Adding Swap to your KVM VPS
This guide is applicable only for KVM based VPSes and dedicated servers, If you wish to increase swap on your OpenVZ based VPS please contact us via a Support ticket from the client area.
Once you've done this, we suggest limiting the use of SWAP as using a lot of SWAP affects the Disk I/O, we suggest using the maximum amount of RAM as possible.
Please click here to know how to limit the SWAP usage and maximize the use of RAM.
Creating the swap file
The following command creates a 512 MB swap file,
dd if=/dev/zero of=/swapfile1 bs=1024 count=524288
If you're running low on disk space or need a small swap file, create a 128 MB swap file with the following command,
dd if=/dev/zero of=/swapfile1 bs=1024 count=131072
or a 64 MB swap file with the following,
dd if=/dev/zero of=/swapfile1 bs=1024 count=65536
Now setup the swap space
Setting up permissions for the swap file
chown root:root /swapfile1 chmod 0600 /swapfile1
Activating the swap file
Verify that the swap file is activated
Make the change permanent by editing the /etc/fstab file
We will now use the nano file editor to make changes in the fstab file which will make the swapfile permanent and doesn't turn off after a reboot.
Add the following line at the end of the file.
/swapfile1 swap swap sw 0 0
Save and exit the file.
You can reboot the server to confirm if the Swap is enabled.