Linux, Networking, Container, and Monitoring Interview Questions

Linux and Networking

Find all txt files under the /temp directory that start with "test" and replace the string "aaa" with "bbb".

Explain what the CPU fields us , sy , id , wa , and st represent in the output of the top command.

Describe the differences between soft (symbolic) links and hard links.

Summarize the three‑way handshake process of TCP.

Explain the differences between processes and threads.

Compare the TCP and UDP protocols and highlight their main distinctions.

Define a DDoS attack and list common mitigation strategies.

Outline how Keepalived works.

Describe how the TIME_WAIT state is generated and discuss possible optimization methods.

Container Technology

List the networking modes available in Docker.

Identify the main components of Kubernetes (K8s) and their respective purposes.

Explain why Kubernetes uses Pods instead of directly managing individual containers and the benefits this brings.

Differentiate between Deployment and StatefulSet in Kubernetes.

Explain affinity scheduling and anti‑affinity scheduling in Kubernetes.

Monitoring System

Discuss the purpose of monitoring and what it aims to achieve.

Enumerate the main components of Prometheus.

Describe the role of Prometheus exporters and mention some commonly used exporters.

Explain how to monitor an HTTP service with Prometheus.

State whether Prometheus supports high‑availability deployment and outline how to achieve it.

Website Operations

Identify the typical causes of HTTP 401, 404, and 503 errors.

Define what a gray‑release (canary release) is in website deployment.

Explain the concept of a reverse proxy.

List the advantages of using Nginx.

Provide a step‑by‑step troubleshooting approach when a website loads slowly.

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