Top Linux Ops Interview Questions & Expert Answers for Your Next Job

Interview Experience Overview

The author unexpectedly received interview invitations after updating a résumé on a job portal and decides to share the Linux operations interview experience.

Job Description & Requirements

Job Description: Install, configure, optimize and maintain application servers. Backup, manage, maintain and analyze application logs. Monitor, maintain, troubleshoot, analyze performance and optimize applications. Develop, deploy, upgrade and maintain deployment, environment configuration and monitoring systems to build a high‑performance operations platform. Requirements: Familiar with Linux fundamentals and common commands. Proficient in configuring Nginx, HAProxy and related software. Understand networking basics and TCP/IP, able to configure switches/routers and analyze networks. Develop ops scripts using shell, Perl or Python. Experience with monitoring tools such as Nagios or Ganglia.

Key Interview Questions & Answers

1. Self‑introduction – Keep it concise (3‑4 minutes), focus on relevant work experience, technologies used, and avoid unrelated personal details.

2. How to implement gray‑release? – Explain purpose, user identification, target user selection strategy, data feedback (explicit and implicit), rollback strategy, and the need for PR/operations support.

3. MongoDB familiarity and deployment size – Deploy replica set or sharded cluster, typically 3‑5 nodes; describe the mongos router role that maps data to shards.

4. Release and rollback with Jenkins – Outline Jenkins pipeline: fetch code (SVN/Git), tag, compile if needed, push to release server, distribute to business servers; rollback by redeploying the previous version.

5. Tomcat working modes – Independent servlet container, in‑process servlet container, and external servlet container; requests may come from a front‑end web server (Apache, Nginx, IIS) or directly from a browser.

6. Monitoring solutions – Use Alibaba Cloud monitoring for cloud services; use Zabbix for IDC environments, installing agents on each host and leveraging built‑in templates.

7. Data backup strategy – Hot backup via master‑slave replication; cold backup using a dedicated backup server with rsync + inotify and scheduled tasks; also retain release packages on the release server.

Interview Tips

Know your résumé thoroughly; be able to discuss every listed skill.

Never pretend to know something you don’t; admit gaps honestly.

Review fundamentals and principles; interviewers often test concepts rather than specific configuration files.

After the interview, record all questions and research any unknown topics promptly.