I need additional swap space to improve my Linux server performance,So here is a simple tutorial you can follow:
Before we proceed to swap file setup, we have to check if any swap files exist by looking at the summary of swap usage.
swapon -s
If the summary is empty, it means no swap file exists.
As we know that we do not have a swap file enabled, we can check how much space we have on the server with the following command.
df
+
The swap file will take 512MB and we are using only 26% so we can proceed.Now we can create the swap file using the dd command :
sudo dd if=/dev/zero of=/swapfile bs=1024 count=512k
It simply looks like this:
Next, create a swap file area using this command:
mkswap /swapfile
Setup correct file permissions:
chown root:root /swapfile chmod 0600 /swapfile
Activate swap using this command:
swapon /swapfile
Check the summary again:
swapon -s
The last thing to do is to configure Swap to run and enabled each time your server reboots, edit the file nano /etc/fstab and add the following line at the end of file:
/swapfile none swap sw 0 0
Save changes and exit the editor.
You can verify swap is activated or not by simply using the below command:
Done!!