make swap file on linux

make-swap.md

$ free -m
             total       used       free     shared    buffers     cached
Mem:           490        482          7         13          3         55
-/+ buffers/cache:        423         66
Swap:            0          0          0

$ sudo dd if=/dev/zero of=/swapfile bs=32M count=16
16+0 records in
16+0 records out
536870912 bytes (537 MB) copied, 10.2107 s, 52.6 MB/s

$ sudo chmod 600 /swapfile

$ sudo mkswap /swapfile
Setting up swapspace version 1, size = 524284 KiB
no label, UUID=f3167ae7-4edf-4355-abd4-85881f7a0c66

$ sudo swapon /swapfile

$ sudo swapon -s
Filename				Type		Size	Used	Priority
/swapfile                               file		524284	0	-1

$ free -m
             total       used       free     shared    buffers     cached
Mem:           490        483          6         13          7        144
-/+ buffers/cache:        330        159
Swap:          511          0        511

swap.sh

sudo dd if=/dev/zero of=/swapfile bs=32M count=16
sudo chmod 600 /swapfile
sudo mkswap /swapfile
sudo swapon /swapfile
sudo swapon -s
free -m