Posts

  • Building your own affordable K8s to host a Service Mesh - Part 2: External DNS and Ingress

    In order to get an affordable Kubernetes, every part we’re going to use should be affordable too, and ones of the expensive and tricky things are the AWS Elastic Load Balancing (ELB) and the AWS Route 53 (DNS). Fortunately, Kubernetes SIGs are working to address this gap with the Kubernetes ExternalDNS.

    But what is the problem?

    Apart of it is expensive, the problem is every time I deploy a Service in Kubernetes I have to update and add a new DNS entry in the Cloud Provider’s DNS manually. Yes, of course, the process can be automated, but the idea is doing it during the provisioning time. In other words, every developer can publish theirs services adding the DNS name as annotation for that services can be called over Internet. Yes, Kubernetes brings by default a DNS but this is an internal one and it is only to work resolving DNS names over the Kubernetes Network, not for internet facing services.

    The Solution

    The Kubernetes ExternalDNS will run a program in our affordable K8s which it will synchronize exposed Kubernetes Services and Ingresses with the Cloud Provider’s DNS Service, in this case with AWS Route 53. Below you can view a high level diagram and current status of my Affordable Kubernetes Data Plane, I recommend look at first post about it.

    Service Mesh hosted using AWS Spot Instances

  • Building your own affordable K8s to host a Service Mesh Data Plane

    I want to build a Container-based Cloud to deploy any kind of workload (RESTful API, Microservices, Event-Driven, Functions, etc.) but it should be affordable, ready to use, reliable, secure and productionable. This means:

    • Productionable: should be fully functional and ready to be used as a production environment.
    • Reliable and Secure: able to improve the security level by implementing more security controls, at least fully isolated secure private networking.
    • Affordable: cheaper.
    • Ready to use: able to be automated (DevOps and IaC) with a mature management API.

    Below a high level architecture of Container-based Cloud I want to get. I will focus on the Service Mesh Data Plane.
    Service Mesh hosted in a Container-based Cloud

    These requeriments restric some options, all of them using any Public Cloud Provider, but considering the AWS Spot Instances and Google Cloud Preemptible VM Instances. Unfortunately Microsoft Azure only provides Low-Priority VMs to be used from Azure Batch Service. But if you are new user, you could apply for using the Free Tier in all of 3 Cloud Providers.

  • Migrating WordPress.com's blog to GitHub Pages with Jekyll - Part 2

    In the first blog post I explained how to export your WordPress.com blog and use it to generate your static blog site to be hosted in GitHub Pages. Now, in this blog post (Part 2) I will explain how to manage the look&feel, theme, layouts and pagination of a previous migrated WordPress.com’s blog to GitHub Pages. Also I’ll explain how to convert all HTML post files, obtained by using the JekyllImport::Importers::WordpressDotCom, to Markdown format by using a simple Python script.

    Migrating WordPress.com's blog to GitHub Pages by using Jekyll Part2

  • Setting a Python 3 local programming environment

    This post will guide you through installing Python 3, and Python 2.x, on your local Linux machine and setting up a programming environment via the command line. This post will explicitly cover the installation procedures for Ubuntu 18.04 or above, but the general principles apply to any other distribution of Debian Linux.

    Python 3

  • Android Tablet or iPad as extra monitor for Linux

    There are several applications out there that help us to use a spare Android Tablet or iPad as a external monitor in Windows PC or Mac OSX Laptop over WI-FI or using a USB cable. For example: