ubuntu (virtual machine) version 16.04 LTS
Add swap
Use free to view the swap partition size
free -m
Create a swap folder
mkdir swap
cd swap
sudo dd if=/dev/zero of=swapfile bs=1024 count=100000
The size of count corresponds to the size of swap, as shown in the above code, count=100000 is about 100M
Note: Pay attention when setting the count value. If you set the swap size to exceed the size of the hard disk, it will cause the graphical interface of the virtual machine ubuntu to not enter after the setting is restarted.
Convert the generated file into a swap file
mkswap swapfile
Activate the swap file
swapon swapfile
If you need to automatically start every time you enter, you need to modify /etc/fstab to automatically mount:
Add to the file
/disk2/swap swap defaults 00
(Because I created the swap file in disk2, the path is /disk2/swap)
If it does not start automatically, it will enter the swap folder after every restart and activate it with the swapon swapfile command
Check the size of the swap partition again and confirm that the swap setting is successful
free -m
Delete swap
After use, delete the swap area
Enter the swap folder and close swap
cd swap
swapoff swapfile
Turn off automatic mounting (skip this step if /etc/fstab has not been modified)
vi /etc/fstab
Add # before the statement added or delete it
Note: If there is no permission to modify /etc/fstab, it will prompt that this file is read-only and cannot be modified. Solution: Use the following statement to save
：w ！sudo tee%
delete
rm -r swapfile
Problems I encountered during configuration:
When setting the swap size, the size of the virtual machine's hard disk exceeded the size of the virtual machine's hard disk, which caused the ubuntu graphical interface of the virtual machine to be unable to enter after restarting. Use the following methods to solve:
ctrl+alt+F1 enters text mode
Check the disk space to see if it is because the disk space is full that you cannot enter the graphical interface
df -h
Found that the disk space is full, some files need to be deleted
You can use the rm -r statement to delete some files, or you can delete swap using the method mentioned above, and reconfigure
The above is the whole content of this article, I hope it will be helpful to everyone's study.
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