Increase Swap Size for linux Server

1. Create Swap file

 > touch /swapfile

2. To create 2GB of swap file,

 > dd if=/dev/zero of=/swapfile bs=1024 count=2048000

  For 4GB,

 > dd if=/dev/zero of=/swapfile bs=1M count=4096

3. mkswap /swapfile

Now the swap file is created.

4. To activate /swapfile file,

 > swapon /swapfile

5. Add entry on /etc/fstab file to activate after serevr reboot,

 > vi /etc/fstab

   /swapfile swap    swap    defaults        0 0

Now check the swap space,

 > free -m