EXPLORE — THE WHOLE YGG SYSTEM
Explore
A chronological stream of everything — guides, troubleshooting, notes, analyses, projects and curated external sources.
note
A short finding that does not need a full article.
note The journal eats gigabytes before anyone notices The default journal cap is a tenth of the partition. On a small root that means gigabytes of logs nobody wants. note SPF, Postfix and rspamd: common delivery problems The most common reasons an SPF check rejects mail that is perfectly fine – in the DNS record, in Postfix and in rspamd. note Ubuntu 25.04 (Plucky Puffin): TPM disk encryption, an ARM64 desktop and APT 3.0 A non-LTS release from April 2025: TPM-backed disk encryption in the installer, an official ARM64 desktop, kernel 6.14 with sched_ext, APT 3.0 and the end of apt-key. note OpenSSH 9.0: scp over SFTP and hybrid key exchange An April 2022 release in which scp stopped using the legacy protocol and the default key exchange gained a post-quantum component. note Podman: containers without a daemon and without root A container tool with no permanently running daemon that can run as an ordinary user and generate systemd units. note The end of CentOS 8 and the distributions that replaced it After the December 2020 announcement that CentOS 8 would end, two independent RHEL rebuilds appeared during 2021 – AlmaLinux and Rocky Linux. note WireGuard in the mainline Linux kernel The WireGuard VPN protocol landed directly in the mainline Linux kernel in March 2020, without needing a separately maintained module. note Debian 9 (Stretch): MariaDB instead of MySQL, X without root A June 2017 release in which MariaDB became the default database and the X server stopped requiring root privileges. note Removing a package while breaking dependencies Force-removing a single package on a Debian-based system without letting apt pull the rest of a dependency chain with it. note Maildir: login mail notification and reading with mailx Getting new-mail notifications on login (including SSH) and reading local mail with mailx when the delivery agent uses Maildir. note XEN / XCP: a handful of useful notes Scattered fixes from running XEN Cloud Platform: VNC keymap, LVM storage type, the HVC console and CPU hotplug in a guest. note Debian 6.0 (Squeeze): dependency-based boot ordering A February 2011 release that switched the default boot script ordering to dependency-based sequencing and offered a FreeBSD kernel port as a technology preview. note Port forwarding on a firewall via NAT How to point a chosen port of a public IP at a service running on a private address on the firewall.