CATALOGUE — ALL YGG CONTENT
Catalogue
Everything that is here, in one place: browsable by type, topic and state. The stream shows the newest, the catalogue the complete list.
01 / SELECTION
Infrastructure stabilization Stabilizing an organization’s technical backbone: administration rules, documentation, a platform for testing and hosting, and a link to the infrastructure one level up. Multi-tenant platform A web application for multiple organizations on a shared core: separate data and settings for each client, a modular architecture and security from day one. Czech Digital and Information Agency: activity reports What actually moved in the digitalization of the Czech state – read through the data rather than the press releases.
02 / THE WHOLE CATALOGUE
explainer High availability and shared storage for a small XEN cluster How high availability and shared storage work for a small cluster of virtual machines on XEN. project Read-only Raspberry Pi for daily menu displays Daily menu displays in canteens across the country: a Raspberry Pi that survives being unplugged and deploys without anyone touching it on site. guide Moving off a probably compromised server onto clean infrastructure How the move of an organization’s services off a probably compromised server onto new infrastructure actually went: the old stack, the split into virtual machines, the upgrade trouble and the hardening. project Political party websites in Jekyll Running and developing several static websites of a political party in Jekyll, including a signpost site for regional elections. link RFC 7208: Sender Policy Framework The source text for SPF. It answers the questions blog posts disagree on – lookup limits, macros, and what each result actually means. project Update testing across architectures Verifying fixes of an enterprise Linux distribution before release – on x86, IBM Z and PowerPC, with a focus on virtualization. project Infrastructure migration Moving an organization’s services off a probably compromised server onto a newly designed infrastructure, running it long term and leading a technical team of volunteers. guide Roundcube over MySQL with SSL, plus the password plugin Connecting Roundcube to a MySQL server over SSL and a working password_query for the password plugin. project Packaging for RPM and Debian and the Open Build Service Building packages for both RPM- and Debian-based distributions – spec, dsc and control files, builds locally and in the Open Build Service. reference Postfix header_checks: rewriting mail headers A reference for the Postfix header_checks directive: rewriting, prefixing and dropping headers with regexp rules. 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. project XEN virtualization infrastructure Consolidating several servers onto the XEN XCP virtualization platform with high availability, shared storage and backups – including migration of running services. 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. reference Network bonding (etherchannel) on Debian A reference for round-robin network bonding on Debian, including the variant with a bridge for XEN. guide Examining a RAID member from a disk image with dd_rescue and mdadm Imaging a failing drive with dd_rescue and inspecting its mdadm RAID member over a loop device – without touching the original disk. guide Auditing the strength of your own WPA passphrase How to check whether your home Wi-Fi uses a weak WPA passphrase by capturing your own handshake and testing it offline. guide Restoring deleted files with extundelete Recovering deleted files from an ext3/ext4 filesystem with extundelete – mount read-only first and work by inode. project AIX and Linux administration Installation, upgrades, configuration and support of AIX and Linux systems on IBM Power – logical partitions, SAN, backups and high availability. reference iptables: rules for a home network A reference card for iptables. Superseded – on Debian 12 and newer, nftables does the same job. 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. troubleshooting Portmapper hangs at boot or shutdown The portmapper service stalls for a minute during boot or halt – how the issue was tracked down and resolved. 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. project Network administration for companies and the public sector End-to-end administration of networks and servers for private companies and the public sector – from network devices to mail, VPN and storage. project Infrastructure monitoring Watching load and availability of servers and networks – from SNMP and an information system for monitoring and helpdesk to Cacti on top of a virtualization infrastructure.
03 / CONTENT TYPES — INDEX
13 guide / how-to A practical procedure for solving a specific problem or task. 2 troubleshooting Problem → symptoms → diagnosis → cause → fix. 4 reference Configuration, commands, parameters and cheat sheets to look up. 10 explainer How a given system, technology or principle works. 13 note A short finding that does not need a full article. 10 link
04 / CONTENT STATES
draft unfinished text; still changing
outdated superseded — points to a newer solution
active the project is running and evolving
experimental works, but with no guarantees — under testing
archived unmaintained, read-only
unreachable the link target did not respond during the last check
Old content is never deleted — if it still has value it stays, clearly labelled with its state and the date it was last verified.