linux-添加swap分区-129
Linux 添加交换分区
系统环境：
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[root@CentOS-5 ~]# cat /etc/redhat-release
CentOS release 5.7 (Final)
[root@CentOS-5 ~]# uname -rv
2.6.18-274.7.1.el5 #1 SMP Thu Oct 20 16:21:01 EDT 2011
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1.通过添加分区实现
[root@CentOS-5 ~]# fdisk -l /dev/sdb
[root@CentOS-5 ~]# fdisk /dev/sdb -----添加新的分区
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-391, default 1): 1
Last cylinder or +size or +sizeM or +sizeK (1-391, default 391): 100
Command (m for help): t ------t change a partition's system id
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
[root@CentOS-5 ~]# mkswap /dev/sdb1 -----格式化分区
[root@CentOS-5 ~]# swapon /dev/sdb1 ----添加建好的分区
[root@CentOS-5 ~]# swapon -s
Filename Type Size Used Priority
/dev/sda2 partition 1052248 0 -1
/dev/sdb1 partition 803208 0 -2
[root@CentOS-5 ~]# vim /etc/fstab ----写入开机启动
/dev/sdb1 none swap defaults 0 0
[root@CentOS-5 ~]# mount -a -o remount
2.通过添加文件实现
[root@CentOS-5 ~]# dd if=/dev/zero of=/opt/swap_file bs=4M count=25
[root@CentOS-5 ~]# mkswap /opt/swap_file
Setting up swapspace version 1, size = 104853 kB
[root@CentOS-5 ~]# swapon /opt/swap_file
[root@CentOS-5 ~]# swapon -s
Filename Type Size Used Priority
/opt/swap_file file 102392 0 -3
[root@CentOS-5 ~]# echo '/opt/swap_file none swap defaults 0 0' >>/etc/fstab
[root@CentOS-5 ~]# mount -a -o remount
[root@CentOS-5 ~]# cat /proc/swaps
Filename Type Size Used Priority
/dev/sda2 partition 1052248 0 -1
/dev/sdb1 partition 803208 0 -2
/opt/swap_file file 102392 0 -3
[root@CentOS-5 ~]#