61 lines
1.5 KiB
Bash
61 lines
1.5 KiB
Bash
#!/bin/bash
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# Function to create swap file
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create_swapfile() {
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# Detect the main disk by finding the partition mounted on root ('/')
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mount_point=$(df / | tail -1 | awk '{print $6}')
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# Get available space on the partition in MB
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available_space=$(df -BM $mount_point | tail -1 | awk '{print $4}' | sed 's/M//')
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# Calculate 5% of the available space, and ensure it's within the limits (max 30GB)
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swap_size=$((available_space * 5 / 100 / 1024)) # Convert MB to GB
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if [ $swap_size -gt 30 ]; then
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swap_size=30
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elif [ $swap_size -lt 1 ]; then
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echo "Not enough disk space to create a swap file."
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exit 1
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fi
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echo "Creating a ${swap_size}GB swap file at /swapfile..."
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# Remove existing swapfile if it exists
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if [ -f /swapfile ]; then
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sudo swapoff /swapfile
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sudo rm /swapfile
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echo "Existing swapfile removed."
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fi
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# Create the swap file
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sudo fallocate -l ${swap_size}G /swapfile
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sudo chmod 600 /swapfile
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sudo mkswap /swapfile
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sudo swapon /swapfile
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echo "Swap file of ${swap_size}GB created and activated."
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}
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# Function to persist the swap file across reboots
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persist_swapfile() {
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echo "/swapfile none swap sw 0 0" | sudo tee -a /etc/fstab
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echo "Swap file added to /etc/fstab."
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}
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# Check if --persist flag is passed
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persist=false
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if [ "$1" == "--persist" ]; then
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persist=true
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fi
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# Main script execution
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create_swapfile
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if [ "$persist" = true ]; then
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persist_swapfile
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else
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echo "Swap file will not persist after reboot."
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fi
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# Show current swap status
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sudo swapon --show
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