I have an interview this Thursday for an Advanced Application Support role involving troubleshooting hosted Linux virtual machines. I've used Ubuntu as my daily driver for about three years and use the terminal for basic tasks, but I'm nervous about the command-line portion of the interview. The role involves monitoring 24/7 Linux VMs, interpreting Grafana alerts, and resolving issues or escalating them to hospital IT teams. What fundamentals and troubleshooting commands should I review, and how can I practice explaining my reasoning?
4 Answers
Interactive practice labs can help you get comfortable with SSH, permissions, files, processes, and basic troubleshooting under pressure. The main thing is to talk through your thinking during the interview. It is completely reasonable to say that you would start by checking the relevant logs, confirm the scope of the issue, and look for recent changes before attempting a fix. A methodical approach usually matters more than instantly recalling every option.
Get some hands-on practice instead of only reading command cheat sheets. Break a service, fill a test disk, change a configuration, or create a permissions problem on a disposable Ubuntu VM, then work through the symptoms and fix them. You can also inspect a system report such as sosreport to see the kinds of commands and information administrators use when investigating disk, process, network, and service problems.
Three years of desktop Ubuntu use gives you a starting point, but advanced Linux administration is a much broader area. Reviewing RHCSA-level material would be useful even if you do not take the certification. Pay particular attention to services, permissions, processes, storage, networking, logs, and basic system recovery. Since your position sounds closer to application and monitoring support than full system administration, prioritize the troubleshooting workflow and knowing when to escalate.
For this kind of support role, focus on a small set of fundamentals rather than trying to memorize every command. Practice checking processes with top or htop, reviewing logs with journalctl and tail, checking storage with df and du, and investigating networking with ss, ping, and related tools. More important than perfect syntax is explaining your process: confirm the alert, identify what changed, check logs and system health, test a likely cause, and either fix or escalate with useful evidence.
That matches the position better than I initially explained. I’d mainly be supporting applications running on hosted Linux VMs, monitoring Grafana alerts, and resolving or escalating issues with hospital IT teams. I’ll focus on the core troubleshooting concepts rather than trying to become a full Linux administrator before the interview.