Adding a swap file to Ubuntu 16.x
Recently, I needed to add a swap to a Linux host that didn't have a spare partition, therefore, I was able to use this method to create a swap file, activate, and test it. 1. Create the temporary directory we will use for swap. # mkdir -v /var/cache/swap 2. Create the swap file in the temporary directory (In the example below, we are creating a 500MB swap file, change to suit your needs) # dd if=/dev/zero of=/var/cache/swap/swapfile bs=1M count=500 3. Change the mode of the file so only root can read/write to it # chmod 600 /var/cache/swap/swapfile 4. Activate the swap file # mkswap /var/cache/swap/swapfile 5. Verify the swapfile using 'free -m' or 'swapon -s' # swapon -s 6. Add the swap partition to fstab to make the swap file presistant across reboots # echo "/var/cache/swap/swapfile none swap sw 0 0" | sudo tee -a /etc/fstab 7. To ensure you can reboot correctly, test the swap file by disabling it, then enabling it # swapoff /var/c...
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