Swap Emergency

Create an emergency swap file when RAM is critically low.

A intermediate Linux challenge worth 10 points. Solve it hands-on in a real Linux environment in your browser - no local setup, no fake shells.

The Challenge

A Java service heap is ballooning at 2 AM. free -h shows only 200 MB RAM left. You have minutes before the OOM killer fires.

Your tasks:

• Create a 2 GB swap file at /swapfile using fallocate
• Set permissions to 600 and format with mkswap
• Activate with swapon and verify with free -h
• Add a persistent entry to /etc/fstab
• Run check to validate