Do you know the simple way to check IP in Linux system?
A simple way to check IP in Linux system In Linux system, we generally know that IP is the network address Linux space on the computer, and it is not easy to know how to check IP. Sometimes, we need to check the IP either logged in to the local machine or the remote server. So, next we will introduce a simple way to check the IP in the Linux system. 1. Use the ifconfig command. The ifconfig command is the most commonly used tool in Linux for viewing IP addresses. This command comes with most distributions of Linux. Through the ifconfig command, we can see the network of all network cards on the machine. information, as well as associated status, such as IP, subnet segment, etc., and you want to check
Jul 20, 2024 am 06:32 AM
Mariadb learning summary (5): database table constraints and three paradigms
The three major database paradigms (NF): When designing a relational database, follow different normative requirements to design a reasonable relational database. These different normative requirements are called different paradigms. Various paradigms present sub-norms, the higher the The less redundant the paradigm database is. However, sometimes blindly pursuing paradigms to reduce redundancy will actually reduce the efficiency of data reading and writing. At this time, it is necessary to reverse the paradigm and use space to trade time. It can be roughly understood as the level of a certain design standard that the table structure of a data table conforms to. 1NF means that the columns of the table are atomic and cannot be decomposed, that is, the column information cannot be decomposed, as long as the database is a relational database (mysql/oracle/db2/informix/sysbase/sq
Jul 20, 2024 am 03:00 AM
Detailed steps to solve slow SSH login in Linux system
When we installed the Linux system, we did not close a service. As a result, we had to wait for a while before entering the password after entering the user name when logging in to SSH. The following solutions can be summarized to solve this problem. Modify the following two places in sshd_config and restart ssh. #vi/etc/ssh/sshd_configGSSAPIAuthenticationnoUseDNSnoRestart ssh#systemctlrestartsshd The above can be solved perfectly.
Jul 19, 2024 pm 08:58 PM
toss! Running DOS on Raspberry Pi
Different CPU architectures mean that running DOS on the Raspberry Pi is not easy, but it is not much trouble. FreeDOS may be familiar to everyone. It is a complete, free and well-compatible operating system for DOS. It can run some older DOS games or commercial software, and can also develop embedded applications. As long as the program can run on MS-DOS, it can run on FreeDOS. As the initiator and project coordinator of FreeDOS, many users will ask me questions as an insider. The question I get asked most often is: "Can FreeDOS run on a Raspberry Pi?" This question is not surprising. After all, Linux runs very well on the Raspberry Pi
Jul 19, 2024 pm 05:23 PM
Detailed explanation on the installation and use of rz and sz commands to transfer files
To use rz and sz commands to transfer files, you need to install lrzsz on the server: yum-yinstall lrzsz command sz, rz usage method. The r in rz means received. When rz is entered, it means the server receives the file, and the official file is uploaded locally. to the server. The s in sz means send. When sz is entered, it means that the server wants to send files, that is, it sends files from the server to the local, or the local downloads files from the server. Note: Whether it is send or received, the action is initiated on the server. rz usage: Note: When uploading, if the linux directory uploaded to has a file with the same name, it will be difficult to upload. You need to delete lin first.
Jul 19, 2024 pm 04:49 PM
Timer Timer's various application methods and advantages and disadvantages under Linux
Timer Timer has a wide range of application scenarios. There are several ways to apply timers in Linux under Linux: 1. Hongqi Linux desktop version, using sleep() and usleep(). The sleep accuracy is one second, and the usleep accuracy is 1 microsecond. Specifically No more code is written. The disadvantages of using these techniques are obvious. In Linux systems, sleep functions cannot guarantee accuracy. Especially when the system load is relatively heavy, sleep usually times out. 2. The accuracy of these methods using the semaphore SIGALRM+alarm() can reach one second. With the help of the semaphore mechanism of the *nix system, first register the semaphore SIGALRM processing function and call ala
Jul 19, 2024 pm 03:52 PM
Analysis of the maximum number of concurrent TCP connections and identification methods for a single machine in network programming
In network programming, in TCP applications, the server eavesdrops on a fixed port in advance, the client actively initiates a connection, and a TCP connection is established after a three-way handshake. What is the maximum number of concurrent TCP connections for a single machine? How to mark a TCP connection. Before determining the maximum number of connections, let's first take a look at how the system marks a TCP connection. The system uses a 4-tuple to uniquely identify a TCP connection: {localip, localport, remoteip, remoteport}. Maximum number of TCP connections for a client. Each time a client initiates a TCP connection request, unless the port is bound, the system will generally select an idle local port (localport).
Jul 19, 2024 pm 01:09 PM
Solution to the problem of regularly restarting tomcat script and not executing it after adding crontab
I found a script on the Internet to restart tomcat regularly. It is possible to execute it automatically, but it will not execute after adding crontab. The restart script is as follows restart_tomcat.sh#!/bin/bashtomcat_home=/usr/local/tomcat8SHUTDOWN=$tomcat_home/bin/shutdown.shSTARTTOMCAT=$tomcat_home/bin/startup.sh$SHUTDOWN$STARTTOMCAT scheduled task 02***cd/opt&& ./restart_tomca
Jul 19, 2024 am 11:07 AM
Kali Linux SSH login troubleshooting
Today I wanted to use Kali to do something bad, but what I didn't expect was that after the installation was completed, SSH could not go up. I was really unhappy. Let's take a picture first to see what happened, so that children with the same problem can know how to solve it. this! ! ! In fact, I forgot to enable the SSH service, so I need to enable the SSH service in Kali. The command is as follows: #servicesshdstart. Then reconnect, otherwise the following problems will occur (this is the focus of today). The SSH connection has been successful. Next, I was asked to enter a password, but it seemed that the password was wrong no matter how I entered it. Until the end, it prompted "Permission denied, please try again." This means that I do not have permission.
Jul 19, 2024 am 05:47 AM
How to modify the maximum open file limit for Linux system users?
1. Changes in the file number limit 1. View the maximum open file limit for Linux system users at the user level: #ulimit-n1024(1)vi/etc/security/limits.confmysqlsoftnofile10240mysqlhardnofile10240 where mysql specifies the limit on the number of open files for that user to be changed. The '*' sign can be used to indicate changing the limit for all users; soft or hard specifies whether to change the soft limit or the hard limit; 10240 specifies the new limit value that you want to change, that is, the maximum number of open files (please note that the soft limit value must be greater than or equal to the hard limit). (2)vi/etc/pam.d/lo
Jul 19, 2024 am 04:59 AM
Introduction to how to modify the groups to which Linux users belong and related practical tools
How Linux changes the groups to which a user belongs - **groupadd** and **groupdel**: used to add and delete user groups respectively. -**chown** and **chgrp**: used to modify the owner and group of a file or directory. There are also some practical tools related to user management: -**pwcov**: synchronize `/etc/passwd` to `/etc... Use the mkdir command to create directories and subdirectories under Linux. For example, `mkdir- m=r--letter` will create a directory named `letter` with permissions set to the owner only having read permissions, and the user group and other users having no execute and write permissions. generally,
Jul 19, 2024 am 02:52 AM
Centos 7 binary installation and configuration MariaDB database
Since each company's database server version is different, I still recommend everyone to use the Mariadb database. At least for now, the community and products are very stable. As for any new features, it is recommended to go to its official website to learn more about the features. Check the system version command $cat/etc/redhat-releaseCentOSLinuxrelease7.4.1708(Core)x64 Install MariaDB (MySQL) Download the MariaDB binary installation package: https://downloads.mariadb.org Unzip and install the Mariadb-devel static library: $yuminstallmariadb- develn
Jul 19, 2024 am 02:20 AM
Detailed introduction and usage of code implementation of forwarding server and proxy server
The code was written after work. The code is divided into forwarding server and proxy server. Let’s talk about the forwarding server first. Although the forwarding server can also be said to be a redirection server, Linux uses a proxy server. For example, the forwarding server eavesdrops on port 80. If a browser user accesses the server IP (browser requests port 80 by default), after the forwarding server receives the browser user's request, it redirects the browser user's request to other ports on this machine or to designated ports on other machines on the same public network. Let's talk about the proxy. Let me explain the server first. My proxy server can only proxy designated websites or other customers who can proxy, such as SVN services built on the external network or intranets that are inaccessible in some places.
Jul 19, 2024 am 02:17 AM
How to run stable diffusion using school high-performance GPU without root access and network
As we all know, stablediffusion usually cannot be driven by laptop GPUs. It is said that at least 4GB of GPUVRAM is needed, but it is not enough if you want to use it at "normal speed (1)". Want to use the cloud? Some cloudgpu rental prices are acceptable, and they usually don't allow you to store files. Opening a cloud storage is another expense, and it's troublesome to transfer files to and from them. So I (mainly my tutor) decided to use the GPU from the middle school in order to save money. (1) Approximate reference regardless of GPU model speed: My GPU2GB: 3 minutes for one picture. Linux uses a proxy server for Linux system programming. Friends AGPU6GB: 50 seconds for one picture. Friends BGPU32GB: 2S for one picture.
Jul 19, 2024 am 12:30 AM
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