Stories Tag: controller

Build Kubernetes Controller to Provision PVC using Kubebuilder | by Sonu Singh | Sep, 2021 | Medium

admin 1 month ago in

A controller tracks at least one Kubernetes resource type. These objects have a spec field that represents the desired state. The controller(s) for that resource is responsible for making the current state come closer to that desired state. If you want more details about Kubernetes controller check this link:[https://kubernetes.io/docs/concepts/architecture/controller/] In this demo, we are going to create a controller to watch Pods event and if…

Kubernetes operator best practices: Implementing observedGeneration | by Alena Varkockova | Feb, 2021 | Medium

admin 9 months ago in

There’s a lot of hidden knowledge in core controllers and api conventions doc that is not followed by many controllers in the wild. One of these patterns is observedGeneration. Let’s take a closer look at what problems it can help solve. Kubernetes resources typically enforce spec and status separation. That means that the desired state (‘spec’ part of the object) and status (‘status’ part of…

Writing Kubernetes Sample Controller in Java | by Rohan Kumar | Feb, 2021 | Medium

admin 9 months ago in

I recently saw this Sample Controller repository on kubernetes Github repository. This just implements a simple controller for watching CustomResource named Foo as defined within a CustomResourceDefinition. I thought it would be a good idea to port this example which is written in GoLang to Java using Fabric8 Kubernetes Client to get an idea of doing these operations but in Java: If you’re not familiar…

CassKop 1.0.1: Backup and restore | by Cyril Scetbon | Nov, 2020 | Medium

admin 11 months ago in

A big milestone was achieved with this feature and we thought it deserved to bump our version to 1.0. In this release we collaborated with Instaclustr to add the ability to do backups and restores on cassandra clusters deployed by CassKop. Intaclustr Icarus, the sidecar that CassKop deploys along the Cassandra nodes to trigger backups and restores, uses Instaclustr Esop which does the actual operations….

Build your own platform on Kubernetes | by Ashish K Thakur | Sep, 2020 | Medium

admin 1 year ago in

You can configure a service traffic to be routed 10% towards version 1.0 and 90% towards version 2.0 of an application in Istio by as simple a definition as below. A task to clone a repository can be specified in Tekton by applying the following yaml. Let’s see how Tekton, Knative, Istio etc extend K8s. The above yamls represent VirtualService and Task custom resources. The…

Enable AWS Shield to your ingress using aws-shield-controller | by Joonas Lehtimäki | Sep, 2020 | Medium

admin 1 year ago in

AWS Shield provides an extra layer of security for your AWS Loadbalancers with its DDoS protection. Currently, only alb-ingress-controller offers the ability to enable AWS Shield easily within your Kubernetes cluster. AWS Shield controller tries to tackle this problem. In a scenario where you have a web application running in your EKS cluster, and you are using ingress-controller like Nginx, you may want to consider…

Develop Kubernetes native applications in Golang with autorecompile | by Boban Acimovic | Aug, 2020 | Medium

admin 1 year ago in

Do you develop or plan to develop a Kubernetes native application in Golang, controller or operator? Such application strongly depends on being inside Kubernetes and development outside of Kubernetes may be a real hassle. Usually you have to build an image over and over again and restart the pod (with imagePullPolicy set to Always). This is very boring and time consuming procedure. Two years ago…