Configure swap on a Linux VPS

On a low-RAM VPS, swap reduces out-of-memory kills. This guide adds a swap file.

📋 Prerequisites

• Linux VPS with root/sudo
• Free disk space (e.g. 2 GB for a 2 GB swap file)

Check RAM and current swap

Bash
1free -h
2swapon --show

Create a 2 GB swap file

Bash
1sudo fallocate -l 2G /swapfile
2sudo chmod 600 /swapfile
3sudo mkswap /swapfile
4sudo swapon /swapfile

Enable on boot

Bash
1echo '/swapfile none swap sw 0 0' | sudo tee -a /etc/fstab

Tune swappiness (optional)

10–30 is often better for VPS:

Bash
1echo 'vm.swappiness=20' | sudo tee /etc/sysctl.d/99-swappiness.conf
2sudo sysctl -p /etc/sysctl.d/99-swappiness.conf

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More stable server! 🚀