How To Add Swap on Ubuntu 12.04 of EC2

Make file (파일 만들기)

~$ sudo dd if=/dev/zero of=/var/swapfile bs=1M count=2048
2048+0 records in
2048+0 records out
2147483648 bytes (2.1 GB) copied, 58.9169 s, 36.4 MB/s

Change file mode (파일 모드 변경)

sudo chmod 600 /var/swapfile

Set up swap area(swap 파일 설정)

~$ sudo mkswap /var/swapfile
Setting up swapspace version 1, size = 2097148 KiB
no label, UUID=969aa5a8-9fd8-4ab3-82b6-e20f23efc081

add to fstab (fstab에 등록)

sudo echo /var/swapfile none swap defaults 0 0 | sudo tee -a /et
c/fstab
/var/swapfile none swap defaults 0 0

~$ cat /etc/fstab
LABEL=cloudimg-rootfs   /        ext4   defaults        0 0

enable file for paging and swapping (swap 실행)

~$ sudo swapon –a

~$ free
             total       used       free     shared    buffers     cached
Mem:        604332     586984      17348          0       5828     521648
-/+ buffers/cache:      59508     544824
Swap:      2097148          0    2097148