devops
17 minRelease Safety Advanced: State, Schema Compatibility, and Artifact Trust
Connect immutable infrastructure, safe schema evolution, IaC lock recovery, artifact provenance, and CI isolation into one release discipline.
Search the library
11 matching resultsArticles and interview answers
Q&A
Q&AWhy can a binary rollback fail after a database migration?
Rollback restores code, not every side effect. Expand-and-contract changes preserve compatibility during overlap, and recovery assumptions must be exercised.
Read the concise answer
Rollback restores code, not every side effect. Expand-and-contract changes preserve compatibility during overlap, and recovery assumptions must be exercised.
devops
5 minDevOps Foundations: Safe Changes, Health Signals, and Rollback Boundaries
Design a release as a controlled change to code, configuration, and data, with explicit health checks and a recovery plan that matches what can actually be reversed.
Q&A
Q&AHow do you safely recover a Terraform state lock after a crashed job?
Verify the lock holder is truly gone and preserve state before force-unlocking.
Read the concise answer
Inspect lock metadata, backend state, and the pipeline that acquired it; confirm no apply is still running. Preserve a state backup and compare cloud reality before force-unlocking the specific stale lock. Then run and review a plan. Force-unlocking a live writer can permit competing state updates and corrupt tracking.
databases
10 minDatabase Locks and Isolation: Diagnose Blocking, Deadlocks, and Retries
Understand transaction conflicts, lock waits, isolation anomalies, and safe retry boundaries across relational databases.
unix
9 minLinux Disk Full Errors: Blocks, Inodes, Deleted Files, and Safe Cleanup
Diagnose ENOSPC when disk usage looks confusing, including exhausted inodes and deleted files still held open.
kubernetes
5 minKubernetes CronJobs: Timezones, Missed Starts, and Duplicate Work
Operate a scheduled report as a reconciled workload with explicit timezone, lateness limits, and application-level deduplication.
Q&A
Q&ADoes If-Match make a lost-response write safely identifiable on retry?
No; it identifies an expected version, not a logical operation.
Read the concise answer
A committed first attempt advances the validator, so a repeat with the old validator may fail with 412. Use a separate scoped idempotency contract when retries must recover the original result.