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Experience in configuring and installing centos on server DELL R710

When I wrote this article, I had just installed the system on a DELLR710. Installing the system on the server for the first time. The article will not describe the installation process in detail, there are many online. I will only describe the problems I encountered. In fact, the server is just larger, and the hardware self-test time is longer. Others are no different from ordinary PCs. There is no way to boot the U disk startup item or the optical drive startup item. I checked a lot of information at that time. I forgot to modify the boot options. Some old systems default to BIOS boot and must be modified to UEFI boot. Change the settings in the BIOS. I checked a lot of information at that time and suspected that it might be related to RAID. In fact, it doesn't matter. My server only had one disk, and all the configurations didn’t work well at that time.

Jan 07, 2024 pm 06:46 PM

Linux Linux系统红帽 Linux命令 linux认证红帽linux linux教程 linux视频

How to set the line number of vim in Ubuntu? How to set the line number of vim in Ubuntu

Today I use vim to write code under Ubuntu. As usual, I set the line number of vim first. I didn’t think about anything every time, but today I thought about it. Can vim be initialized when it is opened? I checked the relevant information online and practiced it myself. If it works, I will post it and share it with everyone! (The set vim line number is valid for all users (including root users)) 1. Open the terminal, enter cd /etc/vim in the command line and hit Enter to enter the /etc/vim directory; 2. Enter etc/vim directory, find the vimrc file (vim’s initialization file), and use the cp command to back it up. The command is: cpvimrcvimrc.bak

Jan 07, 2024 am 11:41 AM

Ubuntu vim 行号

How to set the number of user handles and user processes in CentOS?

CentOS sets the number of user handles and user processes 1. Add the number of user handles in vi/etc/security/limits.conf at the end of the file #Myadd*softcoreunlimit*hardcoreunlimit*softfsizeunlimited*hardfsizeunlimited*softdataunlimited*harddataunlimited*softnproc65535*hardnproc63535*softstackunlimited*hardstackunlimited* softnofil

Jan 06, 2024 pm 11:45 PM

CentOS 用户句柄数进程数

How to change Ubuntu's apt-get update source?

Manually modify Ubuntu's apt-get source 1. Use the ssh tool to connect to Ubuntu (I use xshell) 2. Type cd/etc/apt/3 on the command line and back up the source.list file in this directory (you must have sudo permissions) ), then there is a source.list.bak file. 4. Clear the source.list file content (note: it cannot be restored after clearing, so you need to perform the previous step to back up the file in advance). At this time, use sudo to prompt that the permissions are insufficient. Switch directly to the root user and execute this command. 5. Use vim to open source.list, press the i key to enter the editing mode, paste the source address to be modified, and then press

Jan 05, 2024 pm 03:40 PM

Ubuntu get apt 源

Explore VIM advanced operation skills

Introduction This article collects some simple VIM operations that either cannot be completed by other ordinary text editors or are completed very slowly. Through the introduction of this article, beginners can strengthen their determination and confidence in learning VIM. If you have any good simple techniques that are easy to demonstrate, please leave a message. In addition, unless otherwise stated, the keys mentioned in this article are case-sensitive. For example, when the article says "press G," the key you press should be "Shift+G." 1. Preparation First, we open VIM and enter a piece of text for today's demonstration: thisisatest2. Find and replace. Press ESC several times to enter Normal mode and enter the following command: :%s//\r/g/. The effect you get after pressing Enter

Jan 05, 2024 am 10:52 AM

Linux Linux系统红帽 Linux命令 linux认证红帽linux linux教程 linux视频

I cannot access the Internet after CentOS is installed. How to solve the problem?

The main reason why CentOS cannot access the Internet normally after installation is because the gateway is in the No state under the directory /etc/sysconfig/network-scripts/. This requires changing it to yes: 1. First enter /etc/sysconfig/network- Under scripts/, find the file ifcfg-eno (the number after the file is random, and different computers have different numbers after installation), use the vim/vi editor to open the file; 2. After configuring, wq saves and exits, then the network configuration It still doesn’t take effect, you need to restart the network service servicenetworkrestartOk! Done

Jan 04, 2024 pm 06:06 PM

CentOS 安装后不能连网

How to solve the problem that OpenCV cannot read video files on CentOS

Under CentOS, I followed the tutorial steps to install OpenCV, but in the end I could not read the video file because ffmpeg was missing. So I installed ffmqeg through the software management in CentOS, but it still had no effect. Then I compiled ffmpeg, but it still had no effect. In fact, a key step is missed, which is to associate ffmpeg with OpenCV. The details are as follows: 1. Obtain ffmpeg: Download ffmpeg through cvs, and enter the command line: svncheckoutsvn://svn.ffmpeg.org/ffmpeg/trunkffmpeg 2. Configure ffmpeg: Enter the ffmpeg directory and execute ./c

Jan 04, 2024 am 11:43 AM

OpenCV 无法读取视频

How to solve the diamond garbled problem in Linux? How to fix Linux diamond garbled characters?

Solution to the Linux diamond garbled code: Execute the command: vim/var/lib/locales/supported.d/local to delete the original class content inside and add it as: en_US.UTF-8UTF-8 Execute the command: vim/etc/default Modify /locale to: LANG="en_US.UTF-8"LANGUAGE="en_US:en" Remember to save after modification. Please use root permissions to enter the modification. Then restart directly and it will be OK.

Jan 03, 2024 pm 11:38 PM

Linux 菱形乱码

How does Debian's missing verification public key solve the security update problem?

Author:SamsonDate:11/02/2014Testplatform:3.13.0-24-genericGNUbash,4.3.11(1)-release Add Debian security updates to the system's update source configuration file: v0id@v0id/etc/apt/sources. list.d$sudovimofficial-package-repositories.listdebhttp://security.debian.org/wheezy/updatesmaincontribnon-free use ap

Jan 03, 2024 pm 10:42 PM

debian 安全更新验证公钥

How to set permissions for files in Linux? Linux file permission setting tips

If we want to run such a file, we need to add an executable permission to the file separately. How to add an executable file to the file? There are three types of access permissions for files or directories: read-only, write-only and executable. Let's take a look at the detailed operation process. Log in to the Linux system, create a new terminal, use the touch command in the terminal to create a file, use the Vim editor, write some content in the file, enter: wq to save and exit, return to the terminal, use ls-l to view file permissions, use the chmod command and + The x parameter gives the file executable permissions, where

Jan 03, 2024 pm 07:46 PM

Linux 给文件权限可执行权限

Steps and methods to add swap partition - Linux System Guide

If you want to add a swap partition in a Linux system, how do you add it? Let’s take a look at the detailed tutorial below. 1. First, click "Launcher" on the dock bar, find "Deepin Terminal" and run it. 2. Then set a password for the root user. Because the installation process is for the administrator user, the root password is not set. sudopasswdroot3. After the setting is completed, execute the su command to switch to the root user. 4. Execute the following command to generate a swap file in the root directory, count sets the number of blocks, and bs sets the block size to generate a 4G swap. ddif=/dev/zeroof=/swapfilecou

Jan 03, 2024 pm 07:10 PM

Linux swap

How to find and access shadow files using Linux?

Linux systems are generally used to build servers, so how to find shadow files in the Linux system and enter and view shadow files? Let’s take a look at the detailed tutorial below. 1. First log in to the Linux system or server using the root account. Note: Because the permissions of the shadow file are 000, the actual encrypted password saved cannot be viewed by other users except the root user. This effectively ensures the security of the password. If the permissions of this file have changed, you need to pay attention to whether it is a malicious attack. 2. Enter the command w and press enter to check whether the current user is the root user. If not, switch the user to root. 3. Enter the command cd/etc and press enter e

Jan 03, 2024 pm 06:11 PM

Linux 影子文件

Delete redundant linux system boot items

Since I upgraded the system, the new and old versions (Grub and Grub2) of the boot system appear in the grub boot mode, with two boot items each for normal startup and recovery mode, as shown in the following figure: Baidu cannot find the relevant or I had to get up in the middle of the night to study a similar tutorial, but now I have finished it and written down notes. At this time, we select the new version of the boot item (the old version of the boot cannot log in to the system). After entering the system, open the terminal interface, use the cd command to switch to the /boot partition, and then use the ls command to view the partition. At this time, there should be The two folders grub and grub2 are displayed. The focus is on the grub2 folder. Use the cd command to switch to the /boot/grub2/ directory, and then use ls

Jan 03, 2024 pm 03:17 PM

Linux Linux系统红帽 Linux命令 linux认证红帽linux linux教程 linux视频

Vim shortcut key list

The Vim editor is a command line-based tool that is an enhanced version of the legendary editor vi. Although there are many rich text editors with graphical interfaces, familiarity with Vim can be helpful to every Linux user - whether you are an experienced system administrator or a novice user who has just started using Raspberry Pi. This lightweight editor is a very powerful tool. In the hands of an experienced user, it can do incredible things. In addition to regular text editing functions, it also supports some advanced features. For example, regular expression-based search and replacement, encoding conversion, and programming features such as syntax highlighting, code folding, etc. There is a very important point to note when using Vim, that is, the function of the keys depends on the current editor

Jan 03, 2024 pm 01:30 PM

Linux Linux系统红帽 Linux命令 linux认证红帽linux linux教程 linux视频