1.当系统中磁盘不能再分区时，可以通过dd命令创建一个较大的文件，然后用文件构建交换分区
查看当前的交换分区
[root@zhu1 ~]# free -m total used free shared buffers cached Mem: 514 508 6 0 115 192 -/+ buffers/cache: 200 314 Swap: 1498 0 1498
2.dd命令创建一个1G的文件
[root@zhu1 ~]# dd if=/dev/zero of=/root/swapfile bs=1M count=1024 1024+0 records in 1024+0 records out 1073741824 bytes (1.1 GB) copied, 16.1442 seconds, 66.5 MB/s
3.格式化为交换分区
[root@zhu1 ~]# mkswap /root/swapfile Setting up swapspace version 1, size = 1073737 kB
4.启动交换分区
[root@zhu1 ~]# free -m total used free shared buffers cached Mem: 514 503 10 0 1 405 -/+ buffers/cache: 96 418 Swap: 1498 0 1497 [root@zhu1 ~]# swapon /root/swapfile [root@zhu1 ~]# free -m total used free shared buffers cached Mem: 514 504 10 0 1 406 -/+ buffers/cache: 96 418 Swap: 2522 0 2521 [root@zhu1 ~]# swapon -s Filename Type Size Used Priority /dev/hda2 partition 1534196 1004 -1 /root/swapfile file 1048568 0 -2
5.设置自动挂载
[root@zhu1 ~]# vim /etc/fstab LABEL=/ / ext3 defaults 1 1 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-hda2 swap swap defaults 0 0 /root/swapfile swap swap defaults 0 0 ~
当该交换分区不需要时可关闭并删除
[root@zhu1 ~]# swapoff /root/swapfile [root@zhu1 ~]# rm /root/swapfile [root@zhu1 ~]# free -m total used free shared buffers cached Mem: 514 107 407 0 1 14 -/+ buffers/cache: 91 423 Swap: 1498 0 1497
