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This article mainly explains "what is the concept of uuid in linux". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "what is the concept of uuid in linux".

In linux, uuid is the universal unique identification number. Uuid is a standard for software construction, which aims to enable all elements used in a distributed system to have unique identification information, so that there is no need to specify identification information through a central control terminal.

The operating environment of this tutorial: linux7.3 system, Dell G3 computer.

What is uuid in linux

1 introduction

UUID means universal unique identification number (Universally Unique Identifier), which is a standard for software construction and is part of the field of distributed computing environment (Distributed Computing Environment, DCE) used by organizations of the Open Source Software Foundation (Open Software Foundation, OSF).

2 function

The purpose of UUID is to enable all elements in a distributed system to have unique identification information without the need to specify identification information through the central control terminal. In this way, everyone can build a UUID that does not conflict with others. In this case, there is no need to consider the problem of name duplication when the database is established. At present, the most widely used UUID is Microsoft's Microsoft's Globally Unique Identifiers (GUIDs), while other important applications are Linux ext2/ext3 file system, LUKS encryption partition, GNOME, KDE, Mac OS X and so on.

3 composition

UUID is a number generated on a machine that is guaranteed to be unique to all machines in the same space-time. Typically, the platform provides the generated API. According to the standard developed by the Open Software Foundation (OSF), the Ethernet card address, nanosecond time, chip ID code and many possible numbers are used.

UUID consists of a combination of the following parts:

(1) current date and time, the first part of UUID is related to time. If you generate a UUID and then generate a UUID in a few seconds, the first part is different and the rest are the same.

(2) clock sequence.

(3) the globally unique IEEE machine identification number, if there is a network card, it is obtained from the MAC address of the network card, and no network card is obtained by other means.

The only drawback of UUID is that the resulting string is relatively long. The most commonly used standard about UUID is Microsoft's GUID (Globals Unique Identifiers). In ColdFusion, you can simply generate UUID with the CreateUUID () function in the format: xxxxxxxx-xxxx- xxxx-xxxxxxxxxxxxxxxx (8-4-4-16), where each x is a hexadecimal number in the range of 0-9 or Amurf. The standard UUID format is xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxx (8-4-4-4-12), which can be converted by downloading CreateGUID () UDF from cflib.

4 Application

The benefits of using UUID can be reflected in distributed software systems (such as DCE/RPC, COM+,CORBA), it can ensure that the identity generated by each node will not be repeated, and with the development of integration technologies such as WEB services, the advantages of UUID will be more obvious. Depending on the specific mechanism used, UUID not only needs to be guaranteed to be different from each other, or at least very different from any other universal unique identifiers generated before AD 3400.

Universal unique identifiers can also be used to point to most possible objects. Microsoft and other software companies tend to use globally unique identifiers (GUID), a type of universal unique identifiers that can be used to point to component object module objects and other software components. The first universal unique identifier was created in a network computer system (NCS) and subsequently became a component of the Open Software Foundation (OSF) distributed computing environment (DCE).

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