The ramblings of a computer geek
Kubernetes is a container orchestration platform, it allows you to run many containerised workloads (applications) in a scalable, secure, reliable and adaptable way. It is however quite complex to build and manage. To explore a Kubernetes deployment we are going to be using Kubespray to deploy and manage a Kubernetes cluster which is built upon … Read more
In part 4 of the series we are exploring Metrics. Although we’ll go into more detail later on in the series. Kubernetes can collect metrics of attributes like CPU or Memory etc. These metrics are collected by a Metrics Server, you can use the built in Kubernetes one (Metrics Server), or you can use external … Read more
Minikube is a great way to play with Kubernetes clusters in a quick way. But what if you want to have multiple Kubernetes clusters to play around with? You can use Minikube to start multiple clusters and then switch between them. Create Two Clusters Let’s create two clusters, we’re also going to be setting the … Read more
I was using Minikube and had created some users with some certificates (see a previous article), however upon trying to login the following day and attempt to perform some commands I got this error: When running a “get pods”, I see I’m not actually authenticated! Hunting the Issue Looking under the Minikube logs, and specifically … Read more
We’ll create user called “dave” to use within a Kubernetes cluster, I’m using Minikube in this case. Create Private Key Create the private key: Create and Sign the CSR Now create the Certificate Signing Request (CSR): Now on this the subject is important. Here you are defining their username (CN), “dave” in this case, and … Read more
https://microk8s.io/docs/registry-images So images. A container is based on an image. You can pull these images in from the outside world, e.g. from a Public, Private registry, or from the built-in registry. For this copy the “hello-python” directory we created in Part 2 into one called “hello-python3”, you can delete the .tar file in there for … Read more
Well Part 2 was very long, so lets have a shorter one and cover how you can adjust your application on the fly and add the other worker nodes to the cluster. Updating an Application or Service on the Fly Kubernetes is a system whereby you declare what you want the “world” to look like, … Read more
Log onto your master node via SSH. We’re going to build an image and then deploy it, so as a developer you’d probably be developing on your own machine possibly running docker locally to test how your containers work before deploying the code to a repository where it can then be applied to a production … Read more
Kuberntes is a platform for the managing of containerised workloads and services, that is akin to a declarative infrastructure as code type platform. It allows developers to deploy containerised applications quickly and easily and in such a way that infrastructure system administrators can manage the infrastructure for the applications to be as adaptable and flexible … Read more