Converting to a ZFS rootfs

My main desktop/server machine (running Debian sid) at home has been running XFS on mdadm raid-1 on a pair of SSDs for the last few years. A few days ago, one of the SSDs died. I’ve been planning to switch to ZFS as the root filesystem for a while now, so instead of just replacing the failed drive, I took the opportunity to convert it. NOTE: at this point in time, ZFS On Linux does NOT support TRIM for either …

Frankenwheezy! Keeping wheezy alive on a container host running libc6 2.24

It’s Alive! The day before yesterday (at Infoxchange, a non-profit whose mission is “Technology for Social Justice”, where I do a few days/week of volunteer systems & dev work), I had to build a docker container based on an ancient wheezy image. It built fine, and I got on with working with it. Yesterday, I tried to get it built on my docker machine here at home so I could keep working on it, but the damn thing just wouldn’t …

fakecloud

I wrote my first Mojolicious web app yesterday, a cloud-init meta-data server to enable running pre-built VM images (e.g. as provided by debian, ubuntu, etc) without having to install and manage a complete, full-featured cloud environment like openstack. I hacked up something similar several years ago when I was regularly building VM images at home for openstack at work, with just plain-text files served by apache, but that had pretty-much everything hard-coded. fakecloud does a lot more and allows per-VM …

lm-sensors configs for Asus Sabertooth 990FX and M5A97 R2.0

I had to replace a motherboard and CPU a few days ago (bought an Asus M5A97 R2.0), and wanted to get lm-sensors working properly on it. Got it working eventually, which was harder than it should have been because the lm-sensors site is MIA, seems to have been rm -rf -ed. For anyone else with this motherboard, the config is included below. This inspired me to fix the config for my Asus Sabertooth 990FX motherboard. Also included below. To install, …

Part-time sysadmin work in Melbourne?

I’m looking for a part-time Systems Administration role in Melbourne, either in a senior capacity or happy to assist an existing sysadmin or development team. I’m mostly recovered from a long illness and want to get back to work, on a part-time basis (up to 3 days per week). Preferably in the City or Inner North near public transport. I can commute further if there is scope for telecommuting once I know your systems and people, and trust has been …

backup-mysql.sh

A bash script to backup mysql databases, with separate schema and plain-text dump files (INSERT commands) for each database. Makes it easy to restore individual databases or copy them into dev/test servers. Keeps 30 days worth of backups in separate YYYY-MM-DD directories.

grub-list-kernels.pl

Due to boredom and needing something to do to keep my brain from atrophying, I’ve decided to polish some of the rough edges off some of my scripts so that they’re suitable for publication. here’s the first of them, a perl script to list kernels and other grub menu entries, with numeric indexing suitable for use with grub-set-default and grub-reboot

done

OK, I’m finished my experiment. It’s over now and I can “break character”. First, I have to offer special thanks to “tshirtman” for being the first to unambiguously exemplify one of my main points. well done! In case it’s not blindingly obvious (as it should be), the reason for my post was that I was outraged by the spectacle of one fairly high-profile member of the linux community trying to rally support to shun and exclude another fairly high-profile member …

I had a dream…

I had a dream that many prominent members of the Linux community were dressed in Nazi SS uniforms on the Arctic ice, clubbing baby seals to death. I can’t bear the thought that so many Linux people may secretly be Nazi seal murderers, so I demand that they be excluded from any future Linux-related events or conferences that I might wish to attend. My nightmare and the strength of my personal reaction to it are conclusive proof that they are …

openstack, bridging, netfilter and dnat

I just posted the following question to ServerFault….and then realised there might be people out there in magical internetland who know the answer but never visit any of the SO sites, so i’ve posted it here too. ¬†Feel free to respond here on on serverfault. In a recent upgrade (from Openstack Diablo on Ubuntu Lucid to Openstack Essex on Ubuntu Precise), we found that DNS packets were frequently (almost always) dropped on the bridge interface (br100). For our compute-node hosts, …