Q1. How do you find which process is using a port on Linux?
Use ss, lsof, or fuser depending on what is installed. ```bash sudo ss -ltnp | grep ':8080' sudo lsof -i :8080 sudo fuser -n tcp 8080 ``` - ss -ltnp lists listening TCP s...
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Q2. How do you troubleshoot a Pod stuck in CrashLoopBackOff?
CrashLoopBackOff means the container starts, exits, and Kubernetes restarts it with exponential backoff. 1. Get the state and previous logs. ```bash kubectl get pod web-1...
Q3. How do you troubleshoot a container that exits immediately?
A container stops when its main process exits, so first find out why the process ended. 1. Inspect the exit code and state. ```bash docker ps -a docker inspect --format '...
Q4. How would you troubleshoot a failed Azure VM deployment?
Use the deployment history and activity log first, then drill into the resource. 1. Inspect the failed deployment operations to get the exact error code. ```bash az deplo...
Q5. How would you troubleshoot high latency from an EC2 instance?
Work from the outside in and use metrics before guessing. 1. Confirm scope: is it the instance, the network, the application, or a dependency? Check CloudWatch CPU, netwo...
Q6. How do you troubleshoot a network problem methodically?
Network troubleshooting is easier when you reason up the layers and use the right tool at each step. - `ping` checks reachability and round-trip time using ICMP and revea...