Kubernetes interview questions and answers
1.What is Kubernetes?
Answer: Kubernetes is an open-source container
orchestration platform that automates the deployment, scaling, and management
of containerized applications.
2.What is a Pod in Kubernetes?
Answer: A Pod is the smallest and most basic unit in
Kubernetes. It represents a single instance of a running process in a cluster
and can contain one or more containers.
3.What is a Deployment in Kubernetes?
Answer: A Deployment in Kubernetes is an object that
manages the deployment and scaling of a set of Pods. It provides declarative
updates and rollbacks for application deployments.
4.What is a Service in Kubernetes?
Answer: A Service in Kubernetes is an abstract way to
expose an application running on a set of Pods. It provides a stable network
endpoint to access the Pods and enables load balancing and service discovery.
5.What is a ReplicaSet in Kubernetes?
Answer: A ReplicaSet in Kubernetes ensures that a
specified number of Pod replicas are running at all times. It is responsible
for scaling and maintaining the desired number of Pods.
6.How do you scale a Deployment in Kubernetes?
Answer: You can scale a Deployment in Kubernetes by
updating the replicas field in the Deployment manifest using the kubectl scale
command or by editing the Deployment directly using kubectl edit deployment.
7.What is a Namespace in Kubernetes?
Answer: A Namespace in Kubernetes is a virtual
cluster that provides a way to partition resources within a cluster. It allows
different teams or projects to have their own isolated environments.
8.How do you upgrade a Kubernetes cluster?
Answer: Upgrading a Kubernetes cluster involves
updating the Kubernetes control plane components and worker nodes. The process
may vary depending on the specific Kubernetes distribution or deployment method
being used.
9.What is the role of a ConfigMap in Kubernetes?
Answer: A ConfigMap in Kubernetes is used to store
non-confidential configuration data as key-value pairs. It provides a way to
decouple configuration from application code and allows for easier management
and modification of configurations.
10.What is the role of a Secret in Kubernetes?
Answer: A Secret in Kubernetes is used to store
sensitive information, such as API keys, passwords, or TLS certificates.
Secrets are encrypted and can be used to securely provide confidential data to
Pods.
11.What is the purpose of an Ingress in Kubernetes?
Answer: An Ingress in Kubernetes is an API object
that manages external access to services within a cluster. It provides a way to
route and control incoming traffic to different services based on hostnames,
paths, or other rules.
12.What is the difference between a StatefulSet and a
Deployment in Kubernetes?
Answer: A Deployment is used for stateless
applications, while a StatefulSet is used for stateful applications that
require stable network identities and persistent storage. StatefulSets manage
the deployment and scaling of Pods with unique identities.
13.What is a DaemonSet in Kubernetes?
Answer: A DaemonSet in Kubernetes ensures that all or
some nodes in a cluster run a copy of a specific Pod. It is useful for
deploying system daemons or agents that need to run on every node.
14.How do you monitor a Kubernetes cluster?
Answer: Kubernetes provides various ways to monitor a
cluster, such as using tools like Prometheus and Grafana for cluster-level
monitoring and metrics. Additionally, you can use the Kubernetes API and
logging tools to gather information about Pods, services, and events.
15.How do you handle rolling updates in Kubernetes?
Answer: Rolling updates in Kubernetes are handled by
updating the Deployment or StatefulSet manifest with the new image or
configuration. Kubernetes will automatically manage the rolling update process,
ensuring that Pods are updated without downtime.
16.What is a liveness probe in Kubernetes?
Answer: A liveness probe in Kubernetes is a mechanism
to determine if a container is running and healthy. It periodically sends
requests to the container and restarts it if the probe fails.
17.What is a readiness probe in Kubernetes?
Answer: A readiness probe in Kubernetes is used to
determine if a container is ready to receive traffic. It ensures that the
container is fully initialized and able to handle requests before it is added
to the load balancer.
18.How do you perform a blue-green deployment in
Kubernetes?
Answer: A blue-green deployment in Kubernetes
involves creating two identical environments (blue and green), deploying the
new version to the green environment, and then switching traffic from the blue
to the green environment.
19.What is the role of a PersistentVolume in Kubernetes?
Answer: A PersistentVolume in Kubernetes is a storage
abstraction that provides a way to manage durable storage in a cluster. It
allows Pod data to persist across container restarts and enables data sharing
between Pods.
20.How do you debug a Pod in Kubernetes?
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