1创建所需swap空间的文件

　　　　　　　　　　　　if=获取数据　 of=输出位置　 　块大小(每次复制大小)　　块个数（复制次数）　　 [root@web01 ~]# dd if=/dev/zero of=/tmp/100m　　 bs=1M 　　　　　　count=100100+0 records in100+0 records out104857600 bytes (105 MB) copied, 2.01386 s, 52.1 MB/s [root@web01 ~]# ll -h /tmp/100m -rw-r--r--. 1 root root 100M Apr 21 13:44 /tmp/100m

2 格式化文件成为SWAP

[root@web01 ~]# mkswap  /tmp/100m mkswap: /tmp/100m: warning: don't erase bootbits sectors        on whole disk. Use -f to force.Setting up swapspace version 1, size = 102396 KiBno label, UUID=f90d8d0c-4972-42fc-83f8-4b98c651554e[root@web01 ~]# file /tmp/100m   查看文件类型是否更改为swap/tmp/100m: Linux/i386 swap file (new style) 1 (4K pages) size 25599 pages

3 让文件生效成SWAP

[root@web01 ~]# free -h                 total       used       free     shared    buffers     cachedMem:          3.7G       2.2G       1.6G       232K       1.0G       164M-/+ buffers/cache:       972M       2.8GSwap:         1.5G         0B       1.5G [root@web01 ~]# swapon /tmp/100m [root@web01 ~]# free -h total       used       free     shared    buffers     cached Mem:          3.7G       2.2G       1.6G       232K       1.0G       164M -/+ buffers/cache:       972M       2.8G Swap:         1.6G         0B       1.6G

4 检查swap 是由及部分组成

[root@web01 ~]# swapon -sFilename                Type        Size    Used    Priority/dev/sda2               partition   1048572   0      -1/tmp/500m               file        511996    0      -2/tmp/100m               file        102396    0      -3

5 永久挂载/开机挂载

方法1：写入 /etc/rc.local [root@web01 ~]# cat /etc/rc.local#!/bin/sh## This script will be executed *after* all the other init scripts.# You can put your own initialization stuff in here if you don't# want to do the full Sys V style init stuff.touch /var/lock/subsys/local#bin/mount    /dev/sdc1    /dateswapon        /tmp/100m 方法2 [root@web01 ~]# cat /etc/fstab /tmp/100m		swap			swap	defaults	0 0