How to increase Swap space on Running system without Downtime

If you want incrase 2 GB of swap then follow below Steps

dd if=/dev/zero of=/swapfile bs=1024 count=2097152

#mkswap /swapfile


#swapon /swapfile

#swapon -s

check the swap file


#cat /proc/swaps

If you want parmanent then add line in fstab file

#vi /etc/fstab
/swapfile none swap sw 0 0

save the file and check with free commands

#free