swap 생성

스왑 확인

swapon --summary

스왑 생성

fallocate -l 512M /swapfile
dd if=/dev/zero of=/swapfile bs=1M count=512
chmod 600 /swapfile
ls -a / | grep swapfile

-rw------- 1 root root 536870912 Feb 12 23:55 swapfile

mkswap /swapfile
swapon /swapfile

vim /etc/fstab

/swapfile none swap defaults 0 0

SWAP 파티션은 있는데 SWAP 안 잡혀 있는 경우

fdisk -l /dev/sda

Disk /dev/sda: 256.1 GB, 256060514304 bytes
255 heads, 63 sectors/track, 31130 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0002d1d3

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          26      204800   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              26         548     4194304   82  Linux swap / Solaris
Partition 2 does not end on cylinder boundary.
/dev/sda3             548       31131   245658624   83  Linux
Partition 3 does not end on cylinder boundary.

# mkswap /dev/sda2
Setting up swapspace version 1, size = 4194300 KiB
no label, UUID=9b1ac36a-30ff-4aaf-832d-46ed4b2f56c1
# swapon /dev/sda2

blkid | grep swap
/dev/sda2: UUID="9b1ac36a-30ff-4aaf-832d-46ed4b2f56c1" TYPE="swap"