Check for Swap Space
sudo swapon -s
An empty list will confirm that you have no swap files enabled:
Filename Type Size Used Priority
Check the File System
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
Create and Enable the Swap File
sudo dd if=/dev/zero of=/swapfile bs=1024 count=256k
sudo mkswap /swapfile
The results display:
Setting up swapspace version 1, size = 262140 KiB no label, UUID=103c4545-5fc5-47f3-a8b3-dfbdb64fd7eb Finish up by activating the swap file:
sudo swapon /swapfile
You will then be able to see the new swap file when you view the swap summary.
swapon -s Filename Type Size Used Priority /swapfile file 262140 0 -1
This file will last on the virtual private server until the machine reboots. You can ensure that the swap is permanent by adding it to the fstab file.
Open up the file:
sudo nano /etc/fstab
Paste in the following line:
/swapfile none swap sw 0 0
Swappiness in the file should be set to 10. Skipping this step may cause both poor performance, whereas setting it to 10 will cause swap to act as an emergency buffer, preventing out-of-memory crashes.
You can do this with the following commands:
echo 10 | sudo tee /proc/sys/vm/swappiness echo vm.swappiness = 10 | sudo tee -a /etc/sysctl.conf
To prevent the file from being world-readable, you should set up the correct permissions on the swap file:
sudo chown root:root /swapfile sudo chmod 0600 /swapfile
none 124372 0 124372 0% /run/shm
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