Add Swap Memory t3.micro

### **1. Check Current Swap**

sudo swapon --show

If there’s no output, swap is not enabled.

### **2. Check Available Disk Space**

df -h

Ensure there’s enough space on your instance to create a swap file.

### **3. Create a Swap File**
For a 1GB swap file:

sudo fallocate -l 1G /swapfile

If `fallocate` isn’t available, use:

sudo dd if=/dev/zero of=/swapfile bs=1M count=1024

### **4. Set Correct Permissions**

sudo chmod 600 /swapfile

### **5. Set Up the Swap Area**

sudo mkswap /swapfile

### **6. Enable the Swap File**

sudo swapon /swapfile

### **7. Verify Swap**

sudo swapon --show
free -h

### **8. Make Swap Persistent Across Reboots**
Edit the `/etc/fstab` file:

sudo nano /etc/fstab

Add the following line:

/swapfile swap swap defaults 0 0

Save and exit (`Ctrl + O`, `Enter`, `Ctrl + X`).

### **9. Optional: Adjust Swappiness**
Swappiness determines how often the system uses swap. Lower values reduce swap usage, preserving performance. Check the current value:

cat /proc/sys/vm/swappiness

Set it to a lower value (e.g., 10):

sudo sysctl vm.swappiness=10

Make it permanent by adding to `/etc/sysctl.conf`:

vm.swappiness=10

### **10. Optional: Adjust Cache Pressure**
Reduce cache pressure for better performance:

sudo sysctl vm.vfs_cache_pressure=50

Make it permanent by adding to `/etc/sysctl.conf`:

vm.vfs_cache_pressure=50

### **Cleanup if Needed**
To disable and remove the swap file:

sudo swapoff /swapfile
sudo rm /swapfile

This will effectively add swap memory to your t3.micro instance while keeping within the AWS free tier limitations.