unix
9 minDNS Troubleshooting: Trace Name Resolution Before Blaming the Network
Separate resolver configuration, caching, search domains, authoritative records, and application-level DNS behavior.
Search the library
192 matching resultsArticles and interview answers
Q&A
Q&AWhy rotate a session identifier after authentication?
Rotation limits session fixation. A session identifies a principal, while each protected operation still requires independent authorization.
Read the concise answer
Rotation limits session fixation. A session identifies a principal, while each protected operation still requires independent authorization.
kubernetes
5 minKubernetes Foundations: Services, Configuration, and Least-Privilege Access
Connect replaceable Pods through stable Services and reason about configuration, credentials, namespaces, and workload API permissions.
databases
9 minMySQL InnoDB: Transactions, Indexes, and Reading EXPLAIN
Understand InnoDB's clustered primary key, secondary-index lookups, transaction behavior, and practical query-plan analysis.
Q&A
Q&AWhy is a unique resource ID insufficient for tenant authorization?
Identity selects a resource; trusted scope and action policy grant access.
Read the concise answer
Derive tenant context from verified membership, apply it in lookup and mutation predicates, and check the requested action. Cache hits, downloads, and background jobs need the same scope enforcement.
kubernetes
6 minKubernetes disruption budgets: protect capacity, not every failure
Understand eviction admission, readiness accounting, and why a drain can correctly refuse to proceed.
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.
security
6 minTenant authorization: carry trusted scope into every lookup
Bind resource access to authenticated tenant membership instead of treating object identifiers as permission.