How do I add swap after system installation? - Ask Ubuntu
From Ubuntu version swap partition is replaced with swapfile by default for Step 6: Add newly created swap partition to /etc/fstab file. Add it into fstab file to make it persistent on the next system boot. echo "/var/cache /swap/swapfile none swap sw 0 0" | sudo tee -a /etc/fstab. To enable it at boot time, edit /etc/fstab to include the following entry: /swapfile swap swap defaults 0 0. The next time the system boots, it enables the new swap .
This is a value between 0 and that represents a percentage. With values close to zero, the kernel will not swap data to the disk unless absolutely necessary. Remember, interactions with the swap file are "expensive" in that they take a lot longer than interactions with RAM and they can cause a significant reduction in performance. Telling the system not to rely on the swap much will generally make your system faster.
Values that are closer to will try to put more data into swap in an effort to keep more RAM space free. Depending on your applications' memory profile or what you are using your server for, this might be better in some cases. We can see the current swappiness value by typing: For a server, you might want to move it closer to 0.
We can set the swappiness to a different value by using the sysctl command. For instance, to set the swappiness to 10, we could type: This setting configures how much the system will choose to cache inode and dentry information over other data. Basically, this is access data about the filesystem.
How To Add Swap Space on Ubuntu | DigitalOcean
This is generally very costly to look up and very frequently requested, so it's an excellent thing for your system to cache. You can see the current value by querying the proc filesystem again: We can set this to a more conservative setting like 50 by typing: We can change that by adding it to our configuration file like we did with our swappiness setting: Conclusion Following the steps in this guide will give you some breathing room in cases that would otherwise lead to out-of-memory exceptions.
Swap space can be incredibly useful in avoiding some of these common problems. Create a Swap File Now that we know our available hard drive space, we can go about creating a swap file within our filesystem. The best way of creating a swap file is with the fallocate program.
This command creates a file of a preallocated size instantly. Adjust this to meet the needs of your own server: Enabling the Swap File Now that we have a file of the correct size available, we need to actually turn this into swap space. First, we need to lock down the permissions of the file so that only the users with root privileges can read the contents. This prevents normal users from being able to access the file, which would have significant security implications.
Make the file only accessible to root by typing: We can now mark the file as swap space by typing: Make the Swap File Permanent Our recent changes have enabled the swap file for the current session.
However, if we reboot, the server will not retain the swap settings automatically. Adjusting the Swappiness Property The swappiness parameter configures how often your system swaps data out of RAM to the swap space. This is a value between 0 and that represents a percentage. With values close to zero, the kernel will not swap data to the disk unless absolutely necessary. Remember, interactions with the swap file are "expensive" in that they take a lot longer than interactions with RAM and they can cause a significant reduction in performance.
Telling the system not to rely on the swap much will generally make your system faster. Values that are closer to will try to put more data into swap in an effort to keep more RAM space free. Depending on your applications' memory profile or what you are using your server for, this might be better in some cases.
If you are shrinking a disk with the Windows system on it, then you'd better use Windows to shrink the disk It knows its own stuff.
How To Create a Linux Swap File
If you are on a pure ubuntu, try resizing using a live Ubuntu USB. Backup your system, and defrag your drive. Right Click on the start bar. Type in the correct amount. If you are in Ubuntu. Make sure you use Ubuntu tools. With some experimentation, I was allowed Then I tried again and it worked. I should thank my primary school math teacher for that one more than the MS Windows programmers. That left me with 1. Format the partition Now I am ready for gparted to format that space as a proper swap drive.
If you are dual booting, you should know already that Windows does a fake shut down under normal circumstances. Some people have disabled "Fast Boot". I do not have that choice on my system Windows 10 and must use the shift key thanks to my friend Google. If you boot with a live USB and you cannot mount the "C" drive by clicking on itthen you did not fully shut down properly. Reload windows and shut down again using the shift key.
Now you are in Ubuntu Live Mode and read below: If you are a pure Ubuntu and did not shrink in Windows. You will use the Resize option in gParted. If you already shrank your drive, do not do the resize step. You can type GParted in the Dash bar and get the application quite quickly. Right click on the drive you want to resize.