Topic
Cloud / SRE
Operational notes on reliability, incident response, observability, and production infrastructure.
This topic collects field notes about operating systems in production: reliability reviews, incident response patterns, observability choices, and operational tradeoffs.
Articles
Recovering an Erigon Mainnet archive node stuck at block 25393069
A field note from an Ethereum Mainnet Erigon archive-node incident: v3.5.0 kept failing with a gas-used mismatch at block 25393069, and rebuilding only chaindata from existing snapshots recovered the node.
Apple container, Docker, and Kubernetes: what actually starts a container
A practical layer-by-layer comparison of Apple container, Docker, and Kubernetes: image handling, process startup, Pod sandboxing, and runtime boundaries.
Mount Google Application Credentials into a Kubernetes Pod without Committing the Key
A reusable EKS and Kubernetes pattern for storing a Google service account JSON in AWS Secrets Manager, mounting it with Secrets Store CSI Driver, and letting Java read it through GOOGLE_APPLICATION_CREDENTIALS.
When Lighthouse Says InvalidToken but Erigon Returns Forbidden
A field note on fixing a Gnosis Erigon and Lighthouse Engine API connection that looked like a JWT problem but was actually a vhost mismatch.
Why I Moved a Polygon Erigon Archive Node from v3.6.0 to v3.6.1-beta
A field note on moving a Polygon Erigon archive node from the Chicago hardfork release to the v3.6.1 beta after peer and post-hardfork sync symptoms stayed suspicious.
Deploying a New EKS Service: GitOps, Internal ALB, and Cloudflare DNS
A practical deployment and troubleshooting record for a Spring Boot service on EKS: ECR, GitLab CI, ArgoCD, Ingress, internal ALB, Route53, and Cloudflare DNS.
Fixing a Polygon Erigon Archive Node Stuck at Block 87218600
A field note on diagnosing a deterministic gas-used mismatch at Polygon's Chicago hardfork activation block and fixing it by upgrading 0xPolygon/erigon from v3.5.0 to v3.6.0.
Debugging an AWS Glue iam:PassRole AccessDenied Error
A field note on tracing a Glue updateJob failure from the console error to IAM group policy, managed policy scope, MFA guardrails, and final simulator validation.
Why I Closed Port 8545 on a Polygon Erigon Archive Node
A practical security group change that moved a Polygon Erigon archive node from allow-all inbound traffic to a minimal public surface.
When an iTerm SSH Profile Suddenly Stops Working
A short field note on diagnosing SSH profiles that fail with too many authentication failures.
Migrating an AWS S3 File Gateway Without Breaking User Drive Mappings
A practical migration pattern for replacing a legacy S3 File Gateway, rebuilding cache safely, and moving Windows users with SSM State Manager.