Linux

1. What is the grep commandgrep full Name Global search regular expression and print out of the line, fully search regular expressions and print out the linesis a powerful text search tool.2. Common usage1) Search for files, print lines containing

DHCP service (one Linux for Windows):The experimental premise is to configure the Linux IP address to install the Yum sourceTwo machine Linux servers with Windows client:1. Experimental steps:DHCP server (Linux): IP 192.168.10.1/24 VMnet2Client

Important Start-up service1.sshd connecting a Linux server is a service program that needs to be usedA mechanism for 2.rsyslog operation logsSystem log:/var/log/messageHardware log: DMESG3.network system startup, if you want to activate/deactivate

Reference Document http://www.cnblogs.com/ivictor/p/6099807.htmlMaking RAID5 http://blog.51cto.com/11134648/2103384RAID0also known as stripe or striping, it represents the highest storage performance in all RAID levels. RAID 0 improves storage

Backup Centos-base.repomv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backupDownload new Centos-base.repo to/etc/yum.repos.d/wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repoDescription:

SELinux (security-enhanced Linux) is the United States National Security Agency (NSA) implementation of mandatory access control, is the most outstanding new security subsystem in the history of Linux.Turn off SELinuxTemporary entry into force:Order

1. Turn off SELinux (security-enhanced Linux): Mandatory access control2. Set RunLevel Run level3.Linux system boot process before booting to login4. Important Start-up service5. Common ways to set up server self-starting services6.

In order to drag and drop files between the Linux system and the host, and to automatically change the resolution, you need to install Vmtools to select the installation under the Virtual Machine menu bar VmtoolsSelect the. gz file in the drive,

Here is an example of a two-way circular link list. A generally defined list structure, such as a linked list of integers, uses the following structure:struct List_int { int n; struct list_int* next; struct list_int* prev;};Then there is an

IfconfigConfiguring and displaying network parameters for Linux system NICsAdditional InformationThe ifconfig command is used to configure and display network parameters for network interfaces in the Linux kernel. The NIC information configured with

Download Nginx , http://nginx.org/en/download.html wget http://nginx.org/download/nginx-1.15.1.tar.gz Install dependent packages Yum install-y pcre Pcre-devel Yum install-y zlib zlib-devel Yum Yum Install-y OpenSSL

The system is centOS6.5 SOURCE Package Download , https://nodejs.org/en/download/ Download version, NODE-V8.11.3-LINUX-X86.TAR.XZ, to be able to run after extracting the version with. XZ End Unzip the source package

Concurrent access: When multiple kernel paths access and manipulate data simultaneously, it is possible to overwrite shared data with each other, resulting in inconsistencies in the data being accessed.Critical section: Access and manipulate code

This blog installed Elk version of the current version of the latest 6.3.0, because Elasticsearch is based on Java development, so the JDK version is required, in the 5.0 version, requires JDK version of not less than 1.8 can be normal and practical.

Crontab: The daemon of timed tasks, accurate to minute, design the second we generally write the script--equivalent to the alarm clockLog file: ll/var/log/cron*Edit file: Vim/etc/crontabProcess: Ps-ef | grep crond ==>/etc/init.d/crond RestartRole:

The Ntpdate command is used to synchronize updates to Internet time, or NTP server timeThe NTP server "Network time Protocol (ntp)" is a protocol used to synchronize the computer's timing, which allows the computer to synchronize its server or clock

Yum Installation methodThe following installation is installed in the Centos Linux environment and if your Linux system is Ubuntu please use the Apt-get command.The Linux environment already supports Python by default. You can enter the Python

1.rpm"Command Function"The command of installing, querying, uninstalling, upgrading, and so on, is a powerful command, but it cannot solve the dependency problem, it is used to query and unload more first."Command Syntax"RPM [Options]

setting up SSH login without password can improve the security of our host. SSH login with no password to use the public and private keys. Linux can generate a public/private key pair with Ssh-keygen, followed by CentOS for example. Example diagram:

First, pre-installation preparation1. What is a virtual machineVirtual machine is a complete computer system that runs in a fully-functional environment through software simulations with complete hardware systems. The same as the actual server