How to Make a Swap Space Using a Swap File in Linux
This article is based on the content of aws knowledgebase.
Below is how to resolve such specific problem.
Oh, this is not the case if you already have a dedicated(partitioned) swap space, it's a better option in any case but in most cases, we will be playing with servers without a swap patition.
Okay, let's get started.
As a general rule, calculate swap space according to the following:
|Amount of physical RAM||Recommended swap space|
|2 GB or less||2 *
|More than 2 GB, less than 32 GB||4 GB + (
|32 GB or more||1 *
Important Note: Swap sapce should never be less than 32 MB!
Create a swap file
1sudo dd if=/dev/zero of=/swapfile bs=128M count=YOUR_COUNT
In the above command, bs is block size which should be less than the available memory at that moment.
bs * YOUR_COUNT will be your swap file size, for example,
bs=128M count=32 means your swap file will be 4096 MB in size.
Update the read and write permissions for the swap file
1sudo chmod 600 /swapfile
Set up a Linux swap area
1sudo mkswap /swapfile
Make the swap file available for immediate use by adding the swap file to swap space
1sudo swapon /swapfile
Verify that the procedure was successful:
1sudo swapon -s
Enable the swap file at boot time by editing the
1sudo vim /etc/fstab
Add the following line at the end of the file:
1/swapfile swap swap defaults 0 0