How to Make a Swap Space Using a Swap File in Linux
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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