TL;DR Every "my cluster has no IPs left" ticket is one of four address pools filling up: the node subnet, the pod addresses, the service CIDR, or the load-balancer pool. Which pool fills first depends on the platform: on EKS pods take VPC addresses (an m5.2xlarge holds 60), on GKE every node reserves a Pod …

TL;DR The tool: Kubernetes IP Calculator. Pick EKS, GKE or AKS, the instance type or pods per node, the node count and the zones; get max pods per node, the addresses every node takes, the subnet per zone and the pod and service ranges. Free, one HTML file, nothing leaves your browser. EKS numbers that matter: an …

You have just installed a Kubernetes cluster - with kubeadm, with Kubespray, on a fresh EC2 instance - you type kubectl get nodes, and instead of your nodes you get - 1$ kubectl get nodes 2The connection to the server localhost:8080 was refused - did you specify the right host or port? Nothing is listening on …

Note - This Kubernetes Cheat sheet is really long and detailed. I would highly recommend to use CTRL+F from the browser to search for the specific command. Table Of Content Pods Deployments Port Forwarding Service Nodes Namespace Service Accounts Documentation Describing Resources Editing Resources Deleting Resources …

The deletion of the Kubernetes POD depends on many factors, before you execute the kubectl delete pod command you should go through the following checkpoint - Is the container associated with POD still running? Are there any active Kubernetes deployment associated with POD? Check if the POD persistent volume and …

The deletion of PV(Persistent Volume) and PVC(Persistent Volume claim) is pretty much dependent on the Delete reclaim policy. When you are planning to delete the Persistent Volume as well as Persistent Volume Claim then you must follow an order - First delete - Persistent Volume Claim Second delete- Persistent Volume …

Kubernetes secrets are API objects which can only be referenced by POD, so if you are working in multiple namespaces then you can not share the same kubernetes secrets. Although it is possible to copy the same kubernetes into the desired namespace. Create kubernetes namespace testns1 In this blog post we are going to …

Before we jump onto kubernetes secrets let’s first try to understand What is Secret? - Secret is sensitive information which can not be written in a plain text or shared with others. The best example of Secrets would be the password. But Why do we need to use Kubernetes Secret? - Running a bare minimum kubernetes …

Working with Kubernetes is fun when your Kubernetes cluster is up and your nodes are working as you expected. But as a DevOps enthusiast who follows the principles of Continuous Integration and Continuous Delivery, you are aware that new changes or feature requests are always coming through the Jenkins Pipeline, and …

TL;DR One pod: kubectl delete pod NAME -n NAMESPACE. If a Deployment owns it, the ReplicaSet creates a replacement within seconds; in my run the delete took 2.3 seconds and the new pod was Running 5 seconds later. All pods in a namespace: kubectl delete pods --all -n NAMESPACE. Owned pods come back, bare pods are gone …