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This article focuses on "how to use swap files on Linux systems to expand swap space", interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn how to use swap files to expand swap space on Linux systems.

Imagine a scenario where our Linux system runs out of swap space, in which case we want to use swap partitions to expand swap space, but in some cases there are no free partitions available on disk, so we can't expand it.

Therefore, in this case, we can use the swap file to increase the swap space.

Here is how to expand swap space on Linux using swap files

Let's first check the size of the existing swap space / partition, using the command 'free-m' or 'swapon-s'

My swap partition size is 2 GB, and we will extend the swap space to 1GB.

Step 1: use the following dd command to create an exchange file with the size of 1GB

The code is as follows:

[root@linuxtechi ~] # dd if=/dev/zero of=/swap_file bs=1G count=1

1: 0 records in

1: 0 records out

1073741824 bytes (1.1GB) copied, 414.898 s, 2.6MB/s

[root@linuxtechi ~] #

Replace the size of 'bs'' and 'count'' as you need.

Step 2: set the swap file permissions to 600

The code is as follows:

[root@linuxtechi ~] # chmod 600 / swap_file

Step 3: open the exchange area (swap_file) with a file

Open the exchange area with the mkswap command

The code is as follows:

[root@linuxtechi ~] # mkswap / swap_file

Setting up swapspace version 1, size = 1048572 KiB

No label, UUID=f7b3ae59-c09a-4dc2-ba4d-c02abb7db33b

[root@linuxtechi ~] #

Step 4: add an exchange file entry to the fstab file

Add the following entry to the fstab file so that the exchange file can continue to use each other after each restart.

The code is as follows:

/ swap_file swap swap defaults 0 0

Step 5: enable swap files with the command 'mkswap on'.

The code is as follows:

[root@linuxtechi ~] # swapon / swap_file

[root@linuxtechi ~] #

Step 6: check the swap space now

Note: to avoid unexpected situations, turn it off using the swapoff command as shown below, and re-enable the swap file using the swapon command shown in step 5 only if you need it.

The code is as follows:

[root@linuxtechi ~] # swapoff / swap_file

[root@linuxtechi ~] #

At this point, I believe you have a deeper understanding of "how to use swap files on Linux systems to expand swap space". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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