart Marketplace Client Multi-vendor marketplace Challenge Revive a legacy marketplace project and migrate it from standard shared hosting to a modern cloud environment. Ensure high availability, build CI/CD infrastructure, set up test environments, integrate third-party delivery services, and automate routine operations with AI. At the final stage, prepare an on-premise server (NAS) on the client side for cold repository storage. Solution 1. Infrastructure in Yandex Cloud (Terraform) Built IaC configuration (Terraform) to provision Yandex Cloud infrastructure (virtual networks, VMs). Configured separate virtual machines for production and development environments. Attached and partitioned additional disks, deployed automated backups for databases and files to Yandex Object Storage (S3). Used Yandex Cloud Postbox for reliable service email delivery (domain, SPF, DKIM configured). 2. Containerization and Microservices Migrated the marketplace from classic hosting to a Docker-based VPS environment. Built a custom Dockerfile for CS-Cart and a docker-compose stack with a microservice-oriented web server architecture. Established full-featured dev and prod environments. Configured deployment pipelines via a local Git server (Forgejo). 3. Marketplace Platform (CS-Cart) Upgraded the CS-Cart core and optimized the database by removing obsolete, unused plugins. Deployed a clean platform installation with a new commercial theme. Configured multi-vendor business logic: role separation and seller dashboards. Integrated and configured modules: dynamic product loading, AI capabilities, smart live search, and SEO module. Integrated shipping (CDEK) and payment systems. Launched automated data exchange with 1C accounting systems. 4. Automation and n8n Deployed n8n process orchestration. Integrated ChatGPT API to automate repetitive operations such as content generation and normalization. Configured workers and triggers for store business workflows. 5. Security and Cloudflare Configured Cloudflare Proxy DNS. Implemented Cloudflare Turnstile to reduce spam during sign-up and checkout flows. Added bot protection: disabled direct registrations, configured strict caching, and filtered low-quality traffic. Installed SSL certificates and configured proper redirects. 6. On-Premise Infrastructure and Documentation Set up a dedicated subdomain with a wiki engine for technical and user documentation. Implemented local infrastructure in the client’s office based on Synology NAS: Docker, S3 buckets, and backups. Deployed a local Git server (Forgejo) with a CI/CD runner for version control and long-term preservation of project assets. Collected a complete backup of Terraform states, passwords, codebases, and configurations. 7. Project Archival and Repositories Migrated the production site to backup hosting for archival mode and disabled active synchronizations. Procured and configured Synology NAS in the office: external access, Docker, S3 buckets. Deployed Forgejo with a runner under the git.* domain. Repositories included: website source code, theme and add-ons, documentation, n8n workflows, Telegram bots, DB backups, terraform-yandex, terraform-cloudflare, and password vault. Technologies Docker Terraform Yandex Cloud Nginx Forgejo Linux Results ✅ Infrastructure: shared hosting → VPS in Yandex Cloud via Terraform, fully containerized with Docker ✅ Platform: clean CS-Cart Multi-Vendor installation replaced a heavily modified legacy core ✅ Theme and modules: commercial theme, live search, UX/UI improvements, SMS authentication, AJAX catalog ✅ Integrations: CDEK, Boxberry, Russian Post, Faster Payments System (SBP), and dual-environment 1C exchange ✅ Documentation: wiki on docs.* subdomain with a complete project structure ✅ Automation: n8n + ChatGPT API for routine operations ✅ Backups: Yandex Object Storage + mirrored copy on office Synology NAS ✅ Git: self-hosted Forgejo on NAS with runner and full project repositories ✅ Archival handover: project fully transferred to the client’s on-premise Synology NAS, including a private Forgejo Git server.

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