Kubernetes Archives - Page 6 of 11

Learn the Importance of Namespace, Quota & Limits

Let’s start with a scenario, whenever any application builds, we generally do have 3 environments on the basis of resources – dev for developers resources, test for testers resources, and prod for production resources. Likewise, we used to have a separate IT-Operational Team having strategies to maintain their environment resources. It was very time-consuming and many human resources were required.

We are in the microservices era where we follow the DevOps Methodology. The DevOps Team brings all the environment and strategies to maintain resources in one go. Resources are the ones who decide the behavior of your applications. We can apply the criteria to resources, so how can our application behave? To do this we can give the name to our resources, we can give the resources quota to the application, and can give resource ranges to the application.

Continue reading “Learn the Importance of Namespace, Quota & Limits”

A Savior – Imperative in K8s

There are two basic ways to deploy to Kubernetes: Imperative acts as a command which is active and immediate, whereas declarative is passive, by writing manifest file and using kubectl apply.

Why Imperative?

The imperative command is the first mode of managing objects, to use CLI for CUD (Create, Update, Delete) objects on Kubernetes cluster without specifying on manifest file ahead of time. They are a blessing for Kubernetes application developers and administrators because they are very easy to remember and handy. According to K8s, it’s like a ‘Swiss Army Knife” of container orchestration and management.

Imperative commands can help in getting tasks done quickly, as well as generating definition file templates easily. It saves a considerable amount of time and prevents human errors.

Know the Role of K8S Service Account in Granting Access

Have you ever wondered that when you access the API Server through kubectl you are authenticated through the API controller, but how will you do the same from the pod side? Here the Service Account role comes into play. As k8s definition itself says “Processes in containers inside pods can also contact the apiserver. When they do, they are authenticated as a particular Service Account (for example, default).”

Things we should know about service Account,

Created in a namespace.
Used to allow processes inside pods, access to the API Server.
Default service account = default (no access to the API server).
Create your own service account.
- Use it in a RoleBinding or ClusterRoleBinding.
- Use the service account secret to obtain the authentication token & CA certificate.

What we will be covering today,

Creating a pod (that gets automatically created in default Service Account)
Will create a Service Account
Creating a deployment that will be using appsa Service Account.
RBAC

Know How to Use Velero to Backup and Migrate Kubernetes Resources and Persistent Volumes

Introduction

“Murphy’s law doesn’t mean that something bad will happen. It means that whatever can happen, will happen.” This is something related to destiny but we should not totally rely upon it and should be prepared for the worst.
The same philosophy referenced above applies to the tech world too. That’s the reason we should be prepared with our backup options choices possibly, a data set or Kubernetes cluster.

“Always be ready with backup options like Velero for Kubernetes.” Continue reading “Know How to Use Velero to Backup and Migrate Kubernetes Resources and Persistent Volumes”

Records Creation in Azure DNS from AKS ExternalDNS

Have you ever thought to create the DNS records automatically (like: A record, AAAA record and TXT record etc.) in the DNS Zones of Azure cloud from the kubernetes cluster’s yaml manifests (to be specific the External DNS) ?

NO ?

So don’t worry guys because i have done it and i thought i should share this experience with you guys. This is not limited to Azure cloud DNS Zones, It will work with AWS Route 53, Google cloud DNS, AWS cloud map and many more to mention here.

Now let me introduce you guys to the particular objects of this setup then next we will move forward to know How to setup these objects.

So let’s go………….