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Sysadmin

A collection of 37 posts

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

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

Using systemd-nspawn containers with publicly routable ips (IPv6 and IPv4) via bridged mode for high density testing whilst balancing tenant isolation

Using systemd-nspawn containers with publicly routable ips (IPv6 and IPv4) via bridged mode for high density testing whilst balancing tenant isolation

If you're tight for time and want to build this right away see the "Tutorial" heading for how to setup systemd-nspawn with bridge mode and public ip addressing. There's also an accompanying systemd-nspawn repo with a scripted process to deploy everything in this article automatically: GitHub - KarmaComputing/nspawn-systemd-nspawn-containersContribute to

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 can a process run with or without a tty, what's the difference?

thinking fast and slow

How can a process run with or without a tty, what's the difference?

A process can be associated with or run in the context of a TTY, which provides a text-based interface for the process. This means that the process will be able to read input from the TTY and write output to it. A process that is running without a TTY, on

How to set ulimit max number open files and other limits? Help!

How to set ulimit max number open files and other limits? Help!

> You can use this reference to learn how to update any of the kernel / userspace limits. Increase max number of open files nofile ubuntu (and other os's) > Fun fact: fs.file-max is probably not what you want to change, you probably want to change ulimit. But why? The deault fs.

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

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

Shrink existing partition mdraid linux ext4 using resize2fs

Shrink existing partition mdraid linux ext4 using resize2fs

How do I know what filesystem type it is? df -T How do I view the current disk(s) layout? lsblk -f 1. unmount the drive's partition you want to shrink umount /dev/md3 If you see umount: : target is busy. then you may need to cd out of the

Override the entrypoint of docker containers (any container)

Override the entrypoint of docker containers (any container)

Sometimes you want a quick and easy way to look inside a container before it's stopped- to debug it, to see what's going on. One way to change a way the image's container starts: docker run --rm --env-file .env --entrypoint="/bin/sleep" 120 #Example docker run --rm --env-file .env --entrypoint=

Why do I need to confirm my WHOIS information?

Why do I need to confirm my WHOIS information?

The WHOIS information shows the public and your registrant the contact information of a domain's owner; in other words, the WHOIS information can be useful to verify if a legit company or person created a Domain. However, some registrants have the option to hide the WHOIS information to the public

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

Saas based architectures

Saas based architectures

Deploy Sass customers independently each within their own version of the application or as one, application containing all tenants? The trade-offs when building software as a service (saas) based architectures, especially within the context of open source software. There's a lot of resources out there about building scalable architectures. Horizontal

Sessions not set SameSite cookie Firefox vs Chome iframe

Sessions not set SameSite cookie Firefox vs Chome iframe

This matter comes into play when you are embedding an iframe into your application (e.g. maybe your application is a SasS or you have a single sign on scenario), and you need to allow the embedded iframe to set cookies. tldr: https://twitter.com/rowan_m/status/1279013752520740865 I

FastAPI Production Deployment with Github actions & Dokku

FastAPI Production Deployment with Github actions & Dokku

This FastAPI tutorial shows you how to develop and deploy python FastAPI to a server with automated deployment & TLS using Github Actions. Based on this FastAPI deployment example repo. * Auto generated API Docs: OpenAPI & Redoc * Github actions deployment pipeline: Actions Workflow * Automated TLS certificate creation & renewal * Deployment to live url

htaccess redirect old pages to new domain

htaccess redirect old pages to new domain

Sometimes you need to change a domain name, and you want to redirect all old pages to the new domain name. On your existing domain, you can redirect all requests to the new domain with something like the following: In your .htaccess file: RewriteEngine On RewriteBase

Installing Jenkins x with existing git repo

Installing Jenkins x with existing git repo

How to install jenkinsx and import an existing git repo for your CI/CD pipelines development process. Enable faster teams and faster releases.

Kubernetes updating many deployments at once

Kubernetes updating many deployments at once

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Scaling Kubernetes ReadWriteMany Ceph Deployments

Scaling Kubernetes ReadWriteMany Ceph Deployments

Run ReadWriteMany volumes on Google Kubernetes engine which allows your Deployments with persistent data to scale. This allows us to scale a Kubernetes deployment with Persistent Volumes without the deployment getting stuck waiting for a realease on a volume. This tutotial has a repo which has been pinned as a

Kubernetes SSL Certificates- How to Set-up a Cluster With SSL Termination

Kubernetes SSL Certificates- How to Set-up a Cluster With SSL Termination

Using Cert Manager on a Kubernetes cluster to do SSL termination. By the end of this guide you will be able to: * Route SSL traffic from a domain your own (example.com) to a kubernetes cluster * Understand how to add additional domains to your cluster * Certificate renewal is automatic, handled

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