Linux patching without surprise reboots or broken services
Linux patching without surprise reboots or broken services. Audit the exposure, understand the threat model, apply changes safely, and keep an independent…
Linux performance debugging: the first 10 minutes
Linux performance debugging: the first 10 minutes. A practical production guide with diagnostic commands, failure interpretation, and a safe decision sequence.
Linux process stuck in D state: why kill -9 does not work
Linux process stuck in D state: why kill -9 does not work. A practical production guide with diagnostic commands, failure interpretation, and a safe…
Linux PSI: detect CPU, memory, and I/O contention
Linux PSI: detect CPU, memory, and I/O contention. A practical production guide with diagnostic commands, failure interpretation, and a safe decision sequence.
Suspect a Linux rootkit? Preserve evidence before installing scanners
Suspect a Linux rootkit? Preserve evidence before installing scanners. Audit the exposure, understand the threat model, apply changes safely, and keep an…
Linux routing table debugging: which path will this packet take?
Linux routing table debugging: which path will this packet take?. A practical production guide with diagnostic commands, failure interpretation, and a safe…
Linux swap is used but memory is available: is that bad?
Linux swap is used but memory is available: is that bad?. A practical production guide with diagnostic commands, failure interpretation, and a safe…
systemd start request repeated too quickly
systemd start request repeated too quickly. A practical production guide with diagnostic commands, failure interpretation, and a safe decision sequence.
Zombie processes on Linux: what they consume and who must reap them
Zombie processes on Linux: what they consume and who must reap them. A practical production guide with diagnostic commands, failure interpretation, and a…
Load balancer health check failing while the app looks healthy
Load balancer health check failing while the app looks healthy. A practical production guide with diagnostic commands, failure interpretation, and a safe…
Request IDs that actually correlate logs across services
Request IDs that actually correlate logs across services. A practical production guide with diagnostic commands, failure interpretation, and a safe…
Logs vs metrics vs traces: which signal answers what?
Logs vs metrics vs traces: which signal answers what?. A practical production guide with diagnostic commands, failure interpretation, and a safe decision…
Managed database vs self-hosted: price the pager
Managed database vs self-hosted: price the pager. A practical production guide with diagnostic commands, failure interpretation, and a safe decision sequence.
Production dashboard design: questions before charts
Production dashboard design: questions before charts. A practical production guide with diagnostic commands, failure interpretation, and a safe decision…
Black-box vs white-box monitoring: combine symptom and cause
Black-box vs white-box monitoring: combine symptom and cause. A practical production guide with diagnostic commands, failure interpretation, and a safe…
Monitoring retention: choose by investigation window, not habit
Monitoring retention: choose by investigation window, not habit. A practical production guide with diagnostic commands, failure interpretation, and a safe…
MTU black hole: small requests work, large ones hang
MTU black hole: small requests work, large ones hang. A practical production guide with diagnostic commands, failure interpretation, and a safe decision…
Multi-region architecture cost: duplicate capacity and data movement
Multi-region architecture cost: duplicate capacity and data movement. A practical production guide with diagnostic commands, failure interpretation, and a…
Multi-region database recovery: replication is not a backup
Multi-region database recovery: replication is not a backup. A practical production guide with diagnostic commands, failure interpretation, and a safe…
MySQL backup consistency: transactions, locks, and binary logs
MySQL backup consistency: transactions, locks, and binary logs. A practical production guide with diagnostic commands, failure interpretation, and a safe…
NAT gateway cost: map private-subnet traffic first
NAT gateway cost: map private-subnet traffic first. A practical production guide with diagnostic commands, failure interpretation, and a safe decision sequence.
Netlify Functions versus conventional self-hosted software
Netlify can deploy open-source software quickly, but its runtime and storage model create tradeoffs. Here is where the friction appears and when a VPS is…
Nftables basics for an SSH host
Nftables basics for an SSH host. Audit the exposure, understand the threat model, apply changes safely, and keep an independent recovery path.
Nginx 502 Bad Gateway: find the broken hop
Nginx 502 Bad Gateway: find the broken hop. A practical, safe workflow with diagnostic commands, interpretation, common traps, and a repeatable operating…