Linux · Systems fluency
What Linux operational best practices should a team follow?
Short answer
Treat servers as replaceable and changes as reviewed: use configuration management, least privilege, tested backups, patching, monitoring, and documented rollback. Prefer small reversible changes over manual drift.
Good operations reduce the number of unique snowflakes. Define host configuration in version control, apply it through automation, and make manual changes exceptional. If a host dies, you should be able to rebuild it without remembering undocumented steps.
cp /etc/ssh/sshd_config /etc/ssh/sshd_config.bak
sshd -t
systemctl reload sshdThe operational baseline
- Patch on a cadence and track exceptions with an owner and expiry date
- Use least privilege for users, services, and automation credentials
- Back up data and verify restores, not just backup job success
- Monitor symptoms users care about, with alerts that have runbooks
- Review changes, stage risky ones, and keep a tested rollback
- Document ownership, dependencies, and recovery procedures
Avoid adopting complexity without a concrete operational need. A simple service with clear logs, resource limits, and a tested restore path is usually more reliable than a sophisticated platform nobody understands. Measure the cost of maintenance, not only the cost of the initial build.
Follow-ups you should expect
Interviewers use these to check whether the first answer was understanding or memorisation.
- 1How do you prevent configuration drift?
- 2What makes a backup actually trustworthy?
- 3How would you prioritize patching across many servers?
- 4When is it acceptable to make a manual production change?
Say it in the interview
I try to make servers reproducible and changes reversible. Configuration lives in version control and is applied through automation, with manual changes treated as exceptions. I prioritize patching, least privilege, tested restores, and monitoring with runbooks. The goal is not maximal complexity but predictable recovery and a small blast radius.
Use this as a model, not a script. Saying it in your own words is what makes it survive follow-up pressure.
Related questions
Reading is step one
Now say it out loud.
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