1. What is Kubernetes, and why is it important for container orchestration?
Kubernetes is an open-source platform that automates how we deploy, manage, and scale containerized applications. Containers make our software portable and easier to manage. Kubernetes is important because it handles the complexities of:
- Resource Distribution: Assigning computing power and memory where it’s needed.
- Self-Healing: Restarting failed containers and replacing unhealthy ones.
- Scaling: Easily increasing or decreasing the number of application instances based on demand.
2. Explain the concept of a Kubernetes pod.
A pod is the smallest unit of deployment in Kubernetes. It’s like a wrapper that holds one or more tightly coupled containers that need to share resources and communicate with each other. Think of it as a “house” for your containers.
3. How does Kubernetes handle container scaling?
Kubernetes offers ways to scale your applications:
- Manually: You can directly tell Kubernetes how many copies (replicas) of your application you want.
- Automatically: Kubernetes can monitor things like CPU usage, and automatically add or remove replicas to match the workload you need.
4. What is a Kubernetes service, and why is it useful?
A Kubernetes service provides a stable way to access a set of pods, even if those individual pods are created and destroyed. Think of it like a phone number for your application—pods might change, but the service gives you a reliable way to reach your application. Services are useful for:
- Internal Communication: Allowing different parts of your application to talk to each other.
- External Access: Making your application accessible from outside the Kubernetes cluster.
5. Describe the role of a Kubernetes controller.
Controllers are like managers in Kubernetes. They watch the current state of your cluster and compare it to your desired state (what you’ve defined). If there’s a difference, the controller takes steps to fix it. For example:
- Replication Controller: Makes sure the right number of pod replicas are running.
- Deployment Controller: Handles rolling out updates to your applications with minimal downtime.
Part 2- Kubernetes Interview Q & A (Q6-Q10)
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