Building of Memory swap space (swap)

First, using physical partitions to build swap

1, the first partition of the behavior.

1[Email protected] ~]# fdisk/dev/Xvdb2Welcome to Fdisk (util-linux2.23.2).3 4Changes'll remaininchMemory only,untilYou decide toWritethem.5Be careful before using theWritecommand.6 7 8Command (M forHelp ): N9 Partition Type:TenP Primary (1Primary0Extended3  Free) One e Extended A Select (default p): P -Partition Number (1,3,4, default1):4 -First Sector (20973568-62914559, default20973568):  theUsing Default Value20973568 -Last sector, +sectors or +size{k,m,g} (20973568-62914559, default62914559): +512m -Partition4of type Linux and of sizeTenGiB is set -  +Command (M forHelp ): P -  +DISK/DEV/XVDB:32.2GB,32212254720bytes62914560Sectors AUnits = sectors of1* += +bytes atSector size (logical/physical): +Bytes/ +bytes -I/O size (minimum/optimal): +Bytes/ +bytes - Disk label Type:dos -Disk identifier:0x25a2caf5 -  - Device Boot Start End Blocks Id System in/dev/xvdb22048    20973567    10485760    theLinux -/dev/xvdb420973568    41945087    10485760    theLinux to  +Command (M forHelp ): T <== modify the System ID -Partition Number (2,4, default4):4 theHex code (type L to list all codes):the ID of the <== changed to swap *Changed type of partition'Linux'To'Linux Swap/solaris' $ Panax NotoginsengCommand (M forHelp ): P -  theDISK/DEV/XVDB:32.2GB,32212254720bytes62914560Sectors +Units = sectors of1* += +bytes ASector size (logical/physical): +Bytes/ +bytes theI/O size (minimum/optimal): +Bytes/ +bytes + Disk label Type:dos -Disk identifier:0x25a2caf5 $  $ Device Boot Start End Blocks Id System -/dev/xvdb22048    20973567    10485760    theLinux -/dev/xvdb420973568    41945087    10485760    theLinux Swap/Solaris the  -Command (M forHelp):WWuyiThe partition table has been altered! the  -Calling IOCTL () to re-read partition table. WuSyncing disks.

Force kernel update partition table:

[Email protected] ~]# Partprobe

2. Start building swap format.

[Email protected] ~]# mkswap/dev/15485756  kibno label, UUID=033a1d75-88fd-  4347-8726-08d856cb9ad1

3. Check and load.

1[Email protected] ~]# swapon/dev/XVDB42[Email protected] ~]# Free3Total used Freeshared buffers Cached4Mem:1016656     152956     863700       6624      11036      758285-/+ Buffers/cache:66092     9505646Swap:10485756          0   10485756

[Email protected] ~]# swapon-sfilename                Type        Size    used    priority/DEV/XVDB4                                 Partition    10485756    0    -1

Ii. using a file system to build swap

1, use the DD command to add a 128MB file under/data:

1 DD if=/dev/zero of=/data/swap bs=1m count=2+0in3  +0  Recordsout 4536870912 bytes (537  7.8214968.6 MB/s

2, using Mkswap will/data/swap this file format swap file format:

1 [[email protected] ~]# mkswap/data/21524284  KiB3 No Label, UUID=EDE63D44-CF78-4D08-92CA-15FB38A625F4

3, use Swapon to start the/data/swap

1[Email protected] ~]# swapon/data/Swap2Swapon:/data/swap:insecure Permissions0644,0600suggested.3[Email protected] ~]# Free-m4Total used Freeshared buffers Cached5Mem:992        670        322          6          One        5866-/+ Buffers/cache: the        9197Swap:511          0        5118[Email protected] ~]# Swapon-s9 Filename Type Size used priorityTen/data/swapfile    524284    0-1

Use Swapoff to turn off Swapfile

1 [[email protected] ~]# swapoff/dev/xvdb42

To enable swap to mount automatically, modify the/etc/fstab file

At the end of the file, add

/data/swap Swap swap default 0 0
This way, the swap partition does not have to be mounted manually, even if the system is restarted.

Building of Memory swap space (swap)