Linux

Setting up WireGuard end to end: interface, key pairs, IP forwarding, config files and a systemd unit for auto start.

Extracting the registrable domain in bash with a short awk expression, so .com and .co.uk both come out right.

Relaying mail through Amazon SES from Postfix on Ubuntu, filling in the steps the AWS documentation leaves out.

Renewing a Let's Encrypt certificate from cron with the webroot plugin, the matching nginx SSL block, and a stronger dhparam.

Installing a CentOS 6 built RPM on CentOS 5: rebuild it with rpmrebuild and the older file digest and payload macros.

GNU Parallel's citation notice, what --bibtex actually prints, and how to make it stop.

Disabling MSI on a bnx2 NIC by reloading the module with disable_msi=1 while keeping the link up, including the bonded interface case.

Making a 3TB disk usable in Linux with a GPT label under parted and ext4 with 1% reservation, plus the HP array controller catch.

Growing a Linux VM disk in place with a new partition, pvcreate, vgextend, lvextend and resize2fs, with no redeploy.

The 2012 leap second pinned Hadoop nodes at 100% CPU. Resetting the clock with date and restarting ntpd fixes it without a reboot.

Build order and configure flags for compiling Facebook Scribe with HDFS support: boost, thrift, fb303, then scribe itself.