Shulou(Shulou.com)06/01 Report--

Linux how to create swap exchange partition, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain in detail for you, people with this need can come to learn, I hope you can gain something.

Create a new disk partition as a swap partition

1. Enter the console (log in to the system) as root and enter

The code is as follows:

# swapoff-a # stop all swap partitions

two。 Partition the disk with the fdisk command (for example: # fdisk / dev/sdb), add the swap partition, create a new partition, change the newly added partition id to 82 (Linux swap type) with the "t" command in fdisk, and finally write the operation to the hard disk with w (the operation before w is invalid).

3.

The code is as follows:

# mkswap / dev/sdb2 # format the swap partition. The sdb2 here depends on the actual partition device name displayed by the p command after you add it.

4.

The code is as follows:

# swapon / dev/sdb2 # start a new swap partition

5. To enable this swap partition automatically when the system boots, edit / etc/fstab and add the following line

The code is as follows:

/ dev/sdb2 swap swap defaults 0 0

Second, resize the swap partition

Sometimes, we need to add swap, for example, to install oracle. Here's how to increase the size of the swap partition.

The code is as follows:

Root@ubuntu:/home/zhangying# free-m

Total used free shared buffers cached

Mem: 3449 3256 193 0 723 1687

/ + buffers/cache: 845 2604

Swap: 254 0 254

The code is as follows:

Root@ubuntu:/home/zhangying# mkdir swap

Root@ubuntu:/home/zhangying# cd swap/

Root@ubuntu:/home/zhangying/swap# dd if=/dev/zero of=swaptmp bs=9024 count=100000

The read-in of 1000000's was recorded.

Recorded the write-out of 1000000: 0.

902400000 bytes (902 MB) replicated, 12.5008 seconds, 72.2 MB/ seconds

The code is as follows:

Root@ubuntu:/home/zhangying/swap# mkswap swaptmp

Mkswap: swaptmp: warning: don't erase bootbits sectors

On whole disk. Use-f to force.

Setting up swapspace version 1, size = 881244 KiB

No label, UUID=ed24d0cc-3af5-4278-b41a-df1ab7433f83

Root@ubuntu:/home/zhangying/swap# swapon swaptmp

Root@ubuntu:/home/zhangying/swap# free-m

Total used free shared buffers cached

Mem: 3449 3359 90 0 637 1930

-/ + buffers/cache: 7912657

Swap: 1115 0 1115

This is only temporary, if you restart the computer, the size of the swap partition is still restored to the original, if you do not want to restore to the original, see the following method.

The code is as follows:

Root@ubuntu:/home/zhangying/swap# swapoff swaptmp

Root@ubuntu:/home/zhangying/swap# rm swaptmp

Root@ubuntu:/home/zhangying/swap# free-m

Total used free shared buffers cached

Mem: 3449 3368 81 0 732 1895

-/ + buffers/cache: 739 2710

Swap: 254 6 248

There is also a situation where this temporary swap becomes non-temporary.

The code is as follows:

Nano / etc/fstab

/ home/zhangying/swap/swaptmp swap swap defaults 0 0

Note: this kind of boot automatically loads, the root load windows under the hard disk is the same, if the swaptmp file is lost, can not increase the size of the swap.

Third, use files as Swap partitions

1. Create a file to be a swap partition: increase the 1GB size of the swap partition, and the command is written as follows, where the count is equal to the number of blocks you want (bs*count= file size).

The code is as follows:

# dd if=/dev/zero of=/root/swapfile bs=1M count=1024

two。 Format to swap partition file:

The code is as follows:

# mkswap / root/swapfile # build the file system of swap

3. Enable swapping partition files:

The code is as follows:

# swapon / root/swapfile # enable swap files

4. To enable the system to power on itself, add a line to the file / etc/fstab:

The code is as follows:

/ root/swapfile swap swap defaults 0 0

The commands used to create and add swap partitions are: mkswap, swapon, etc., while you can use commands such as "swapon / dev/sdb2" to close a swap partition.

The following operation command demonstrates the operation of using a file as a Swap (including some checks before and after).

The code is as follows:

[root@jay-linux] # free-m

Total used free shared buffers cached

Mem: 3979 3179 800 0 266 1873

-/ + buffers/cache: 1039 2940

Swap: 4095 0 4095

The code is as follows:

[root@jay-linux ~] # cat / etc/fstab

# partial output that has nothing to do with the subject has been omitted

/ dev/sda3 swap swap defaults 0 0

The code is as follows:

[root@jay-linux ~] # dd if=/dev/zero of=/root/swapfile bs=1M count=1024

1024000 records in

1024000 records out

1073741824 bytes (1.1GB) copied, 4.09017 s, 263MB/s

[root@jay-linux ~] # mkswap / root/swapfile

Setting up swapspace version 1, size = 1048572 KiB

No label, UUID=48a7ffd5-392f-4963-904c-3e67f0e5dfbe

The code is as follows:

[root@jay-linux ~] # swapon / root/swapfile

[root@jay-linux] # free-m

Total used free shared buffers cached

Mem: 3979 3945 34 0 261 2628

-/ + buffers/cache: 1054 2924

Swap: 5119 0 5119

The code is as follows:

[root@jay-linux ~] # swapoff / dev/sda3

[root@jay-linux] # free-m

Total used free shared buffers cached

Mem: 3979 3945 34 0 261 2629

-/ + buffers/cache: 1053 2925

Swap: 1023 0 1023

The code is as follows:

[root@jay-linux ~] # swapoff / root/swapfile

[root@jay-linux] # free-m

Total used free shared buffers cached

Mem: 3979 3945 34 0 261 2629

-/ + buffers/cache: 1053 2926

Swap: 0 0 0

The code is as follows:

[root@jay-linux ~] # swapon / dev/sda3

[root@jay-linux] # free-m

Total used free shared buffers cached

Mem: 3979 3946 33 0 261 2629

-/ + buffers/cache: 1054 2924

Swap: 4095 0 4095

The code is as follows:

[root@jay-linux] # free-m

Total used free shared buffers cached

Mem: 3979 3179 800 0 266 1873

-/ + buffers/cache: 1039 2940

Swap: 4095 0 4095

The code is as follows:

[root@jay-linux ~] # cat / etc/fstab

# partial output that has nothing to do with the subject has been omitted

/ dev/sda3 swap swap defaults 0 0

The code is as follows:

[root@jay-linux ~] # dd if=/dev/zero of=/root/swapfile bs=1M count=1024

1024000 records in

1024000 records out

1073741824 bytes (1.1GB) copied, 4.09017 s, 263MB/s

[root@jay-linux ~] # mkswap / root/swapfile

Setting up swapspace version 1, size = 1048572 KiB

No label, UUID=48a7ffd5-392f-4963-904c-3e67f0e5dfbe

The code is as follows:

[root@jay-linux ~] # swapon / root/swapfile

[root@jay-linux] # free-m

Total used free shared buffers cached

Mem: 3979 3945 34 0 261 2628

-/ + buffers/cache: 1054 2924

Swap: 5119 0 5119

The code is as follows:

[root@jay-linux ~] # swapoff / dev/sda3

[root@jay-linux] # free-m

Total used free shared buffers cached

Mem: 3979 3945 34 0 261 2629

-/ + buffers/cache: 1053 2925

Swap: 1023 0 1023

The code is as follows:

[root@jay-linux ~] # swapoff / root/swapfile

[root@jay-linux] # free-m

Total used free shared buffers cached

Mem: 3979 3945 34 0 261 2629

-/ + buffers/cache: 1053 2926

Swap: 0 0 0

The code is as follows:

[root@jay-linux ~] # swapon / dev/sda3

[root@jay-linux] # free-m

Total used free shared buffers cached

Mem: 3979 3946 33 0 261 2629

-/ + buffers/cache: 1054 2924

Swap: 4095 0 4095

Is it helpful for you to read the above content? If you want to know more about the relevant knowledge or read more related articles, please follow the industry information channel, thank you for your support.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.