Linux image file refers to storing the data on the memory and the storage address information in a file; for example, the data on the hard disk is made into an image file, and the content of this file is the data of the partition when the image is made. , the contents of the image can be restored intact to the hard disk through the corresponding software.
#The operating environment of this tutorial: linux5.9.8 system, Dell G3 computer.
What is an image file in Linux?
Image file and image file
Image file (Image) and image file generally have the same concept, and they are both called Image in English. If you have to subdivide them, There are the following differences:
(1) Image file:
Store the data and storage address information on the external storage in a file, such as Ghost. The image file contains a lot of information. In addition to the data itself, it also contains system files, boot files, partition table information, etc. In this way, the image file can contain all the information of a partition or even a hard disk. Common image file formats include ISO, IMG, BIN, TAO, DAO, CIF, and FCD.
(2) Image file:
Store the data and storage address information on the memory in a file, such as the Linux boot loader file. For example, the data on the hard disk (can be a partition or the entire hard disk) is made into a file (image file). The content of this file is the data of the partition (hard disk) when the image is made. The contents of the image can be restored intact to the hard disk through the corresponding software.
(3) Mirror website:
Put an identical site on several servers and each has its own URL. These sites are mirror websites of each other. It is not much different from the main site. It can be regarded as a backup of the main site. The purpose is to ensure that there are multiple copies of the same data, so that if there is a problem with a certain copy, the data will not be lost or It's easy to recover. When users cannot access the main site, they can access these mirror sites to obtain the same site data. Mirror websites can divert traffic and reduce server pressure. However, this method is generally only adopted when the server cannot accept too many visits. Commercial websites generally do not use this method because users have to remember two domain names and upload content twice. , Keep the two places consistent at all times.
(4) The mobile phone simulator needs to use SD card mirroring to simulate the SD card:
Copy the data on the external SD card intact to the hard disk. , and compressed into an image file. Then mount this image file through virtual software (eg: virtual optical drive software), so that operating the image file through the virtual software is like operating an SD card.
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