Linux

The target of Linux process scheduling1. Efficiency: High efficiency means that more tasks are done at the same time. The scheduler will be executed frequently, so the scheduler should be as efficient as possible;2. Enhance the interactive

The system suddenly broke off the net, in the Messge log to see:June 14:23:52 localhost Kernel:WARNING:at net/sched/sch_generic.c:265 dev_watchdog+0x26b/0x280 (not tainted)June 14:23:52 localhost Kernel:hardware name:x9scl/x9scmJune 14:23:52

Click Back to learn the path of the Linux command line and shell script3.4-File Processing command touch CP MV RM1. touch命令 一是用于把已存在文件的时间标签更新为系统当前的时间（默认方式），它们的数据将原封不动地保留下来； 二是用来创建新的空文件。 Touch (options) (parameters)Options -

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Linux Viewing System Resource UsageDuring system maintenance, it may be necessary to review CPU and memory usage at any time, and to analyze the system's health needs based on the corresponding information. This article describes several common

First, prefaceThe crontab command is used under Linux as a scheduled task for managing and submitting a user's recurring execution, similar to the at scheduled task under Windows. This feature is installed on Linux systems, the service is installed

1. FAQ of common system files1) by modifying the file (), you can set the file system to mount automatically when booting.2) in the Linux system, when the LAN (LAN) does not have the condition of the case DNS server, but also want to let users

1. Check if the server port is occupied>lsof-i:80812. View all ports on the server>netstat-ntlp3. Check if the server is open for a portTCP port: >NETSTAT-NTPLUDP port: >NETSTAT-NUPLCommon parameters:-A (All) displays all options and does not show

Symptom: Df-h shows that the hard disk has 14G space, but touch File/mkdir directory fails, indicating that the hard disk has no space　　Cause: Df-ia View the use of the inode, found to have exploded, (show use 88%, not run out)　　So, what exactly is

Monitoring IO PerformanceIostat View disk condition (requires installation of Sysstat package)You can run the command directlyiostatOr add a 1 to the back, which is the dynamic display.iostat 1Iostat and Iostat 1 show things, with the SAR can be

LTP (Linux Test Project)Linux Test Project is a project developed and maintained by SGI, OSDL, and Bull, developed and maintained jointly by IBM, Cisco, Fujitsu, SUSE, Red Hat, Oracle, and other companies. The goal of the project is to provide test

Program Installation and Management Linux Application BasicsThe relationship between Linux commands and applications1): File locationSystem commands: Typically in/bin and/sbin directories, or as shell internal directivesApplications:

Linux Yum Command detailedYum (full name Yellow dog Updater, Modified) is a shell front-end package manager in Fedora and Redhat and SuSE. Based on RPM package management, the ability to automatically download the RPM package from the specified

Job is divided into foreground job and background jobThe foreground job (foreground) is started through the terminal, and the boot will always occupy the terminal. such as VIM, CPBackground jobs (background) can be started through the terminal,How

First, load Balancing introduction Main open source software LVs, keepalived, Haproxy, Nginx and so on; The LVS belongs to 4 layer (network OSI 7 layer model), Nginx belongs to 7 layer, Haproxy can be considered as 4 layer, can

The hands are too fast and the intestines are ruined. Would have been to delete a file rm path/myfile.txtThe result somehow added a *, becameRM Path/myfile.txt *Hurriedly LS, found that all the code is Utopia, has not been submitted, has not been

35.1 TTY: Displays the file name of the end device currently connected to the current standard input 35.2 Consoletype: Displays the type of console connected to the standard input 35.3 Fgconsole: Shows the number of active virtual terminals

-T # Specify the field separator character to use when sorting -n # Sort by numeric size -R # sort in reverse order -F # when sorting, treat lowercase letters as uppercase letters -D # When sorting, handle letters,

Install MariaDB and mariadb in CentOS7Install MariaDB1. yum -y install mariadb mariadb-server2. After MariaDB is installed, start MariaDB first. systemctl start mariadb3. Set startup systemctl enable mariadb4. Perform simple configuration of MariaDB

CentOS 7 host name modification and viewing command details In CentOS 6, the host name modification method is simple. You can use the hostname command to temporarily modify the Host Name and permanently change the host name to the file/etc/sysconfig/