Comprehensive Guide for Swap Management, VM Stability, and Cleanup

Kali Linux Optimization Master Log

Comprehensive Guide for Swap Management, VM Stability, and Cleanup

1. The Core Memory Upgrade (Swap File)

To support 6+ VMs and Local AI on 16GB RAM, we replaced a 1GB physical partition with a 16GB Swap File.

# Create and Activate 16GB Swap
sudo swapoff -a
sudo fallocate -l 16G /swapfile
sudo chmod 600 /swapfile
sudo mkswap /swapfile
sudo swapon /swapfile
free -h

Verification: free -h should show ~15Gi to 17Gi under the Swap column.

2. Automation & Stability Scripts

A. The Panic Button (Pause All VMs)

Filename: ~/bin/vm_panic.sh

#!/bin/bash
RUNNING_VMS=$(vboxmanage list runningvms | cut -d '"' -f 2)
echo "$RUNNING_VMS" | while read -r VM; do
    vboxmanage controlvm "$VM" pause
done
notify-send -u critical "PANIC" "All VirtualBox VMs PAUSED."

B. The Resume Button (Unpause All)

Filename: ~/bin/vm_resume.sh

#!/bin/bash
PAUSED_VMS=$(vboxmanage list vms | cut -d '"' -f 2 | while read -r VM; do 
    vboxmanage showvminfo "$VM" --machinereadable | grep -q 'VMState="paused"' && echo "$VM"
done)
echo "$PAUSED_VMS" | while read -r VM; do
    vboxmanage controlvm "$VM" resume
done
notify-send "System Restored" "All paused VMs RESUMED."

3. GUI Cleanup: Deleting Ghost Partitions

We deleted the physical 1GB partition (sdb3) and cleaned /etc/fstab to prevent boot delays.

# Cleanup Command
sudo cp /etc/fstab /etc/fstab.bak && sudo sed -i '/sdb3/d' /etc/fstab
sudo systemctl daemon-reload

Warning: Always check cat /etc/fstab after running sed commands to ensure no critical lines were removed.

4. System Health Check

Use this script to verify your setup is still optimal after a reboot.

1. Create the health check script: nano ~/check_health.sh
2. Paste the code below and save the file.
3. Execute with: bash ~/check_health.sh (Do not use python).

#!/bin/bash
# check_health.sh
echo "--- Swap Health Check ---"
SWAP_SIZE=$(free -h | grep Swap | awk '{print $2}')
echo "Active Swap Size: $SWAP_SIZE"
GHOSTS=$(grep "sdb3" /etc/fstab | grep -v "#")
if [ -z "$GHOSTS" ]; then echo "Result: /etc/fstab is CLEAN"; fi
PERMS=$(stat -c "%a" /swapfile)
if [ "$PERMS" == "600" ]; then echo "Result: Permissions are CORRECT"; fi

✔ SYSTEM OPTIMIZED

16GB RAM + 16GB Swap File | 0.03% Disk overhead | VM Stability: High

Generated on Feb 13, 2026 | User: Kali Linux Power User
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