Creating a swap file
Step-by-step guide to creating a swap file
Swap file is necessary for storing information in cases when the amount of RAM is insufficient. Such memory works much slower than RAM, therefore active use of such memory is highly undesirable.
Initially, you should create a file that will be used as swap. In this case, we create a 2 GB file.
Set correct file permissions
We create a swap from the specified file, at the output we get the following.
Setting up swapspace version 1, size = 2097148 KiB
no label, UUID=97f81d12-80ca-4a61-ad17-1c094f52e36d
Next, enable the use of swap in this file.
You can check if swap is working with the free command
total used free shared buff/cache available
Mem: 3,8G 96M 3,5G 8,5M 268M 3,5G
Swap: 2,0G 0B 2,0G
As you can see in the screenshot, swap is enabled.
To mount this file as a swap file at system startup, you must make the following entry in the / etc / fstab file
Instead of the path to the file, you can specify its UUID, obtained as a result of the mkswap command. In this case, the entry will look like this: