Story Tag: operators

Stories Tag: operators

OpenShift 4.x Upgrade….. This blog aims to help cluster… | by Kamlesh Prajapati | Oct, 2021 | Medium

admin 5 days ago in

This blog aims to help cluster administrators plan out their upgrades to their OpenShift fleet and communicate best practices to control OpenShift’s automated operations. OpenShift 4.x has the following features When you combine the goals outlined for no downtime for your apps, and all of the automation baked into the Operators, the upgrade experience boils down to a single button. Cluster admins have the ability…

Openshift Container Platform içerisinde kendi Sandbox ortamınızı oluşturun | by Emre Özkan ☁️ 🐧 🐳 ☸️ | Devops Türkiye☁️ 🐧...

admin 1 week ago in

Openshift Sandbox Containers , Openshift 4.9 versiyonunda Technology Preview olarak sunulan bir özellik olarak karşımıza çıkıyor. Altyapısında 2017 yılında duyurulan bir açık kaynak bir proje olan Kata Containers bulunmaktadır. Open Infrastructure Foundation tarafından geliştirilen KataContainers ,sanal makinelerin (VM) güvenlik avantajlarını, konteynerlerin hızı ve yönetilebilirliği ile birleştirmeyi amaçlamaktadır. Normal Konteyner’lardan farkını mimari olarak açıklamak gerekirse: Geleneksel Konteyner’ları , ortak bir kernel kullanımı olan ve namespace’lerle yapılan…

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…

What is KUTTL?. The Kubernetes Test TooL [KUTTL]… | by Afee | Sep, 2021 | Medium

admin 1 month ago in

The Kubernetes Test TooL [KUTTL] provides a declarative approach to testing production-grade Kubernetes operators. To install KUTTL need krew, the package manager for kubectl plugins. The below command need to run for the directory where kuttl-test.yaml exist. Once you have successfully install KUTTL we can run tests. pod.yaml assert.yaml If the test was successful, you will see following output:

The basics of Kubernetes Operator | by Mandar Kulkarni | Aug, 2021 | Medium

admin 3 months ago in

Kubernetes is a very popular container orchestration platform for automatic deployment, scaling and management of web services. One of the key principles of Kubernetes Architecture is the Control loop or Controllers. Kubernetes Operators provide a way to extend Kubernetes Architecture by using the principal of Control loop. Let’s deep dive to understand more! Control loop in Kubernetes The declarative model of the Kubernetes APIs allows…

Limitations with current database operators in Kubernetes: StatefulSet (Part 3) | by Tesera | Jul, 2021 | Medium

admin 3 months ago in

As it was briefly mentioned in Part 2, the fragmentation of the database ecosystem in Kubernetes is in part due to the use of the StatefulSet. The StatefulSet is a workload API for stateful deployments. Nodes inside the set are identified with unique and ordered names (unlike ReplicaSets) such that in the event of updates or failures the pods can be recreated with the same…

ElasticSearch (Operator) and Graylog on Kubernetes | by Valerijs Zemlanikins | Apr, 2021 | Medium

admin 7 months ago in

ElasticSearch now looks like the standard solution for logging. Many companies want to use and install it. The main problem is that if you want to make your ElasticSearch system production-ready, you must have an ElasticSearch cluster. You have to maintain and configure master nodes and data nodes. You can find lots of manuals and pre-existing manifests for it, or use navigational diagrams, but you…

Getting Started to Write Your First Kubernetes Admission Webhook Part 1✨ | by Batuhan Apaydın | Trendyol Tech | Apr,...

admin 7 months ago in

Kubernetes Admission Controllers concept is very popular these days, especially dynamic ones: MutatingAdmissionWebhook and ValidatingAdmissionWebhook. 🌟 Before jump into the details of how we can write one of these, let’s explain a little bit about, what are they, what we can do with them. An admission controller is a piece of code that intercepts requests to the Kubernetes API server prior to the persistence of…

Kubernetes operators best practices: understanding conflict errors | by Alena Varkockova | Apr, 2021 | Medium

admin 7 months ago in

One of the most prevalent errors one encounters when developing an operator is ‘the object has been modified; please apply your changes to the latest version and try again’. Please raise your hand if you’ve seen this in your logs… Yeah, that’s what I thought 🙂 To understand why this is happening, it’s worth noting that API server uses an optimistic concurrency control to deal…