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OutlineI. What is AIS and OpenaisSecond, what is CorosyncThree, Corosync installation and configurationI. What is AIS and OpenaisApplication Interface Specification AIS is a collection of open specifications used to define application interface APIs

If a system administrator spends a lot of time solving problems and doing repetitive work, you should wonder if he is doing the right thing. An efficient system administrator should make a plan to spend as little time as possible on repetitive tasks.

The LS command is used to display which files and folders are in the directoryLsBlue indicates folder White is fileLs-r List the contents of all folders (R = recursive)Ls-l View details including file permissions last modified time size (L for

1. What is a shell?The shell is the interface between the user and the Linux operating system.There are multiple shells in Linux, with bash being used by default.Classification of 2.shell(1) BashThe bash Shell is a free version of the Bourne shell,

When we installed a new CentOS system in the virtual machine, although in the installation of the NTP set up the selection of Shanghai, but entered the system, enter the date command, check the system time and the current time is not the same, we

The general idea is:First export the SVN directory under Windows to a folder (so there is no extra. SVN directory), then package the directory as a *.rar file via WinRAR, and then sync the packaged file to the Linux server via the rsync command.

The PHP switch loop, usually dealing with the conditional judgment of the compound, each child condition, is the case instruction part, usually the variable name. The ExprN after the case usually represents the value of the variable. The colon is

The Output Control function is detailed: flush-Refresh the output buffer ob_clean-Empty the output buffer ob_end_clean-Clears the buffer and turns off the output buffer ob_end_flush-Flushes out the output buffer contents and closes the

I. Characteristics of String types1, PHP is a weakly typed language, other data types can be directly applied to string function operation.1:Output 345Output 345Look for Hello constants first, and if not found, use Hello as a string2, the string can

These features are explained below. 1, intercept the string Intercepting a string can be said to be one of the most common functions of string processing, one or more characters that can be used to intercept a particular position in a string.

#!/bin/bash # program: # System_init_shell # History: # 2012/04/1 25061008@qq.com # Release: # 1.1 Cat +--------------------------------------------------------------+ | = = Welcome to Centos 5.x System init = = | +------------------------

HTTP keepalivein the early days of HTTP, each HTTP request required a TPC socket connection to be opened, and the TCP connection was disconnected once it was used. Using keep-alive can improve this state of being able to send multiple copies of data

Cleaning up the boot-up service Shows the startup status of all running levels for all services#chkconfig –listStop all services starting at run Level 3#for Oldboy in ' chkconfig–list |grep 3:on |awk ' {print $} ';d o chkconfig–level 3 $oldboy

Arithmetic operators Operator name Result $a + $b addition $a and $b and $a-$b subtraction $a and $b difference $a * $b multiplication of $a and $b $a/$b division $a divided by $b quotient $a% $b modulo $a divided by the remainder of the

In the age of smartphones, each brand's mobile phone has its own personality characteristics. It is the unique personality to attract users, create brand cohesion and loyalty to the city, the typical representative of the non-iphone. According to

First, SPRINGMVC basic introduction, create a HelloWorld program 1. First, import the jar package that SPRINGMVC needs. 2. Add web.xml configuration file about SPRINGMVC configuration springmvc

KeepAlive and Heartbeat packs in TCP connection probes. Keywords: tcp keepalive, Heartbeat, keep alive KeepAlive and Heartbeat packs in TCP connection probes. Keywords: tcp keepalive, Heartbeat, keep aliveCategory: Linux2013-11-29 17:46 3855

Reprint please indicate the source: https://blog.csdn.net/l1028386804/article/details/80188532One: The network changed to static Vim/etc/sysconfig/network-scripts/ifcfg-eth0 device=eth0 hwaddr=00:0c:29:e4:2d:ad TYPE=Ethernet Uuid=6a5e3936-04f3-479e-

$a = ';Echo ' 1---------------'. Empty ($a). ' ';$a = ' 0 ';Echo ' 2---------------'. Empty ($a). ' ';$a = 0;Echo ' 3---------------'. Empty ($a). ' ';$a = null;Echo ' 4---------------'. Empty ($a). ' ';$a = ' null ';Echo ' 5---------------'.

database additions and deletions to check curd operation Add Data return bool //$bool = Db::insert (' INSERT into student (Name,age) VALUES (?,?) ', [' Imooc ',]); Var_dump ($bool); Update data //$num = db::update (' update student set age =?