Kubernetes Interviews: Essential Questions and Answers — Part 1
Ace your Kubernetes interviews with this comprehensive list of essential questions and expert answers
- What is Kubernetes?
Answer: Kubernetes is an open-source container orchestration platform that automates the deployment, scaling, and management of containerized applications.
Explanation: It enables the deployment of complex, microservices-based applications and manages the container lifecycle from creation to termination. Kubernetes provides features like service discovery, load balancing, storage orchestration, and automatic rollouts and rollbacks.
2. What is a Pod in Kubernetes?
Answer: A Pod is the smallest deployable unit in Kubernetes, representing a single instance of an application.
Explanation: It can contain one or more containers that share the same network namespace, storage volumes, and other resources. Pods are designed to be ephemeral, meaning they can be created, deleted, and replaced dynamically. Pods are typically created and managed by higher-level abstractions like Deployments, StatefulSets, or Jobs.
3. What is a Deployment in Kubernetes?
Answer: A Deployment is a higher-level abstraction that manages the deployment of multiple Pods and ensures a specified number of replica Pods are running at any given time.
Explanation: A Deployment in Kubernetes is a higher-level abstraction that manages the deployment of multiple Pods. It ensures that a specified number of replica Pods are running at any given time and allows for rolling updates and rollbacks. Deployments provide a declarative way to manage the state of applications and ensure consistency across environments.
4. What is a Service in Kubernetes?
Answer: A Service is an abstraction that defines a logical set of Pods and a policy by which to access them.
Explanation: Services enable communication between different parts of an application and provide load balancing and service discovery. They ensure that Pods are discoverable and accessible from other parts of the application, even if they are running on different nodes or have dynamic IP addresses.
5. What is a Kubernetes namespace?
Answer: A Kubernetes namespace is a virtual cluster within a Kubernetes cluster that provides a way to partition and isolate resources within a cluster.
Explanation: It provides a way to partition and isolates resources within a cluster, allowing multiple teams or applications to share the same physical infrastructure. Namespaces provide a way to organize and manage resources based on their logical grouping and enable role-based access control and resource quotas.
6. What is a Kubernetes controller?
Answer: A Kubernetes controller is a core component of Kubernetes that manages the state of a cluster and ensures the desired state is maintained.
Explanation: A Kubernetes controller is a core component of Kubernetes that manages the state of a cluster. It monitors resources in the cluster and ensures that the desired state is maintained, reconciling any discrepancies that arise. Controllers provide a declarative way to manage resources and ensure consistency across the cluster. Examples of controllers include Deployments, ReplicaSets, StatefulSets, and Jobs.
7. What is a StatefulSet in Kubernetes?
Answer: A StatefulSet is a higher-level abstraction that manages the deployment of stateful applications, such as databases.
Explanation: It ensures that each instance has a stable and unique hostname, persistent storage, and ordered deployment and scaling. StatefulSets provide a way to manage stateful applications in a declarative and consistent manner, enabling applications to be scaled up or down dynamically.
8. What is a ConfigMap in Kubernetes?
Answer: A ConfigMap in Kubernetes is a configuration store that allows you to decouple configuration data from your application code.
Explanation: It provides a way to store key-value pairs, files, or command-line arguments that your application needs to run. ConfigMaps are typically used to store configuration data that is likely to change, such as database connection strings or environment variables. They enable you to manage configuration data separately from the application code, making it easier to update and maintain.
9. What is a Secret in Kubernetes?
Answer: A Secret in Kubernetes is a way to store and manage sensitive information, such as passwords or tokens.
Explanation: It provides a secure way to store and distribute sensitive data to your application without exposing it to other parts of the system. Secrets are typically used to store credentials, TLS certificates, or other sensitive information that your application needs to function. They are encrypted at rest and can be mounted as files or environment variables in your application containers.
10. What is the difference between a DaemonSet and a Deployment in Kubernetes?
Answer: A DaemonSet in Kubernetes ensures that a Pod is running on all nodes in a cluster, while a Deployment manages the deployment of multiple Pods and ensures a specified number of replica Pods are running at any given time.
Explanation: It is typically used to run a single instance of a daemon process, such as a logging agent or a monitoring agent, on each node in the cluster. A Deployment, on the other hand, manages the deployment of multiple Pods and ensures a specified number of replica Pods are running at any given time. It is typically used to manage stateless applications, such as web servers or microservices, that can be scaled horizontally.
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Part — 2
