How to create a swap file on ubuntu 12.04. Summary from: [Digital Ocean](https://www.digitalocean.com/community/articles/how-to-add-swap-on-ubuntu-12-04)

Ubuntu-Creating-Swap-File

# Summary from: https://www.digitalocean.com/community/articles/how-to-add-swap-on-ubuntu-12-04

# 1. Check if swap exists returns single line output if swap doesn't exist

$ sudo swapon -s
Filename  			Type		Size	Used	Priority

# 2. Check disk space on root (/) with DF command:
$ df
Filesystem     1K-blocks    Used Available Use% Mounted on
/dev/sda        20907056 1437188  18421292   8% /
udev              121588       4    121584   1% /dev
tmpfs              49752     208     49544   1% /run
none                5120       0      5120   0% /run/lock
none              124372       0    124372   0% /run/shm

# 3. Create and enable Swap
$ sudo dd if=/dev/zero of=/swapfile bs=1024 count=512k
$ sudo mkswap /swapfile
$ sudo swapon /swapfile

# 4. Open file
$ sudo nano /etc/fstab

# 5. Paste/Append:
/swapfile       none    swap    sw      0       0 

# 6. Configure Swapfile to be used for emergency buffer, prevening out-of-memory crashes
$ sudo su -
$ echo 0 > /proc/sys/vm/swappiness
$ exit

#7. Setup proper file permissions
$ sudo chown root:root /swapfile 
$ sudo chmod 0600 /swapfile