[root@localhost ~]# free
             total       used       free     shared    buffers     cached
Mem:        499304     488388      10916          0      10220     208400
-/+ buffers/cache:     269768     229536
Swap:            0          0          0
[root@localhost ~]# pwd
/root
[root@localhost ~]# mkdir swap
[root@localhost ~]# cd swap
[root@localhost swap]# dd if=/dev/zero f=swapfile bs=1024 count=10000
10000+0 records in
10000+0 records out
10240000 bytes (10 MB) copied, 0.0885569 seconds, 116 MB/s
[root@localhost swap]# ls -al
总计 10036
drwxr-xr-x  2 root root     4096 02-26 22:12 .
drwxr-x--- 19 root root     4096 02-26 22:12 ..
-rw-r--r--  1 root root 10240000 02-26 22:12 swapfile
[root@localhost swap]# mkswap swapfile
Setting up swapspace version 1, size = 10235 kB
[root@localhost swap]# swapon swapfile
[root@localhost swap]# ls -l
总计 10020
-rw-r--r-- 1 root root 10240000 02-26 22:13 swapfile
[root@localhost swap]# free
             total       used       free     shared    buffers     cached
Mem:        499304     490336       8968          0      10672     209964
-/+ buffers/cache:     269700     229604
Swap:         9992          0       9992