In this article, you will learn how to create and enable a swap file in an EC2 instance running Ubuntu to extend the memory. We will go step by step through the process and also show you how to automatically enable the swap file on system startup. This is particularly useful if you have an instance with low memory and need more resources.
Step 1: Create the swap file
First, we need to create a swap file. This will be used to extend the memory by acting as additional virtual memory.
Run the following command to create a 1 GB swap file:
sudo fallocate -l 1G /swapfile
This will create a 1 GB empty file named
/swapfile. You can create a larger or smaller swap file by adjusting the value of
Step 2: Set permissions for the swap file
Next, we need to set the permissions for the swap file to ensure that only the root user can access it. Run the following command to do this:
sudo chmod 600 /swapfile
Step 3: Format the swap file
Before we can use the swap file, we need to format it. Run the following command to do this:
sudo mkswap /swapfile
This will format the swap file and prepare it for use as swap memory.
Step 4: Enable the swap file
Now we can enable the swap file by running the following command:
sudo swapon /swapfile
The swap file is now enabled and will be used to extend the memory.
Step 5: Automatically enable the swap file on system startup
To ensure that the swap file is automatically enabled on system startup, we need to add it to the /etc/fstab file. Open the file with the following command:
sudo nano /etc/fstab
Add the following line at the end of the file:
/swapfile swap swap defaults 0 0
Save the file and close the text editor. The swap file will now be automatically enabled on system startup.
To verify that the swap file was correctly enabled, run the following command:
This will show you the current memory status and should also display the additional swap memory.
In this step-by-step guide, we learned how to create and enable a swap file in an EC2 instance running Ubuntu to extend the memory. We created the swap file, set the permissions, formatted it, and finally enabled it. We also learned how to automatically enable the swap file on system startup by adding it to the