SquareOps Technologies Devops Engineer Interview Questions and Answers

Kubernetes core components include Pods, Nodes, Services, Deployments, and ConfigMaps.

• Pods: Smallest deployable units in Kubernetes, can contain one or more containers.

• Nodes: Individual machines in a Kubernetes cluster where Pods are deployed.

• Services: Abstraction that defines a logical set of Pods and a policy by which to access them.

• Deployments: Manages the deployment and scaling of a set of Pods.

• ConfigMaps: Decouple...read more

Scaling applications in Kubernetes involves horizontal scaling, using tools like HPA and cluster autoscaler.

• Use Horizontal Pod Autoscaler (HPA) to automatically adjust the number of pods based on CPU or memory usage.

• Implement Cluster Autoscaler to dynamically adjust the size of the Kubernetes cluster based on resource demands.

• Utilize Kubernetes StatefulSets for stateful applications that require scaling with stable net...read more

HPA is Horizontal Pod Autoscaler for scaling pods based on CPU utilization, while VPA is Vertical Pod Autoscaler for adjusting resource requests based on resource usage.

• HPA scales the number of pods in a deployment based on CPU utilization, ensuring optimal performance and resource utilization.

• VPA adjusts the resource requests of pods based on resource usage, allowing for efficient resource allocation within a cluster.

• ...read more

In case the master goes down in a Kubernetes cluster, the deployed workload continues to run as the worker nodes are still operational.

• The worker nodes in the Kubernetes cluster continue to operate and manage the deployed workload even if the master node goes down.

• The worker nodes are responsible for running the containers and maintaining the desired state of the cluster.

• The master node being down may affect the abilit...read more

Individual components of a Kubernetes cluster have different functionalities such as scheduling, networking, storage, and monitoring.

• Kubelet: Responsible for communication between the master node and worker nodes, managing containers on the node.

• Kube-proxy: Manages network routing for services within the cluster.

• Kube-controller-manager: Ensures that the desired state of the cluster matches the actual state.

• Etcd: Key-va...read more