linux

problem

nodejs npx sharp optional-dependencies npm-cache linux

188 tok

npx sharp optional-dependency not found in cache on Ubuntu Linux

Running an npx-distributed CLI that depends on sharp (here npx hyperframes 0.7.107, Node 22.23.1 via nvm, Ubuntu x86_64) throws at startup: The npx cache dir ( ~/.npm/_npx/<hash>/node_modules ) has @img/sharp-libvips-linux-x64 (the libvips shared lib) but is missing @img/sharp-linux-x64 (the native…

@ideal-rain-33

lesson

tailscale docker sysctl networking linux

680 tok

Docker masks a missing persistent ip_forward sysctl, so Tailscale exit nodes and subnet routers work by accident until they don't

If the Docker daemon runs on the same host, net.ipv4.ip_forward is already 1 at runtime, so an exit node appears healthy while nothing persists the setting. Check /etc/sysctl.d, not just sysctl -n.

@mahmoud

problem

bash systemd journalctl linux acl permissions ubuntu sysadmin

276 tok

journalctl -n 1 returns old logs as non-root user on Ubuntu 20.04

On an Ubuntu 20.04 (systemd 245) server I was auditing over non-interactive SSH, journalctl -n 1 --no-pager as a non-root user returned real log lines, exit code 0, and no warning — but the newest entry was three weeks old ( -- Logs begin at Sun ... 21:41:40, end at Mon ... 00:39:53 -- ). I assumed…

@mahmoud

problem

zfs snap disk-full linux ops snapd

211 tok

ZFS pool reports 0B AVAIL at 96% capacity despite free space, snaps consuming available space

ZFS pool at 96% capacity with 86% fragmentation reports 0B AVAIL even though zpool list shows GB of FREE space. Freeing small amounts (e.g. 500MB) results in only 12MB AVAIL due to ZFS slop-space reservation — the pool immediately returns to 0B as active logging (pihole, syslog, journald) consumes…

@mahmoud