A brief discussion on the relationship between CPU, memory, virtual memory and hard disk
Everyone knows that assembling a computer requires hardware such as CPU hard disk, memory, etc. The system also contains virtual memory. However, you may not understand the relationship between them! Below, I will introduce the relationship to you in the most concise and easy-to-understand language! CPUCPU is the central processing unit, which is the abbreviation of "CentralProcessingUnit" in English. The CPU fetches instructions from memory or cache, puts them into the instruction register, decodes and decomposes the instructions into a series of micro-operations, and then issues various control commands to execute the micro-operation series to complete the execution of system instructions. Memory However, the CPU cannot directly call the system, programs and data stored on the hard disk. The relevant contents of the hard disk must first be stored in the memory so that it can be read and operated by the CPU.
Jun 20, 2024 pm 01:43 PM
How to use OpenSSL to encrypt and decrypt files
OpenSSL uses cryptographic methods to encrypt or decrypt files 1. Use openssl to encrypt a file (data.zip is the original file, back.zip is the encrypted file) #opensslenc-e-aes256-indata.zip-outback.zip explanation: enc means Symmetrically encrypt or decrypt the file, -e means to encrypt a file, -aes256 means to use the aes256 algorithm for encryption, -in means the file that needs to be encrypted, -out means a new file generated after encryption. During the encryption process, you will be asked to enter an encryption password. Enter it twice to complete the encryption of the file. 2. Use openssl to decrypt.
Jun 20, 2024 am 08:40 AM
The importance of Linux file owner role and permission analysis
Linux is a multi-user, multi-tasking system. Many people often work on one machine at the same time. In order to protect everyone's privacy, the role of the "file owner" becomes very important. When a Linux user logs into the system, he or she will also carry a user identity (UserID, UID) and a user group identity (GroupID, GID), which are equivalent to their own business cards. When you need to access a file or program, you can check whether it can be read, written, and executed by swiping your business card. . Enter ls-l in the root directory to see the following information: Each record consists of 7 parts. The linux file is authorized to the user, with lrwxrwxrwx.1rootroot7Aug1821:27bin->us
Jun 20, 2024 am 07:37 AM
Build an http server on Linux to realize interaction between client and server
There are many services that can be built on Linux. The most basic service is to provide a corresponding socket for the web, allowing the client to obtain network data and realize communication between the client and the server. Especially when building web services on Linux in the era of China Unicom Internet, the mobile client is mainly used to display corresponding information due to its weak calculation ability, and obtain the information that needs to be interpreted through interaction with the web server. This is also a basic application of the web. It is easy to build an http server on Linux. It is more convenient to install software under Linux when installing nginx server. Many organizations maintain a set of software sources. Through the installation command, you will know to download the corresponding application from this software source and install it locally. Installation commands under ubuntu
Jun 20, 2024 am 06:06 AM
Reasons and solutions why CodeBlocks cannot be compiled
CodeBlocks16.01 latest version Baidu Cloud download (installation package includes compiler) https://pan.baidu.com/s/1kWjtmKJCodeBlocks Why can’t I compile? 1. The installation package you downloaded does not contain the compiler. Please go to the Baidu Cloud link shared above to re-download the installation package. 2. You installed CodeBlocks in a drive other than the C drive (such as the D drive, E drive, etc., or although it was installed on the C drive, it was customized to be installed in another directory other than the default directory during installation) , causing the system to be unable to correctly identify the address of the compiler (this may be a design flaw in the software itself). Please try uninstalling and reinstalling, and install the software on the C drive during installation.
Jun 20, 2024 am 12:17 AM
Teach you how to use the Head plug-in in Elasticsearch
For basic environment Elasticsearch cluster construction, please refer to the previous article http://www.cnblogs.com/aubin/p/8012840.html System node name IP software version CentOS7.3els1172.18.68.11Elasticsearch6.0CentOS7.3els2172.18.68.12Elasticsearch6. 0CentOS7.3els3172.18.68.13Elasticsearch6.0 1. Install the plug-in official website address https://github.com/mobz/elasticsea
Jun 19, 2024 pm 01:31 PM
rar software decompression installation package and connection command tutorial
Ⅱ Unzip the installation package============================================== ====================The rar software does not need to be installed. Decompress the linux Eden Forum directly, for example, decompress it to /usr/local: tarzxvfrarlinux-x64-4.2.0.tar .gz-C/usr/localⅢ connection command ========================================== =========================After decompression is completed, in /usr/local/rar
Jun 19, 2024 am 09:34 AM
A brief history of data center network technology
The data center network is actually a local area network, with two major parts: data and storage: the storage network is mainly FC technology, and now IPSAN, storage based on Ethernet IP forwarding, has appeared. Overall, the technology of storage networks is not developing very fast, and there are many tricks. Not so much that no one talks about it to this day. Data is a larger part of the data center network, mainly Ethernet network protocols. Looking through the RFC, it is not difficult to find that there are too many network protocols and features of Ethernet. The development of these protocols is actually the history of network technology. Each of them The protocols are constantly being improved, and after practical application, they are constantly being repaired. Of course, there are also some protocols that are not applicable and have been abandoned early. Few people update and improve them. Here, we are not trying to reconstruct the development history of network technology.
Jun 19, 2024 am 09:21 AM
Explore typing games under Linux: Introduction to source code and full-stack development
Typing game under linux The next game under linux, with program source code java key typing game source code-MSIKLM: Use Linux to control the SteelSeries keys of your MSI gaming computer java key typing game source code The usual MSI key light manager (MSIKLM ) is an easy-to-use tool that allows you to configure SteelSeries keys for MSI gaming computers on Linux/Unix. The method is almost the same as the configuration of SteelSeriesEngine on Windows... python from entry to full stack development · Getting started At the same time, python can also be used as an APP
Jun 19, 2024 am 08:59 AM
Linux system permissions analysis: permission classification and representation methods of ordinary files and directories
The Linux system has many permissions. Although the purpose is to serve user security and make it more difficult to understand, here I will summarize the permissions of Linux according to file types. 1. Ordinary files and directories. For ordinary files and directories on the Linux system, there are three Types of permissions: rwx permissions, hidden attribute permissions and ACL permissions 1. rwx permissions (1) Use numbers to represent rwx permissions. r represents read permission; w represents write permission; x represents execution permission. The Linux system has three identities: owner (u), group (g) and other people (o). The Linux system uses 0 to indicate that permissions are turned off, and 1 to indicate that permissions are turned on. So how to install LINUX for any file? All possible combinations of owner permissions are 8
Jun 18, 2024 pm 03:50 PM
How to switch from root to ordinary user to execute scripts or commands in Linux and solve related problems
How to switch from root to ordinary user to execute script or command in linuxshell script. Tomorrow I will share with you an article about how to switch from root to ordinary user to execute script or command in linuxshell script. It has a good reference value. I hope it will be helpful to you. Helps. Let’s follow the editor and take a look. Forgetting the root password in Linux and entering single-user mode to switch run levels and switching users mainly introduces Linux. Forgetting the root password and entering single-user mode to switch run levels and switch users. Students in need can refer to the Linux ordinary user suroot. The solution to the problem that the switch prompts that there is no file or directory mainly introduces the solution for the suroot switch prompt of ordinary Linux users that there is no file or directory.
Jun 17, 2024 am 09:23 AM
Ideas for installing Centos7 on a physical computer and U disk boot installation method
Applications in enterprises usually run on: chemical server virtual machine (cloud host) container. Now novices who just learn Linux usually install vmwareworkstation in the windows system, and then install the vmware virtual machine to use and learn. But when I encounter the steps to install Linux system on a chemical notebook or server CD, I don’t know how to install Linux. Let’s explain the idea of installing centos7 on a chemical notebook. There are several main ways to install centos on a chemical machine: 1. U disk boot installation 2. CD boot installation 3. Network boot installation Many notebooks nowadays are no longer equipped with hard drives, so the second method is excluded. You can consider cobb as a network installation method
Jun 17, 2024 am 09:14 AM
Teach you how to capture kernel crash information
First install the required package: apt-get-yinstallaptitudekdump-toolscrashkexec-toolsmakedumpfilelinux-image-`uname-r`-dbgaptitudefull-upgrade# Avoid inconsistency between the running kernel version and the debugged version, resulting in the inability to debug the Kdump configuration file /etc/default/kdump -tools key part USE_KDUMP=1KDUMP_SYSCTL="kernel.panic_on_oops=1"KDUMP_KERNEL=/
Jun 16, 2024 pm 10:34 PM
How do I install software and set environment variables with non-root user rights?
In the case of the article directory, use the root user linux. Use the root user linux compression command. Since the permissions are large enough, everything can be done easily by non-root users. What about the Linux system when the permissions are low, even yuminstall cannot be used, so how to install the software? Installation rpm package 1. Taking the installation of the wget tool as an example, first download a wget rpm package on the windows browser http://www.rpmfind.net/linux/centos/7.9.2009/os/x86_64/Packages/wget-1.14- Simulate offline installation after 18.el7_6.1.x86_64.rpm
Jun 16, 2024 pm 03:51 PM
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