The Raspberry Pi is a useful platform for self-hosting applications. More often than not self-hosted applications are supplied as container images. I used to run one application on one Raspberry Pi. The Raspberry Pi 4 ships with a 1.5GHz Quad-core CPU, USB3 and upto 8GB RAM. Here I am looking at clustering four to host …

The more I use Visual Studio the more features and extensions I find which really help my workflow. I tend to work with many headless remote systems from Windows jump servers. I’ve traditionally used PuTTY and MTPuTTY (Multi-Tabbed PuTTY) as SSH client and CyberDuck or WinSCP to copy files via SFTP over SSH. The …

When I worked as an architect working with AWS I used event-driven automation with AWS Lambda to integrate distributed systems. This event-driven automation allowed me to put complex systems in place very simply. The VMware Event Broker Appliance (VEBA) aims to facilitate event-driven automation based on vCenter Server …

VMware Cloud Foundation provides automated initial deployment and ongoing lifecycle management upgrades. Here I am exploring lifecycle management upgrades and exploring ways to make this as efficient as possible. Bundle Download The SDDC Manager appliance controls the Cloud Foundation deployment. To upgrade the …

Following on from base Ubuntu build here I begin to look at Parrallel Programming. Parrallel Programming Each Raspberry Pi is a small unit of compute, one of my goals is to understand how operating many in a cluster. There are various approaches to parallel computational models, message-passing has proven to be an …

Following on from base Ubuntu build here I look at the comparing the storage performance of SD and USB. SD Card Performance Linux FIO tool will be used to measure sequential write performance of a 4GB file: fio --randrepeat=1 --ioengine=libaio --direct=1 --gtod_reduce=1 --name=test --filename=test --bs=4k --iodepth=64 …

Following on from Raspberry Pi Cluster here I look at the base Ubuntu build. Install and Configure I used Raspberry Pi imager to install the Ubuntu 20.10 64bit on each SD Card. Insert these into the Pi’s and power them on. The image is configured with DHCP client, Pi device MAC addresses are prefixed DC:A6:32. I …

I have worked most of my professional life with systems built with Intel x86, x64 and ia64 chips. Intel processors use Complex Instruction Set Computing while Arm uses Reduced Instruction Set Computing. Processors with CISC architecture look to move complexity to hardware to simlify code, so small code sizes with high …

macOS 10.15 Catalina changed default Terminal from bash to zsh. When I first moved I tried Powerline extension but it was always a bit slow and really I all I need is a custom prompt. So today I revisited this and created a custom prompt for Zsh and learned a little along the way. First I create an empty ~/.hushlogin …

iSH is a project which offers a Linux shell environment on iOS using a usermode x86 emulator. The emulator is based on Alpine Linux but does not ship with SSH or APK the Alpine Linux package manager. To install the package manager with iSH and ultimately other tools we can download this with Safari from following URL. …