Linux添加swap分区的方法

建立一个普通的linux分区（主分区、逻辑分区均可）

fdisk /dev/sdb

command (m for help): p

disk /dev/sdb: 8589 mb, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders, total 16777216 sectors
units = sectors of 1 * 512 = 512 bytes
sector size (logical/physical): 512 bytes / 512 bytes
i/o size (minimum/optimal): 512 bytes / 512 bytes
disk identifier: 0x740e36e3
  device boot   start     end   blocks  id system
/dev/sdb1       63   4194367   2097152+ 83 linux
/dev/sdb2     4194368  16777215   6291424  5 extended
/dev/sdb5     4194431   8388735   2097152+ 83 linux
/dev/sdb6     8388799  16777215   4194208+ 83 linux

以sdb6为例，可以看到分区的十六进制编码是83，即普通的linux分区。

修改分区类型的十六进制编码

//t命令：改写分区十六进制编码
command (m for help): t 
partition number (1-6): 6
//l命令可以查看不同分区的十六进制编码，交换分区为82
hex code (type l to list codes): 82
changed system type of partition 6 to 82 (linux swap / solaris)
command (m for help): p
disk /dev/sdb: 8589 mb, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders, total 16777216 sectors
units = sectors of 1 * 512 = 512 bytes
sector size (logical/physical): 512 bytes / 512 bytes
i/o size (minimum/optimal): 512 bytes / 512 bytes
disk identifier: 0x740e36e3
  device boot   start     end   blocks  id system
/dev/sdb1       63   4194367   2097152+ 83 linux
/dev/sdb2     4194368  16777215   6291424  5 extended
/dev/sdb5     4194431   8388735   2097152+ 83 linux
/dev/sdb6     8388799  16777215   4194208+ 82 linux swap / solaris
//分区表写入磁盘并退出
command (m for help): w
the partition table has been altered!
calling ioctl() to re-read partition table.
syncing disks.

格式化交换分区

mkswap /dev/sdb6
setting up swapspace version 1, size = 4194204 kib
no label, uuid=40eff2c0-3f6b-440e-bc2a-f71d3d5581a7

启用交换分区

swapon /dev/sdb6

查看交换分区加载状态

free
       total    used    free   shared  buffers   cached
mem:    1030108   160768   869340    264   12040   56188
-/+ buffers/cache:   92540   937568
swap:   6291352     0  6291352

停用交换分区

swapoff /dev/sdb6

p.s.

不能直接使用mount命令挂载swap分区，因为swap分区是没有挂载点的。

直接修改/etc/fstab配置文件，使系统启动时自动挂载：

/dev/sdb6        swap          swap  defaults    0 0
//查看交换分区
 swapon -s
filename        type    size  used  priority
/dev/sda2                partition  2097148 0  -1
/dev/sdb6                partition  4194204 0  -2

总结

以上所述是小编给大家介绍的linux添加swap分区的方法，希望对大家有所帮助