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How to create and use a Swap file

Posted by bodhi 
How to create and use a Swap file
December 27, 2022 03:55PM
This instruction will be revised to add more detailed discussion. Below are the basic steps to create a swap file and activate it.

1. Create the swap file of 512MB at the rootfs top directory
cd /
dd if=/dev/zero of=swapfile1 bs=1024 count=524288
mkswap swapfile1 
chmod 0600 swapfile1

2. Turn on swap
swapon /swapfile1

3. Check the swap space

free -h
total        used        free      shared  buff/cache   available
Swap:          511Mi          0B       511Mi

/swapfile1 file 512M   0B   -2

4. Add swapfile1 entry to fstab so that it will be automatically on during boot.

cat /etc/fstab
# /etc/fstab: static file system information.
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
LABEL=rootfs   /               ext3    noatime,user_xattr,acl,errors=remount-ro 0 1
/swapfile1     swap            swap    defaults          0       0
tmpfs          /tmp            tmpfs   defaults          0       0

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Edited 4 time(s). Last edit at 12/27/2022 08:03PM by bodhi.

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