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How To Increase Swap Size in Encrypted Ubuntu 18.04 with LVM

Ubuntu 18

In this article, we will be discussing how to increase the swap size in an encrypted Ubuntu 18.04 system using Logical Volume Management (LVM). This process can be a bit complex, so we’ll break it down into manageable steps and provide detailed explanations.

Quick Answer

To increase swap size in an encrypted Ubuntu 18.04 system with LVM, you can either add a swap file or resize the swap volume using LVM. Adding a swap file involves creating a new file, formatting it as swap space, activating it, and making it permanent. Resizing the swap volume using LVM requires using the LVM management tool to extend the logical volume. Choose the method that best suits your needs and make sure to have a backup of your data before making any changes.

Introduction

Swap space in Linux is used when the amount of physical memory (RAM) is full. If the system needs more memory resources and the RAM is full, inactive pages in memory are moved to the swap space. Increasing swap space can be beneficial if your system is frequently running out of memory.

Precautions

Before we begin, it’s important to note that resizing partitions or volumes can be risky. Therefore, ensure you have a complete backup of your important data before proceeding. Additionally, it’s recommended to close any applications using swap space before making any changes.

Method 1: Adding a Swap File

The simplest way to increase swap space is by creating a new swap file. Here’s how you can do it:

Step 1: Create the Swap File

We will use the dd command to create a swap file. The if parameter specifies the input file (in this case, /dev/zero), of specifies the output file (the swap file), bs sets the block size, and count determines the number of blocks.

To create a 1GB swap file, run the following command:

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

Step 2: Format the Swap File

Next, we need to format the newly created file as swap space. This is done using the mkswap command:

sudo mkswap /swapfile

Step 3: Activate the Swap File

To start using the swap file, we need to activate it with the swapon command:

sudo swapon /swapfile

Step 4: Make the Swap File Permanent

To ensure the system continues to use the swap file after a reboot, add the following line to the /etc/fstab file:

/swapfile none swap sw 0 0

Method 2: Resizing the Swap Volume Using LVM

If you have LVM set up, you can resize the swap volume directly. Here’s how:

Step 1: Open LVM

Open the LVM management tool with the kpvm command:

sudo kpvm

Step 2: Locate the Swap Volume

In the LVM interface, locate the swap volume.

Step 3: Extend the Logical Volume

Right-click on the swap volume and choose “Extend logical volume”. Specify the new size for the swap volume and apply the changes.

Note: If the “Extend logical volume” option is disabled, you may need to reduce the size of another volume first.

Conclusion

Increasing swap size in an encrypted Ubuntu 18.04 with LVM setup can be achieved through two methods: adding a swap file or resizing the swap volume using LVM. Both methods have their pros and cons, so choose the one that best fits your needs. As always, ensure you have a backup of your data before making any changes to your system’s configuration.

Is it necessary to close any applications using swap space before increasing the swap size?

Yes, it is recommended to close any applications using swap space before making any changes to ensure data integrity.

Can I increase the swap size without using Logical Volume Management (LVM)?

Yes, you can increase the swap size by adding a swap file as mentioned in Method 1 of the article.

How do I check the current swap size on my Ubuntu 18.04 system?

You can use the free command with the -h option to display the current swap size in a human-readable format. The swap size is listed under the "Swap" column.

Can I remove the swap file or resize the swap volume after increasing the swap size?

Yes, you can remove the swap file or resize the swap volume if needed. To remove the swap file, you can disable it using the swapoff command and then delete the file. To resize the swap volume, you can use the LVM management tool to reduce its size.

What should I do if I encounter any issues while increasing the swap size?

If you encounter any issues, it’s recommended to consult official documentation, online forums, or seek assistance from experienced users or professionals. Be cautious while making changes to your system’s configuration and ensure you have a backup of your data before proceeding.

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