16 articles tagged with Sysadmin.
CERN is moving accelerator control computers to Debian because RHEL raised its minimum CPU level. Check your own fleet's x86-64-vN support before the next OS upgrade does it for you.
The default filesystem your distro picks is not always the right one for your workload. Here is what actually differs and when each one wins.
journald is the default log sink on every systemd distro, and most of it runs on defaults nobody chose. Here is how to actually control it.
\"It's always DNS\" is a joke because the failure modes are so scattered: resolver config, caching, search domains, split DNS. Here is where to actually look.
The disk is full and the app is still running. Here is how to grow a logical volume and its filesystem underneath live workloads, safely.
iptables still works, but nftables is what every modern distro ships by default now. Here is how the two actually differ and how to migrate a real ruleset.
A field-tested workflow for diagnosing why a systemd unit refuses to start, from status output to exit codes to the usual root causes.
When a Linux box misbehaves, the same dozen problems come up again and again. This is the map: what each symptom means and the fast path to the fix.
A likelihood-ordered checklist for tracing "Permission denied" on Linux through mode bits, ownership, ACLs, SELinux, and mount options.
A field-tested workflow for finding which process burns your CPU and whether the time is user, system, or iowait.
The kernel killed your process to save the box, and the log looks like noise until you know exactly which fields to read.
Load average counts more than CPU demand, so a high number needs a diagnostic path before you reach for a fix.
