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What is Kubernetes? Kubernetes, also known as K8s, is an open-source container orchestration tool for automating the deployment, scaling, and management of containerized applications. Kubernetes Architecture In Kubernetes, we have MASTER NODE and W...
Manual Scheduling Every pod has a field named nodeName, which by default is not set. Kubernetes adds it automatically. The scheduler goes through all the pods and looks for those that do not have this property set. Those are the candidates for sche...
Metrics Server You can have one Metrics Server per Kubernetes cluster. The Metrics Server retrieves metrics from each of the Kubernetes nodes and pods, aggregates them, and stores them in memory. Metrics Server is only an in-memory monitoring solu...
Rolling Updates and Rollbacks Rollout and Versioning When you first create a deployment, it triggers a rollout. A new rollout creates a new deployment revision. In the future, when the application is upgraded, meaning when the container version is...
OS Upgrades Consider we have a cluster with few nodes and pods serving the applications on those nodes. What happens when one of the nodes goes down? The pods on them will not be accessible. If the node comes back immediately, then the kubelet p...
Container Storage Interface (CSI) In the past, Kubernetes used Docker alone as the container runtime engine, and all the code to work with Docker was embedded within the Kubernetes source code. With other container runtimes coming in, such as rkt, ...