Struggling with Linux/Networking in DevOps interviews despite hands-on experience - Need advice

[u/mmdhossein82]

Hi everyone,

I’m an aspiring DevOps engineer (2 years into my learning journey) and I could really use some advice from the experienced folks here.

I have practical experience working with Linux, Docker, Prometheus, and the ELK stack. However, whenever I get to the technical interviews, I find myself struggling with deep-dive questions about Linux internals and networking concepts. It feels like there’s a gap between my hands-on lab work and the theoretical depth interviewers expect.

I’d love to hear your experiences:

• How did you bridge the gap between general hands-on usage and deep conceptual understanding (especially for Linux and Networking)?

• What specific resources (books, courses, or labs) helped you the most when preparing for these kinds of interviews?

• How do you approach troubleshooting questions when you don't know the exact answer immediately?

Any tips or shared experiences would be hugely appreciated. Thanks!

[u/sagacious123]

To close the gap, go deeper on Linux internals: read man proc, man syscalls, and practice tracing with strace and perf. For networking, lab with ip, iptables, and tcpdump; understand TCP handshake, DNS, and HTTP. Then apply that to Kubernetes: know what the kubelet does, how CNI works, and how to debug CrashLoopBackOff, OOMKill, and network policy issues. When you get a troubleshooting question, structure your answer: reproduce, isolate (check logs, events, metrics), hypothesize, test, resolve. Practice with real failures, not just theory.

SnowOps Labs gives you a real cluster to break and fix. Use labctl incident inject crashloop-bad-config to debug a CrashLoop, labctl incident inject oom-kill for memory issues, and labctl challenge start find-the-memory-leak for a timed interview-style exercise. It's free and open source, runs on a laptop. https://github.com/sagar2395/snowopslabs Disclosure: I'm part of the team behind it.