redhat 虚拟机增加swap

[code][root@localhost ~]# cd /u01
[root@localhost u01]# ls
lost+found
[root@localhost u01]# mkdir swap
[root@localhost u01]# cd swap/
[root@localhost swap]# free
total used free shared buffers cached
Mem: 1035140 354648 680492 0 27896 274304
-/+ buffers/cache: 52448 982692
Swap: 0 0 0
[root@localhost swap]# dd if=/dev/zero of=swapfile bs=102400 count=10000
10000+0 records in
10000+0 records out
1024000000 bytes (1.0 GB) copied, 10.1126 seconds, 101 MB/s
[root@localhost swap]# mkswap swapfile
Setting up swapspace version 1, size = 1023995 kB
[root@localhost swap]# swapon swapfile
[root@localhost swap]# free
total used free shared buffers cached
Mem: 1035140 1021260 13880 0 10312 945524
-/+ buffers/cache: 65424 969716
Swap: 999992 0 999992
[root@localhost swap]# df -hT
Filesystem Type Size Used Avail Use% Mounted on
/dev/sda2 ext3 9.5G 8.6G 409M 96% /
/dev/sda3 ext3 2.0G 490M 1.4G 27% /tmp
/dev/sda1 ext3 99M 12M 83M 12% /boot
tmpfs tmpfs 506M 0 506M 0% /dev/shm
share vboxsf 465G 260G 206G 56% /media/sf_share
/dev/sda4 ext2 8.0G 996M 6.7G 13% /u01
[root@localhost swap]#[/code]
添加到fstab，开机自动挂载
[code][root@localhost swap]# cat /etc/fstab
LABEL=/ / ext3 defaults 1 1
LABEL=/tmp /tmp ext3 defaults 1 2
LABEL=/boot /boot ext3 defaults 1 2
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
LABEL=SWAP-sda5 swap swap defaults 0 0
/dev/sda4 /u01 ext2 defaults 0 0
/u01/swap/swapfile swap swap defaults 0 0[/code]