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A collection of 59 posts

qemu-system-x86 Creating an idempotent VM with SSH enabled via cloud-init and qemu monitor enabled over tcp

qemu-system-x86 Creating an idempotent VM with SSH enabled via cloud-init and qemu monitor enabled over tcp

GitHub - chrisjsimpson/qemu-system-x86_64-bootstrap-me-an-ubuntu-vm-idempotentContribute to chrisjsimpson/qemu-system-x86_64-bootstrap-me-an-ubuntu-vm-idempotent development by creating an account on GitHub.GitHubchrisjsimpson The above repo is the result of needing/wanting to be able to quickly bootstrap an Ubuntu VM in an idempotent way. This is especially useful for validating setups/bootstraps of lower level

FastHTML getting started & comparison with Flask

FastHTML getting started & comparison with Flask

FastHTML is built on-top of the popular python libraries starlette, and uvicorn. FastHTML introduces Python types for common HTML elements integrated with HTMX which means you don't need to write html templates directly, and save a lot of time (in theory). It's like traditional HTML, meets stronger typing, meets niche

Installing WireGuard VPN on Windows

Installing WireGuard VPN on Windows

Step 1: WireGuard download the Wireguard Windows installer Step 2: Run the installation file and the installation should automatically complete Step 3: Once the WireGuard client opens upon installation, you'll need to add tunnels to start using WireGuard. 💡What are tunnels? They are used to create a virtual network interface

Windows containers how to...not?

Windows containers how to...not?

Things to know about Windows Containers This started as an initial research into Windows Containers. My initial impression was not fantastic, left wanting. * "Windows requires the host OS version to match the container OS version" (src) * This is in stark constrast compared to Linux containers, where you can trivially, swap

A practical, detailed guide to Git branching strategy, issue creation and merging

A practical, detailed guide to Git branching strategy, issue creation and merging

Question: I would like to ask for an explanation about git best practices. Like git branching, naming branches etc Sidenote- why does all this matter & why should I care about issues, git and branching? Have you ever.. * Not had enough information about an issue/bug? * Struggled to find a link

DevOps with physical servers using Redfish Python api

DevOps with physical servers using Redfish Python api

Using the Redfish ('standard') REST api, you can command and control iDRAC enabled servers just like you would your software. Software continues to eat the world, and is coming for your hardware. Why do we not treat our physical servers as part of our DevOps / operations processes? I think it's

How do I login ssh to an IPv6 server from an IPv4 internet connection?

How do I login ssh to an IPv6 server from an IPv4 internet connection?

Goals * Not everybody has an IPv6 address (see IPv6 adoption per country): * Given a valid account (ssh), allow a user on an IPv4 connection ssh to an IPv6 server running on an IPv6 host. Let's get tunnelling! * Critical goals: To the user, they should still be able to simply ssh

Photo by Greg Lloyd 1969, Photo of Hypertext Editing System (HES) console at Brown University, circa October 1969.

How to search backwards on tmux

How to search backwards/upwards on tmux. To enable tmux scroll back history press: Ctrl + b and then [. That's the Control key, and b , let go, and then press [ (the left square bracket). You'll then be able to scroll backward/forward. But how do you search? Hint: To go back

Make Playwright faster: experimenting with containers and build caching on Github actions

Make Playwright faster: experimenting with containers and build caching on Github actions

GitHub - KarmaComputing/playwright-testingContribute to KarmaComputing/playwright-testing development by creating an account on GitHub.GitHubKarmaComputing Background: We started using Playwright very early on, and had ended up with a test suite which was taking too long to run, and especially long on our pipelines (sounds familiar?). In the interest of

How to write a secure container

How to write a secure container

So, how do you write a secure container? Rule 1: Know where your data is coming from Common things to avoid: * Pulling images from public registries * Know your dependencies Solution: Maintain your own copy of dependencies, and keep up to date when new patches are released to adress security issues

The Kubernetes history- the project which almost never happened

The Kubernetes history- the project which almost never happened

"It's 2013. The environment in silicon vally was on the heels of the devops movement, automation tools were all the rage" - Kelsey Hightower, Principal Engineer, Google. The speakers in the 2022 Kubernetes documentary by Honeypot includes a fantastic list of speakers reflecting on the early days of Kubernetes and

It's time to let go of Centos, and has been that way for a long time

It's time to let go of Centos, and has been that way for a long time

It's perhaps human nature to cling to the familiar, it's the availability heuristic (we tend to reach for solutions which are easily recalled from memory- regardless of whether it happens to be the best fit. Good enough is sometimes what you need. Case in point, a proxy 'envoy proxy', is

How to disable Wordpress https redirect, the many ways

How to disable Wordpress https redirect, the many ways

For local dev this is useful. Because Wordpress is a wild west there may be different reasons your wordpress install is redirecting to https when you don't want it to: #1 Update wp-config.php Inside your `wp-config.php`: define('WP_HOME','http://example.co.uk'); #2 Check .htaccess There might

TiDB SQL Database NewSQL

TiDB SQL Database NewSQL

Little known in the UK TiDB (soon to launch TiDB Cloud) is a significant change in how you think about traditional relational database- which typically can't scale horizontally. > TiDB: Distributed, horizontally scalable, MySQL compatible - Morgan Tocker , TiDB talk at FOSDEM TiDB promises (and delivers) on both these goals: A

Building a SaaS based architecture on a budget without vendor lock-in

Building a SaaS based architecture on a budget without vendor lock-in

Opinionated account on a micro SaaS currently processing ~53k api requests daily and ~£3k monthly. Actual code, real lessons learnt the hard way. I wrote about SaaS based architectures earlier in 2020 which goes into detail on the tradeoffs around multi tenancy. We reject: kings, presidents and voting.We believe

A brief look at OpenAFS

A brief look at OpenAFS

I have a keen interest in opensource history and trying to understand which technologies hyperscalers may be using, or at least the technologies which came before them- the influences. With EFS (Another Web Service), I couldn't help but feel maybe there maybe similarities with other open file systems and was

How to create your own pip package example python

How to create your own pip package example python

Example code repo for post [https://github.com/KarmaComputing/create-your-own-python-pip-package] Being able to package your python project into a pip package is useful for distribution, and sharing with others especially if the code is generic enough to be useful in other projects). This repo is base on the tutorial: from

Docker tail -f from the end

Docker tail -f from the end

The docker way: docker logs -f --tail 10 container_name The host way $(docker inspect --format='{{.LogPath}}' # Then tail -f the file Ref * https://stackoverflow.com/questions/42510002/docker-how-to-clear-the-logs-properly-for-a-docker-container * https://stackoverflow.com/questions/52119832/how-to-tail-a-docker-log-from-the-current-position-in-the-log-without-seeing-the

Rust create ubuntu / debian package from cargo

Rust create ubuntu / debian package from cargo

Rust how to create a deb package with cargo deb

How to get started with rust

How to get started with rust

How to I install rust? See https://www.rust-lang.org/tools/install Or run: curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh How do I compile a rust program? Use rustc E.g. rustc main.rs The output is a binary main. Where does rust/cargo

Playwright tutorial example configuration

Playwright tutorial example configuration

Playwright provides a fast and reliable interface that can be used to automate browser navigation testing. In this Playwirght tutorial, we are going to use it to do some simple automated test and errors you might experience in the process. See the following Github repository: GitHub - KarmaComputing/playwright-testingContribute to

Debug python containers pdb docker breakpoint

Debug python containers pdb docker breakpoint

Debugging python docker containers with remote-pdb, docker-compose You want to debug and set breakpoints inside your docker container and/or you want to debug with docker-compose. > Warning: As the docs say: The debug host in your Docker container must be set to 0.0.0.0 (localhost or 127.0.

Does git rm delete the file?

Does git rm delete the file?

tldr; Yes. Yes it does. (use git restore --staged to un-delete if you made that mistake*) Does git rm remove the file? How to find out yourself: See man git rm or read on. Sometimes you find git is tracking files (e.g. binary files like images) which you shouldn't

Database migrations with multiple git branches and teams alembic sqlalchemy

Database migrations with multiple git branches and teams alembic sqlalchemy

> This article is suitable for understanding database migrations when there are database migrations on different git branches which need to be merged. The examples are python's alembic [https://alembic.sqlalchemy.org/en/latest/] project but the concept is useful for all When doing branch based development (e.g. issue branches)

How to Migrate From Ghost 1.x.x to 3.x.x

How to Migrate From Ghost 1.x.x to 3.x.x

The Ghost Version 1.x.x can't be updated automatically anymore. Therefore, it needs to install the lastest version of Ghost and migrate all the old data to the new Version to keep getting updates. This tutorial will help to achieve this 1. Make a Backup Always take a backup

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