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1. Check memory usage
Check the usage of virtual memory before swap is added
free -m
2. Create swap file
Use the dd command to create a swap file with a size of 2G
dd if=/dev/zero of=/home/swap bs=1024 count=2048000 The larger the file, the more factory the time it is created.
3. Convert to swap format
Convert file format to swap format
mkswap /home/swap
4. Mount the swap partition
Use the swapon command to mount the swap partition to the swap partition
swapon /home/swap If an error is reported: swapon: /home/swap: insecure permissions 0644, 0600 suggested.
Modify permissions:
chmod 600 /home/swap
5. Check the memory usage again
Pay attention to the changes in observation and 1.
free -m
6. Setting up restart is still valid
To prevent the swap partition from becoming 0 after restart, you need to modify the /etc/fstab file:
At the end of the file (the last line)
/home/swap swap swap default 0 0
7. Deactivate virtual memory
swapoff -v /home/swap