centos创建交换分区并自动挂载

一.先创建一个分区
[root@magedu ~]# fdisk /dev/sdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x30783445.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').

Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-261, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-261, default 261): +1G

Command (m for help): t
Selected partition 1
Hex code (type L to list codes): 82
Changed system type of partition 1 to 82 (Linux swap / Solaris)
Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.
好了，现在已经创建出了一个交换分区，最好重启电脑一下。如果不重启，则输入命令；
[root@magedu ~]# partprobe
Warning: WARNING: the kernel failed to re-read the partition table on /dev/sda (Device or resource busy). As a result, it may not reflect all of your changes until after reboot.
Warning: Unable to open /dev/sr0 read-write (Read-only file system). /dev/sr0 has been opened read-only.
让内核重新读取分区表
二：
[root@magedu ~]# mkswap /dev/sdb1
Setting up swapspace version 1, size = 1060252 KiB
no label, UUID=11c8dda0-d607-4aec-81f6-43edff562ec8
获得/dev/sdb1的UUID ，
三：实现自动挂载：
[root@magedu ~]# echo " UUID=11c8dda0-d607-4aec-81f6- 43edff562ec8 swap swap defaults 0 0" >> /etc/fstab
[root@magedu ~]# swapon -a
[root@magedu ~]# swapon -s
FilenameTypeSizeUsedPriority
/dev/sda3 partition10485680-1
/dev/sdb1 partition10602480-2
好了，已经实现了自动挂载
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