How Linux adds and enlarges swap partitions (swap) _linux

1) Add or enlarge the swap partition
#dd If=/dev/zero Of=/home/swap bs=512 count=1024000
BS is the sector size bs=512 refers to the size of 512B count is the number of sectors
Indicates that a file of size 512M is created/home/swap filled with a null value. The position can be adjusted by itself.
2) Create an Exchange partition
/sbin/mkswap Swapfile

3) activating the swap partition
/sbin/swapon Swapfile
4) Query the current system in effect of the swap partition
/sbin/swapon-s
5) Set the boot on their own mount
/etc/fstab, add the following line
Redhat or CentOS:
#/home/swap Swap Defaults 0 0
Ubuntu:
#/home/swap None swap SW 0 0
Use MOUNT-A to detect correct changes