一、使用fdisk 在设备上创建swap分区。
1.创建分区
Command (m for help): n
Command action
l logical (5 or over)
p primary partition (1-4)
l
First cylinder (641-1566, default 641):
Using default value 641
Last cylinder or +size or +sizeM or +sizeK (641-890, default 890):
Using default value 890
Command (m for help): p
Disk /dev/sda: 12.8 GB, 12884901888 bytes
255 heads, 63 sectors/track, 1566 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 6 48163+ 83 Linux
/dev/sda2 7 515 4088542+ 83 Linux
/dev/sda3 516 1566 8442157+ 5 Extended
/dev/sda5 891 1015 1004031 83 Linux
/dev/sda6 1016 1566 4425876 83 Linux
/dev/sda7 516 640 1004031 83 Linux
/dev/sda8 641 890 2008093+ 83 Linux
2.指定分区类型为linux swap。这里的/dev/sda5就是我们要做swap的分区。
Command (m for help): t
Partition number (1-8): 5
Hex code (type L to list codes): 82
Command (m for help): p
Disk /dev/sda: 12.8 GB, 12884901888 bytes
255 heads, 63 sectors/track, 1566 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot
Start
End
Blocks
Id
System
/dev/sda1
*
1
6
48163+
83
Linux
/dev/sda2
7
515
4088542+
83
Linux
/dev/sda3
516
1566
8442157+
5
Extended
/dev/sda5
516
640
1004031
82
Linux swap
/dev/sda6
641
890
2008093+
83
Linux
/dev/sda7
891
1015
1004031
83
Linux
/dev/sda8
1016
1566
4425876
83
Linux
3.使用mkswap命令设置交换分区[
root@libydwei /]# mkswap /dev/sda5
Setting up swapspace version 1, size = 1028120 kB
4.swapon 激活swap分区
[
root@libydwei /]# swapon /dev/sda5
5.为了能够在系统启动是自动挂载。我们可以编辑/etc/fstab配置文件。在文件末尾增加:
/dev/sda5 swap swap defaults 0 0
二、使用文件创建swap分区
bs blocksize ,每个块大小为1k.count=2048000。则总大小为2G的文件。
1. dd if=/dev/zero of=/swapfile bs=1k count=2048000
2. mkswap /swapfile
3. swapon /swapfile
4. 修改/etc/fstab使其启动时自动mount:
在/etc/fstab中增加如下语句:
/swapfile swap swap defaults 0 0