Practical articles on AI, DevOps, Cloud, Linux, and infrastructure engineering.
When a service is slow and every dashboard looks green, bpftrace lets you watch the kernel directly. These one-liners found our tail latency.
A cron job silently stopped running for three weeks and nobody knew until the backups were missing. systemd timers give you the logging and status cron never did.
A container with a 2-core limit was pegged at 100% CPU yet running slow. The throttling counter told the real story, and it wasn't the number we set.
Free memory is a lie and load average doesn't see memory stalls. How Pressure Stall Information gives you a direct, early signal of memory contention — and how we wired it into alerts and autoscaling.
When the service is slow and the network is suspect, these are the tools we reach for, in this order, with the exact flags that find the answer.
io_uring replaces epoll for new high-throughput services. The patterns that earn their place, the gotchas in older kernels, and where we'd still pick epoll.
cpu.shares vs cpu.cfs_quota_us vs memory.max — the cgroup mechanics behind Kubernetes resource limits, and the surprises that explain the weird symptoms you've seen.
bpftrace one-liners replace strace, perf top, and a half-dozen ad-hoc debugging scripts. The patterns that actually earn their place when you're troubleshooting at 2 AM.
We migrated most scheduled jobs from cron to systemd timers. The wins, the gotchas, and the cases we kept on cron anyway.
A curated list of shell one-liners that earn their place in real ops work — the ones I reach for weekly, not the trick-shot variety.
Generate an SSH key, set up passwordless login, and configure aliases for the servers you use daily — all without copy-pasting yet another long command.
A clear walkthrough of Linux file permissions. Read the funny rwx- letters, change them safely with chmod, fix "permission denied" errors with confidence.
