1.查看系统Swap空间使用
[root@jumper usr]# free
total used free shared buffers cached
Mem: 513980 493640 20340 0 143808 271780
-/+ buffers/cache: 78052 435928
Swap: 1052248 21256 1030992
2.在空间合适处创建swap文件
[root@jumper usr]# mkdir swap
[root@jumper usr]# cd swap
[root@jumper swap]# dd if=/dev/zero of=swapfile bs=1024 count=10000
10000+0 records in
10000+0 records out
[root@jumper swap]# ls -al
total 10024
drwxr-xr-x 2 root root 4096 7月 28 14:58 .
drwxr-xr-x 19 root root 4096 7月 28 14:57 ..
-rw-r--r-- 1 root root 10240000 7月 28 14:58 swapfile
[root@jumper swap]# mkswap swapfile
Setting up swapspace version 1, size = 9996 KiB
3.激活swap文件
[root@jumper swap]# swapon swapfile
[root@jumper swap]# ls -l
total 10016
-rw-r--r-- 1 root root 10240000 7月 28 14:58 swapfile
[root@jumper swap]# free
total used free shared buffers cached
Mem: 513980 505052 8928 0 143900 282288
-/+ buffers/cache: 78864 435116
Swap: 1062240 21256 1040984
[root@jumper swap]#