Linux

I. MySQL replication related concepts1, Master-slave replication: The primary node synchronizes data to multiple slave nodes2. Cascade replication: The master node synchronizes data to a slave node, and the other slave nodes replicate data to the

Environment centos6.4 Install SVN Yum-y Install Subversion Configuration Build the Repository DirectoryMkdir/lh/svndataSvnserve-d-r/lh/svndataTo see if it started successfully: NETSTAT-LNT | grep3690 Ps-le | grep SVN

case: Building a soft RAID disk arrayRequirements DescriptionAdd 4 SCSI drives to a Linux serverBuild RAID10 arrays with Mdadm software packages to improve disk storage performance through RAID0 high-read, RAID1, high reliability⑴ installation Mdadm[

Install the Nginx steps and the problems encountered:1, yum install GCC gcc-c++//execute the command after the problem, has been circulating the execution of three of these sentences, as shown:The solution is to Ctrl-Z, then enter

Linux file propertiesIn Linux, for each file has the corresponding attributes, in the root user home directory of Linux in the new file A.txt as an example, enter a few characters in the A.txt Use command Ls-ild a.txt to view file

1. Origin of SpinlockSpin Lock: An Access Protection lock on a shared resource, which uses a "spin" loop to wait for a mutex to be

Preparatory work:　　1. Download Xshell (Https://pan.baidu.com/s/1edKFDZ1NjQZdzJZooZqZ1Q)2.Linux Configure IP address.Installation:　　Xshell installation: Divided into enterprises, school personal Two, enterprises need to pay, I installed the school

Some important configuration files of the three-linux system of Linux Learning1. Network Card configuration file/etc/sysconfig/network-scripts/ifcfg-eth0DescriptionDevice=eth0 #网卡名称Hwaddr=xx:xx:xx:xx:xx:xx #网卡的mac地址, total 48 bits This is

1. Lsof-i: Port number2. Netstat-tunlp|grep Port numbercan see which process is consuming the specified portTools/Materials Linux,windows Xshell Method/Step "Step One" lsof-iThe lsof-i is used to display conditions that

Basic Linux Operations0.Linux shortcut keys and common operations 01. Shortcut keys 01.tab ： 命令行自动补全－自动补全当前的命令行。如果启用自动补全脚本命令参数和选项也可以自动补齐。02.ctrl-l ： 清屏或者clear03.ctrl-a ： 把光标移动到命令行最开始的地方。04.ctrl-e ： 把光标移动到命令行末尾。05.ctrl-u ：

As a qualified Java background developmentOften need to query the log on the line, to locate the problem on the lineSo master the command of log queryAllows you to locate the error log location more quickly and solve the problem in a timely

A blocking/nonblocking method is available when an application accesses a device file. If you are using blocking mode, call Open (), read (), write () directly, but the driver layer will determine whether it is readable/writable, and if

Add the following to the/etc/profile for all users effectively. Valid only for the current user in the home directoryAdd the following to the. bashrc or. Bash_profile:(Note: Do not add a space before the equal sign, or command not found may

The memory cache appears to be resolved, the difference between the read and write speed of the device!00. Linux Cache Interpretation/proc/sys/vm/drop_caches (since Linux 2.6.16)Writing to this file causes the kernel-to-drop clean caches,dentries

Linux Public key Private key implementation without password login First local host generates convention and private key # Ssh-keygen /Generate public and private keysDo not change the default path, do not enter the password in the middle,

First, the boot automatically mount file system settings Create a new Rhel directory under/media and mount the/DEV/SR1 second optical drive to that directory #mkdir/media/rhel#mount/dev/sr1/media/rhel Automatically mount file

A log is a historical event used to record the state of a system's operation, primarily recording events that occur at a particular time, and, depending on the log level, the critical program of the event, often called LogLevel.System Log

First, user management1. Add Users useradd [options] USERNAME：useradd用法 -u：添加用户时指定其UID，如useradd -u 520 student，添加student用户并指定其UID为520。 -g：添加用户时指定其GID（基本组），如useradd -g 521 student，添加student用户并指定其基本组的GID为521，需要注意的是521的GID必需存在。

Several ways to empty Linux files1. How to use redirection[[email protected] ~]# du -h test.txt 4.0K test.txt[[email protected] ~]# > test.txt [[email protected] ~]# du -h test.txt 0 test.txt2. Use the true command to redirect the empty

1. Sort Command functionThe sort command is used to sort the contents of the text file, sorting the input rows by key-value fields and data type options, and by locale.A predictable sequence of records makes it easier for users to see and use: The