exit exit

#!/bin/bashread -p 'Please input the directory of hadoop , ex: /usr/hadoop :' hadoop_dirif [ -d $hadoop_dir ] ; then echo 'Yes , this directory exist.'else echo 'Error , this directory not exist.' exit 1fiif [ -f

Adsl analog dialingSimulate ADSL and Modem dialing environment: Windows PacketTracert5.3 ....... objective: To learn about dial-up Internet access and master the basic configuration steps: Create the topology as follows: Configure ISP: Configure AAA:

/** guess the alphabet game needs are as follows: The program randomly produces 5 characters in a certain order as a result of guessing (5 characters are not allowed to repeat), and the player guesses the string. The player can guess multiple times (

Required header file: #include #include pid_t vfork (void);Function: The Vfork () function and the fork () function (fork () How to use it, click this link) all create a new process in an existing process, but the child

Required header File : #include #include pid_t vfork (void);features : The Vfork () function and the fork () function (fork () How to use it, click this link) all create a new process in an existing process, but the

For a spline curve object created with the "spline" command, the user can modify it using the "splinedit" command. The command is invoked in the following way: Toolbar: "Modify II (Modified II)" → Menu: "Modify (modified)" → "Object" → "Spline

Article Title: minicom is used in CentOS. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. Before giving you a

Example of the hadoop configuration file automatically configured by shell [plain] #! /Bin/bash read-p 'Please input the directory of hadoop, ex:/usr/hadoop: 'hadoop_dir if [-d $ hadoop_dir]; then echo 'yes, this directory exist. 'else echo 'error,

  1. View Introduction From the analysis in the previous articles, we can see that all commands are included in the node, which is visible in the CLI format of common routers or switches of Cisco or H3, A node corresponds to a view ). Common views

Linux programming-vfork () function details, vfork function details Required header file: # Include # Include Pid_t vfork (void ); Function: The vfork () function and the fork () function (fork (), please click this link) are the same as

MHA IntroductionMHA is a MySQL, a Japanese MySQL Daniel written in Perl failover scheme to ensure the high availability of the database system. During downtime (usually within 10-30 seconds), complete failover, deploy MHA, avoid master-slave

Implementing the Environmentcentos6.7MYSQL5.6.36Master: 192.168.1.191From 1:192.168.1.145From 2:192.168.1.146Monitoring: Placed on the 192.168.1.146 from 2Virtual ip:192.168.1.222Prepare package: Download Link: https://pan.baidu.com/s/1jHYafcU

King01 as Master king02 with king03 as King01 slave,king04 as Mha_manager[[email protected] ~]# mkdir. SSH[[Email protected] ~]# CD. SSH[email protected]. ssh]# ssh-keygen-t dsa-p "-F ID_DSA[email protected]. ssh]# Cat id_dsa.pub >> Authorized_keys[[

master_ip_failover.sh script is written in Perl, can be found in the Mha-manager source package, the following gives the combination of keepalived for automatic switching script:[email protected] scripts]# cat master_ip_failover.sh#!/usr/bin/env

[2] Recovery method when the database is modifiedThe database has been modified, there may be many reasons for the intrusion, and the corresponding program has a bug, and so on, not described in detail here. This will only show you how to revert to

First, IntroductionMHA:You can think of it as a tool for monitoring MySQL, when Master hangs up, a slave as master, and another slave as the new Master's repository;So the MHA architecture is three databases, and has been done in advance

After learning about the sqlcmd parameter, let's take a look at the sqlcmd command and use: HelpLet's take a look at the common commands. 1>: Help :!! [] -Run the command in Windows Shell. : Connect server [\ instance] [-l timeout value] [-u

An example of using a private heap:Unit unit1;InterfaceUsesWindows, messages, sysutils, variants, classes, graphics, controls, forms,Dialogs, stdctrls;TypeTform1 = Class (tform)Button1: tbutton;Procedure button1click (Sender: tobject );End;VaRForm1:

Erlang development experience: Anti-pitfall guide and erlang experienceThis problem occurs in any language, and so does erlang. Here we will sort out some of my problems to avoid further difficulties. To be honest, the title of "anti-pitfall Guide"

WINDOWS 2008R2 The domain server password is forgotten or modified by others, and the server does RAID 5 SolvePrepare in advance: A, download the server RAID card driver on the USB stick. B, find a copy of the same version of the operating disc1.