VPS Swap Space: How to Configure and Optimize Swap on Linux VPS

Swap space is a critical but often overlooked part of VPS performance. When your VPS runs out of physical RAM, the kernel moves idle memory pages to swap — preventing out-of-memory crashes but at the cost of slower access times. Proper swap configuration keeps your server stable without sacrificing performance.

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How Much Swap Do You Need?

RAM Size	Recommended Swap	With Hibernation
512 MB	1 GB	1 GB
1 GB	1 GB	2 GB
2 GB	1 GB	3 GB
4 GB	2 GB	5 GB
8 GB+	2 GB	RAM × 1.5

Creating Swap on a Linux VPS

Modern Linux systems use a swap file, not a swap partition. This is easier to resize and manage:

# Create a 2GB swap file
sudo fallocate -l 2G /swapfile

# Set correct permissions
sudo chmod 600 /swapfile

# Format as swap
sudo mkswap /swapfile

# Enable it
sudo swapon /swapfile

# Add to fstab for persistence
echo '/swapfile none swap sw 0 0' | sudo tee -a /etc/fstab

# Verify
sudo swapon --show
free -h

Swap Performance Optimization

The swappiness parameter controls how aggressively the kernel uses swap. A value of 10 means the kernel only swaps when RAM is over 90% full — ideal for VPS environments:

# Check current value
cat /proc/sys/vm/swappiness

# Set to 10 (only swap when necessary)
sudo sysctl vm.swappiness=10

# Make permanent
echo 'vm.swappiness=10' | sudo tee -a /etc/sysctl.conf