SSH Tunnel Magic: Your SSH Already Is Tailscale
SSH punching for everyone who only knows ssh user@host — how -D replaces a corporate VPN, -R replaces a mesh VPN for NAT’d boxes, and -L forwards Unix sockets. 3 flags, 3 bonuses, 1 man page.
Infrastructure
Systemd Unreclaimable Kernel Memory Leak
How a frequently-restarting systemd unit with Type=exec leaked unreclaimable kernel slab memory (~60 MB/day) on Ubuntu hosts via a cgroup memory-accounting bug — and why only a full host reboot could free it.
Another Ubuntu Bug With a Stopgap Fix: apt-get update Hangs for Hours
apt-get update randomly hangs for hours on Ubuntu 24.04 LTS — known since 22.04, still not fixed. Worst part: it silently blocks unattended-upgrades, so your servers stop receiving security updates. The ‘fix’ is a cron job that kills stuck apt processes.
10G at Home: $15 M.2 Expander Turns an Old HP Mini Into a 10GbE Test Rig
My ISP started upselling 10gbit XGS-PON — but how to test it without buying a 10G-capable machine? A $15 noname M.2 → PCIe expander + AQC107 NIC on an old HP G2 mini did the job. Plus the pcie_aspm=off gotcha.