Linux

LVM logical Volumes1. Manage the scattered space.2. Expansion and reduction of logical volume dynamics.First, a number of physical volumes (PV) are formed into a volume group (VG),The logical volume (LV) is then divided from the volume group.Command:

FullWhen you start to see the following interface, press E to enter the editing interfaceAnd then you see this.Click on e again to select the second itemSelect the second item and press E to enter the edit interface, enter single (remember that

The BC command is a calculator language that supports interactive execution of arbitrary precision.Bash has built-in support for integer arithmetic, but it does not support floating-point operations, and the BC command can be very handy for floating-

[ Email protected] Desktop]# pwd #查看当前目录/root//etc/sysconfig/network-Scripts #切到这个目录下 [[Email Protected] Network-2321 root root 287:21 ifcfg-eno16777736 #这个就是你的网卡名 1 root root 254 September Ifcfg-lolook at the name of the NIC.Linux operating

First, shutdown, restart1. Turn off the machineShutdown option [option] ... Parameter (time) option:-R: Restart-H: Shutdown-C: Cancel the previously set restart or shutdown command-K: Send only reminder time format: default equivalent to +1hh:mm now:

Linux Package Installation methodOne, three ways to install the package Rpm Yum Tool Pack SOURCE Package RPM Package Introduction Second, RPM introductionRPM is an abbreviation for RPM Package Manager(rpm packages Manager),

RPM Toolsrpm is by Red Hat and other jobs. However, the dependencies between RPM packages are often cumbersome, especially when the software is made up of multiple RPM packages. Company developed software package management method, using RPM we can

1. System Maximum Open file descriptor:/proc/sys/fs/file-max A. View$ cat/proc/sys/fs/file-max1864052. SetA. Temporary# echo 1000000 >/proc/sys/fs/file-max2. persistent: Set in /etc/sysctl.conf Fs.file-max = 10000002. Process Max Open

System of the computer:Hardware (Hardware) software (software)Hardware system: Host: CPU (OP alu and controller CU), internal memory (ROM RAM) external device: keyboard, mouse, monitor, hard disk, floppy disk, CD, tape ...Application software:

When applying unix/linux, we usually want to let a program run in the background, so we will often use & at the end of the program to let the program run automatically. For example we want to run MySQL in the

Previous blog We described ACL permissions for Rights management, and by setting ACL permissions, we specified a specific permission for a file for a user. In this blog we will introduce more than two commands chattr and sudo used in rights

1. Environment:1.1. os:red Hat Enterprise Linux Server release 7.4 (Maipo)1.2. kernel:3.10.0-693.el7.x86_642. Installation:2.1. Operating System Installation:2.2. Open the VT-X/AMD-V function:I created the virtual machine on ESXi, open location See,

Sudo Use   Ma Peng archive: Learning notes 2017/11/09 DirectoryHow to add sudo to a user Permissions ... 21th Chapter Sudu Introduction: ... 22nd Chapters How to

grep regular Expression meta-character set:^ The start of the anchor line, such as: ' ^grep ' matches all lines that begin with grep.The end of the anchor line is as follows: ' grep$ ' matches all rows ending with grep.. Match a non-newline

Update the Flash plug-in on Ubuntu and Ubuntu Flash I installed the Flash plug-in for Chrome before. Today, I am prompted to update it when I read the webpage. I think about the typical steps of searching the official website, selecting versions,

Add the scheduled Task Command crontab-e in CentOSRestart teamviewer every two hours to prevent external connection to the console and execute: crontab-e // enter the timer editing page. Add the following command: control + c! Wq save 0 */2 ***

Logical volume Management in linux-lvmI. Theoretical Principles LVM (Logic Volume Manager) logical Volume management is a mechanism for managing disk partitions in linux. LVM is a logical layer built on disks and partitions to improve the

CentOS network configuration and remote XShell connection At the beginning, PS prompts you: CTRL + ALT + F1 switch to desktop mode, CTRL + ALT + F3 switch to command line mode. PPS 1. Use the nmtui command to enter the network configuration mode

Linux environment variables Environment variables: Switch folders and find execution files. Check the environment variables env and set commands. The differences between the variables searched by set include User-Defined variables and bash

Mount a USB flash drive in fat32 format and a mobile hard drive in ntfs format on centos7 We know that by default, the file format of the USB flash drive is FAT32, while the NTFS format of the mobile hard disk is different. Therefore, the mounting