Shulou(Shulou.com)06/02 Report--

This article shows you how to carry out the analysis of dd command backup Linux system, the content is concise and easy to understand, can definitely make your eyes bright, through the detailed introduction of this article, I hope you can get something.

The loss caused by data loss is quite expensive. The loss of critical data will have an impact on enterprises of all sizes. There are several ways to back up Linux systems, including rsync and rsnapshot. This article provides six examples of backing up a Linux system using the dd command. Dd is a powerful UNIX tool that is booted by the makefile of the Linux kernel and can also be used to copy data.

* * example 1: VR backup the entire hard disk

Use the dd command to back up the entire hard drive. In this example, the device name of the source hard disk is / dev/ sda, and the device name of the destination hard disk is / dev/ sdb. Execute the dd command to back up the entire hard drive / dev/sha to another hard drive / dev/sdb on the same system. As follows:

[root@linuxprobe ~] # dd if=/dev/sda of=/dev/sdb- "if" followed by the input file, and "of" followed by the output file. -any errors in the execution of the above command will fail. However, if you add the parameter "CONV= NOERROR", it will continue to copy even if there is an error in the execution. -input and output files must be checked repeatedly before execution. If the order of the two files is reversed, you may lose all your data.

When backing up the entire hard drive, we can also add the sync parameter to synchronize Icano. As follows:

[root@linuxprobe ~] # dd if=/dev/sda of=/dev/sdb conv=noerror,sync

**

**

* * example 2: create an image of a hard disk

Use the dd command to create an image file for the hard drive and save it to another storage device. This backup method has many advantages: one is easy to use, the other is that this backup method is faster than other methods of backup, but also allows you to recover data more quickly.

Create an image command for hard disk / dev/sda:

[root@linuxprobe ~] # dd if=sdadisk.img of=/dev/sdb

* * example 3: restore hard disk image files and restore data

Use the dd command to restore the image file of the hard drive to another hard drive. As follows:

[root@linuxprobe ~] # dd if=/dev/fd0 of=myfloppy.img

The Sdadisk.img file is the image of / dev/sda, so the above command will restore the image of / dev/had to / dev/sdb

* * example 4: create a floppy disk image

Use the dd command to create an image backup of the floppy disk. The input file fills in the location of the floppy drive device, and the output file writes the name of the floppy disk image file, as shown below.

[root@linuxprobe ~] # dd if=/dev/sda1 of=~/partition1.img

**

**

* * example 5 VRU backup partition

Use the dd command to back up the hard drive partition. Enter the file to fill in the device name of the partition, and the output file to fill in the target path or image file you specified. An example of the dd command is as follows:

[root@linuxprobe ~] # dd if=/dev/sda1 of=~/partition1.img

* * example 6 is backed up by CD-ROM.

The dd command allows us to create an iso file of the source file, so we can insert CD and enter the dd command to create a CD iso file content.

[root@linuxprobe ~] # dd if=/dev/cdrom of=tgsservice.iso bs=2048

The dd command reads a block from the input and writes it to the output file. You can specify the block size of the input and output files. The parameter "bs" specifies the block size of the input and output files. The above dd command uses a block size of 2048 bytes.

Note: if the disc is mounted automatically, it is best to drop umount before using the dd command to create an iso image to avoid unnecessary access to the CD ROM.

What is Linux system Linux is a free-to-use and free-spread UNIX-like operating system, is a POSIX-based multi-user, multi-task, multi-threaded and multi-CPU operating system, using Linux can run major Unix tools, applications and network protocols.

The above content is how to analyze the dd command backup Linux system. Have you learned the knowledge or skills? If you want to learn more skills or enrich your knowledge reserve, you are welcome to follow the industry information channel.

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.