Linux

There are many factors that affect the performance of Linux servers, from the underlying hardware to the operating system, from the network to the upper level. Finding the balance between system hardware and software resources is key.1.uptime10:27:14

L, Linux Graphics environment can be uninstalled, Linux is not a graphical environment based on the operating system, 40 years ago, UNIX users can do all the work under the command line, and now still can. In the kernel's eyes, the graphical

GrepFilters, Egrep can be understood as grep's upgraded version1 format: grep [-cinvabc] ' word ' filename-C: Count the number of rows that meet the requirementsFor example:grep -c ‘root‘ /etc/passwdgrep -c ‘‘ /etc/passwdTotal rows of statistics

A face question, use three different methods to see 8080 is occupied by which process. Usually the familiar method is the netstat and the lsof two kinds, but still has what method.1.netstat or SS command802.lsof commandThis command is to see which

Linux Research on the extension of users in the systemProcess users and filesUsers and user groups in LinuxThere are only two levels in Linux: root and non-root, A user belongs to at least one user group A user can belong to more than

Original address: "Setting and viewing environment variables under Linux"types of variables for LinuxAccording to the lifetime of the variables, the Linux variables can be divided into two categories:1. Permanent: Need to modify the configuration

7.1 Three ways to install packagesThree different methodsRPM tool, installation will be prompted to rely on other packages, to a package to install a package;Yum tool, automatic download installation dependent package, the most easy to

The Linux dump command is used to back up the file system.Dump is a backup utility that backs up a directory or entire file system to a specified device, or back up to a large file.GrammarDump [-cnu][-0123456789][-b ][-b ][-d ][-f ][-h ][-s ][-t

Lsattr: View special permissions such as A, I (mentioned below)The e shown in the figure indicates a particular type of Linux, such as Ext3.Chattr: Change some propertiesChattr + A + file name: A here means that only information can be appended, not

Does the LINUX UDP socket01udp number binding error?Will, prompt address is using, local no differenceUDP does not need to initiate links, do not know whether the connection is successfulClient's IP address and port number is not correct, the packet

Split Daemon ProcessUsing the fork () return value to identify the nature of the current process because the first line is still in the loop after the fork () int i = 0; for (i = 0; i Pid==0 indicates that the process is no longer looping for

Kali Nic configuration file and kali configuration file The NIC configuration file of kali is/etc/network/interfaces, which defines the lo, eth0, and eth1 configurations. Auto lo # auto indicates starting the NIC device iface lo inet loopback auto

Use sed to delete pinyin tones and sed pinyin tones Sometimes we have the following requirements for document Filtering: For example, you can create a full pinyin dictionary with the last name. First, go to the Internet to find a common surname

Nginx service Optimization Configuration and nginx Optimization Configuration1. expires cache Module Specific configuration can refer to the official documentation http://nginx.org/en/docs/http/ngx_http_headers_module.html#expires [root@cairui conf]

What is TCP? Simplest three-way handshake description What is TCP? TCP (Transmission Control Protocol) is a connection-oriented, reliable, and IP-based transport layer Protocol. The Protocol Number of the TCP/IP packet is 6. TCP is a super

Four Methods for querying whether a port is occupied in Linux One interview question uses three different methods to check which process occupies 8080. The familiar methods are netstat and lsof, but what else can be done. 1. netstat or ss

Hadoop dynamically add and delete nodes datanode and restore 1. Configure the system environment Host Name, ssh mutual trust, environment variables, etc. This article omitted jdk installation, please ensure that the jdk installation path of datanode

Migrate Linux Mint 18.2 apt command to Ubuntu Server 16.04 LTS1. Problem Description There are two hosts, of which The Linux Mint 18.2 Sonya system is installed on 192.168.1.4. The host name is bkjiacom and the user name is bkjia. Ubuntu Server 16.04

How to compile and install the LAMP environment in CentOS 7.4 CentOS 7.4 LAMP: Linux, Apache, MySQL, and PHP. Directory:Part 1 preparationsPart 2 install the Apache servicePart 3 install the MySQL ServicePart 4 build the PHP Runtime EnvironmentPart 5

Deploy a multi-node Citus cluster on CentOS 1. perform the following steps on all nodes: Step 01 add Citus Repostory # Add Citus repository for package managerCurl https://install.citusdata.com/community/rpm.sh | sudo bash Step 02 install Citus and