# fdisk /dev/vdb

回显信息如下：

Command (m for help): n
Partition type:
   p   primary (0 primary, 0 extended, 4 free)
   e   extended
Select (default p): 
Using default response p
Partition number (1-4, default 1): 
First sector (2048-20971519, default 2048): 
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-20971519, default 20971519): +2G
Partition 1 of type Linux and of size 2 GiB is set
Command (m for help): p

Disk /dev/vdb: 10.7 GB, 10737418240 bytes, 20971520 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 label type: dos
Disk identifier: 0x1f02f438

   Device Boot      Start         End      Blocks   Id  System
/dev/vdb1            2048     4196351     2097152   83  Linux

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

mkswap /dev/vdb1

swapon /dev/vdb1

执行以下命令，查询已启动的swap。

swapon -s

blkid |grep swap |awk '{print $2}'

UUID="1ee90e3c-1538-453b-9240-ad430f835f6f" 

swap的UUID从步骤4.执行以下命令，查询swap分区UUID。获取。本例中执行命令如下。

echo "UUID=1ee90e3c-1538-453b-9240-ad430f835f6f swap swap defaults 0 0" >>/etc/fstab

mount -a