On the server there is 4GB memory and 4GB swap file on TEST server which is not enough.

Now the existing swap partition is created in lvm and there is no scope to increase the size

To overcome this problem create a swapfile using dd command with permission 0600

Change the file permission to 0600

Set the file as swap area

Test by enabling the swap on swapfile

Make this boot persistent by adding the entry in fstab

Always run mount -a command to check if any error in fstab file

Now disable swap on /swapfile which we have enabled manually and check swap partitions

Now check boot persistence by swapon command