When dig Works but the Browser Does Not: Debugging macOS Split DNS
A practical way to diagnose stale per-domain DNS rules on macOS when one device reaches a site, dig succeeds, but browsers and curl time out.
Article archive
2026
Pebble vs LevelDB During an Avalanche C-Chain Replay
A field comparison of C-Chain replay throughput, database I/O, NVMe utilization, and the limits of an early-stage Pebble result.
When to Use rg, nl, Vim, and apply_patch
How ripgrep, nl, Vim, and apply_patch divide repository search, numbered evidence, interactive editing, and reviewable automated changes.
Shiden Recovery After a RocksDB Lock and litep2p Panic
How a Shiden archive RPC node recovered from a backup-held RocksDB lock and a separate litep2p panic after an EC2 downgrade, without deleting chain data.
Password Hashing Algorithms: Selection, Tuning, and Migration
An engineering guide to MD5, SHA, PBKDF2, bcrypt, scrypt, Argon2, yescrypt, and legacy password formats, with guidance on selection, tuning, and migration.
TDD in Go: Three Feedback Loops That Shape the Design
A Go pricing example that develops three behaviors through Red–Green–Refactor, stable testing seams, vertical slices, and a single external boundary.
Claude Code Hidden Prompt Markers: What the Date String Encodes
A technical reading of Thereallo’s report on classification data in Claude Code’s date prompt, its trigger path, and the implications for client trust.
Recovering an Erigon Mainnet Archive Node Stuck at Block 25393069
How an Erigon v3.5.0 archive node recovered from a repeatable gas-used mismatch at block 25393069 by rebuilding chaindata from existing snapshots.
Container Startup in Apple container, Docker, and Kubernetes
A layer-by-layer comparison of image handling, process startup, Pod sandboxing, and runtime boundaries in Apple container, Docker, and Kubernetes.
Google Credentials in Kubernetes Without a Committed Key
An EKS pattern for storing a Google service account JSON in AWS Secrets Manager, mounting it with Secrets Store CSI Driver, and setting GOOGLE_APPLICATION_CREDENTIALS.
When Lighthouse Says InvalidToken but Erigon Returns Forbidden
A Gnosis Erigon and Lighthouse Engine API failure that looked like a JWT problem but was resolved by correcting Erigon’s authrpc.vhosts allowlist.
Sizing and Isolating Archive/RPC Nodes on AWS
How to add archive/RPC nodes on AWS with narrow Terraform plans, isolated security groups, explicit disk sizing, and private RPC boundaries.
How to Read Astar and Shiden Catch-up Logs
How parachain and relaychain progress, finalized #0, peers, warp sync, pruning mode, snapshots, and client versions shape archive/RPC node catch-up.
A Small Grafana Dashboard for Blockchain Node Operations
A Prometheus and Grafana dashboard design for host health, RPC reachability, sync state, block height, peer count, and per-node filtering.
When Local RPC Works but Another EC2 Instance Times Out
How a private Erigon JSON-RPC timeout was isolated across node health, socket binding, caller reachability, and source security group rules.
Reading Substrate-Style and Erigon Sync Logs in Practice
How to distinguish parachain and relaychain catch-up, bootnode effects, Erigon snapshot stages, and sampled archive-readiness checks.
Testing Polygon Erigon v3.6.1-beta After the v3.6.0 Upgrade
A controlled test of Polygon Erigon v3.6.1-beta after v3.6.0 crossed the Chicago hardfork but left weak peer and post-hardfork sync signals.
Deploying a New EKS Service: GitOps, Internal ALB, and Cloudflare DNS
A deployment record for a Spring Boot service on EKS, covering ECR, GitLab CI, ArgoCD, Ingress, an internal ALB, Route 53, and Cloudflare DNS.
Fixing a Polygon Erigon Archive Node Stuck at Block 87218600
How a gas-used mismatch at Polygon block 87218600 was traced to the Chicago hardfork and fixed by upgrading 0xPolygon/erigon from v3.5.0 to v3.6.0.
Debugging an AWS Glue iam:PassRole AccessDenied Error
How an AWS Glue updateJob AccessDenied error was traced through IAM group policy, managed-policy scope, MFA guardrails, and IAM simulator results.
What Erigon3 Is Doing After Startup
A subsystem-by-subsystem explanation of Erigon3 startup logs, including snapshots, Execution, P2P, trie work, and Polygon Heimdall sync.
Closing Public Port 8545 on a Polygon Erigon Archive Node
How a dedicated AWS security group kept Polygon P2P ports public while closing JSON-RPC, metrics, private API, and SSH ingress.
Fixing Too Many Authentication Failures in an iTerm SSH Profile
Why an SSH agent can exhaust MaxAuthTries before the intended key is offered, and how IdentitiesOnly and IdentityAgent fix the profile.
Migrating an AWS S3 File Gateway Without Breaking User Drive Mappings
A migration runbook for replacing a legacy S3 File Gateway, rebuilding cache safely, and moving Windows drive mappings with SSM State Manager.
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