smcleod.net
The blog of Sam McLeod
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In 2018 I set out to replace our XenSever 7.2 based virtualisation after Citrix essentially screwed over free / open source users. This project was...
Last weekend I headed to New Zealand and marshalled at the Highlands Festival of Speed. The Highlands Festival of Speed is a weekend packed with...
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This is a stock photo of a Canary.
It should be available both here and in this public repo.
I wanted an alias or function to use youtube-dl in the background. Looking around the web lots of people seemed to want this and most of them were banging their...
This feature annoys me endlessly, I end up zoomed in and out of websites all over the internet. … But the fix is easy and there’s no addons required. Navigate...
It was almost 3 years ago that my open source storage project went into production. In that time it’s been running 24/7 serving as highly available solid state storage for...
“A chain is no stronger than its weakest link” Any improvement made anywhere besides the bottleneck is an illusion. Any improvement made after the bottleneck is useless because it will...
Here are my top album pics for 2017 (in no particular order) Note: This is by no means an exhaustive list, it’s just the top albums that really stood out...
My good friend Joel Shea received a most unlikely gift this Christmas - A vintage HP 4951 Protocol Analyser. According to the HP Computer Museum: Original Price: $3595 The 4951B...
This annoys me endlessly as I seem to often have my hand on control / cmd from working in the terminal. Turns out it’s an easy fix in Firefox’s about:config:...
Using GlusterFS to provide volume storage to Kubernetes as a replacement for our existing file and static content hosting. This talk was given at Infracoders on Tuesday 14th Novemember 2017....
In vim, you can add a comment at the top of files to set the syntax, e.g.: # vim: syntax=ruby In SublimeText there are many ways to detect syntax, one...
Earlier this week we started the process to upgrade one of our hypervisor compute clusters when we encountered a rather painful bug with HP’s Broadcom NIC chipsets. We were part...
We’re in the process of shifting from using our custom ‘glue’ for orchestrating Docker deployments to Kubernetes, When we first deployed Docker to replace LXC and our legacy Puppet-heavy application...
Of all the tools for reading news and subscribing to software releases, I still find RSS the most useful. I use Feedly to manage my rss subscriptions and keep all...
A hypothetical scenario in the form of a metaphor The Airline There is a Airline with good morals and prides itself on it’s ability to provide services to it’s customers....
note: open images in a new tab to display in full resolution
I wanted to try Android for a couple of weeks, I like staying on top of technology, gadgets and making sure I never become a blind ‘zealot’ for any platform...
note: This is a follow up post from 2015-07-21-rcd-stonith A Linux Cluster Base STONITH provider for use with modern Pacemaker clusters. This has since been accepted and merged into Fedora’s...
Ever forgotten to add a critical service to monitoring? Want to know if a service or process fails without explicitly monitoring every service on a host? …Then why not use...
Credits: George Hansper, Ricardo Vassellini, Evgeny Shebanin, Sam McLeod Scripts and source available here: sql_ascii_to_utf8 The Goal To be able to take a Postgres Database which is in SQL_ASCII encoding,...
The most common way to use rsync is probably as such: rsync -avr [email protected]<source>:<source_dir> <dest_dir> Resulting in 30-35MB/s depending on file sizes This can be improved by using a more...
This is a quick tldr there are many other situations and options you could consider. FIO man page IOP/s = Input or Output operations per second Throughput = How many...
Let’s pretend you have a project on Gitlab called ask-izzy and you want to mirror it up to Gitlab which is located at https://github.com/ask-izzy/ask-izzy Assuming you’re running Gitlab as the...
Today we launched a mobile website for homeless people … and it was launched by Australia’s Prime Minister Today we served up over 87,000 requests to the site and it’s...
If a disk / VDI is orphaned or only partially deleted you’ll notice that under the SR it’s not assigned to any VM. This can cause issues that look like...
“Having a SCSI ID is a f*cking idiotic thing to do.” - Linus Torvalds …and after the amount of time I’ve wasted getting XenServer to play nicely with LIO iSCSI...
Slides:
Failover Demo Video:
Seeking a Linux Systems Engineer to join our Ops team in a fast moving DevOps environment. Infoxchange is a not-for-profit organisation that delivers technology for social justice, we work to...
In an attempt to avoid using the Juniper Pulse (Now Pulse Secure) VPN client we tried OpenConnect but found that DNS did not work correctly when connected to the VPN....
Over the last two months I’ve been runing selected IO intensive servers off the the SSD storage cluster, these hosts include (among others) our: Primary Puppetmaster Gitlab server Redmine app...
Set update channel to receive developer beta update sudo softwareupdate --set-catalog https://swscan.apple.com/content/catalogs/others/index-10.11seed-10.11-10.10-10.9-mountainlion-lion-snowleopard-leopard.merged-1.sucatalog.gz Set update channel to receive public beta update sudo softwareupdate --set-catalog https://swscan.apple.com/content/catalogs/others/index-10.11beta-10.11-10.10-10.9-mountainlion-lion-snowleopard-leopard.merged-1.sucatalog.gz List available updates sudo softwareupdate –list...
67,300 read IOP/s on a VM on iSCSI (Disk -> LVM -> MDADM -> DRBD -> iSCSI target -> Network -> XenServer iSCSI Client -> VM) Per VM and scales...
A modified version of John Sutton’s rcd_serial cable coupled with our Supermicro reset switch hijacker: This works with the rcd_serial fence agent plugin. Reasons rcd_serial makes for a very good...
First some background… One of the many lessons I’ve learnt from my Linux HA / Storage clustering project is that the Debian HA ecosystem is essentially broken, We reached the...
Due to several recent events beyond my control I’m a bit behind on the project - hence the lack of updates which I appologise for. The goods news is that...
Docker config to setup XO which is a web interface to visualize and administrate your XenServer (or XAPI enabled) hosts Github: sammcj/docker-xen-orchestra Running the app Updates are pushed to the...
Just whipped up a brief demonstration of the failover and recovery process on the storage clusters I’ve built:
A high level talk from Infracoders Melbourne on 12/04/2015.
Linux Kernel CI for Debian Github: sammcj/kernel-ci Those of us using technologies such as Docker and BTRFS or simply trying to gain a performance edge on the competition have a...
Inspired by http://zitseng.com/archives/7489 Source (Github) WARNINGS Do not run unless you understand what this is doing The CA system is broken by design - This is not a fix for...
Over the coming month I will be architecting, building and testing a modular, high performance SSD-only storage solution. I’ll be documenting my progress / findings along the way and open...
Intro At Infoxchange we use XenServer as our Virtualisation of choice. There are many reasons for this including: Open Source. Offers greater performance than VMware. Affordability (it’s free unless you...
At the end of every year I note down a summary of the best applications, hardware & websites I’ve enjoyed & depended on throughout the year (and often for some...
Presented a Melbourne Search – July 2014 – ‘Search – A Journey of Delivery on a Budget’.
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Video here
The way we work at Infoxchange has changed greatly. A retrospective journey into transforming Infoxchange’s technology and culture over the past 24 months - presented a Melbourne DevOps – December...
Further to my earlier post on XenServer storage performance with regards to directly attaching storage from the host, I have been analysing the performance of various SSD storage options. I...
