9 Kubernetes interview questions and answers.

Here are 9 Kubernetes interview questions and answers that may be most helpful for you in a Kubernetes interview in 2023:

1. What is Kubernetes and why is it used? Kubernetes is an open-source container orchestration platform that allows you to deploy, scale, and manage containerized applications. It is used to automate the deployment, scaling, and management of containerized applications.

2. What are the key components of a Kubernetes cluster? The key components of a Kubernetes cluster include the following:

• Masters: These are the servers that control the cluster and provide the Kubernetes API.

• Nodes: These are the servers that run the containerized applications.

• etcd: This is a distributed key-value store that stores the cluster's configuration.

• kube-apiserver: This is the main component of the master that exposes the Kubernetes API.

• kube-scheduler: This component assigns pods to nodes in the cluster.

• kube-controller-manager: This component is responsible for various cluster-level processes, such as replicating pods and maintaining the desired state of the cluster.

1. What are pods in Kubernetes? Pods are the smallest deployable units in Kubernetes. They are a logical host for one or more containers, and they provide shared storage, networking, and lifecycle management for the containers.

2. What are the main features of Kubernetes? The main features of Kubernetes include:

• Container orchestration: Kubernetes can deploy, scale, and manage containerized applications.

• Self-healing: Kubernetes can automatically restart failed containers or replace unhealthy ones.

• Horizontal scaling: Kubernetes can scale up or down the number of replicas of a containerized application based on resource usage.

• Load balancing: Kubernetes can distribute incoming traffic to multiple replicas of a containerized application.

1. How does Kubernetes ensure high availability of applications? Kubernetes ensures high availability of applications by replicating them across multiple nodes in the cluster. If a node fails, the pods running on that node will be automatically rescheduled on other healthy nodes, ensuring that the application remains available.

2. How does Kubernetes handle rolling updates and rollbacks? Kubernetes provides the kubectl rolling-update command to perform rolling updates of applications. This allows you to update the application one pod at a time, ensuring that there is minimal downtime. If an update fails, Kubernetes can automatically roll back the update to the previous version.

3. How does Kubernetes handle storage? Kubernetes supports various types of storage, including local storage, network-attached storage, and cloud-based storage. It provides the PersistentVolume and PersistentVolumeClaim resources to manage storage in the cluster.

4. What are namespaces in Kubernetes? Namespaces are virtual clusters within a physical cluster in Kubernetes. They allow you to partition resources in the cluster and provide a way to divide cluster resources between multiple users.

5. What are labels and annotations in Kubernetes? Labels are metadata that can be attached to Kubernetes resources such as pods, nodes, and services. They are used to identify and organize resources in the cluster. Annotations are similar to labels, but they are used to store non-identifying metadata about resources.