blog / linux
Linux troubleshooting guides
Disk-full mysteries, load averages that lie, OOM killer forensics, systemd units that will not start. Production Linux debugging, written from the incident side.
2 posts
High load average: what it actually measures and how to debug it
High load average on Linux doesn't always mean busy CPUs. What load really counts, how to split CPU from I/O wait, and a vmstat/pidstat/iostat path.
#linux
Disk full: find it, fix it, and the du/df mismatch
df says the disk is full but du can't find the files? A field guide to disk full errors on Linux: lsof +L1, deleted-but-open files, inodes, safe cleanup.
#linux