Redis主从复制和主从切换

参考：
+ Redis Sentinel机制与用法（一）
+ Redis主从复制和主从切换

摘要
Redis的主从复制功能可以实现读写分离，一个主可以挂载多个从．从服务器只能实现读不可写．当主服务器挂掉之后，无法切换到从服务器写．通过Redis的Sentinel可以实现主从切换：当主服务器挂掉之后，自动将其中一个从服务器升级为主服务器

一：配置主从复制

当前的机器分布

redis1:192.168.25.128
redis2:192.168.25.129

期望实现结果：在redis1中set的值可以在redis2中取出

配置：

在redis2的reids配置文件中加入
slaveof 192.168.25.128 6379
重启redis即可。

注意：redis.conf中的bind 127.0.0.1最好注释掉，否则可能在别的电脑上通过ip访问不到

测试结果：redis1中改变 redis2中也改变了

[root@bogon etc]# redis-cli -h 192.168.25.128
192.168.25.128:6379> get name
"xiaoguo"
192.168.25.128:6379> set name xiaowang
OK
192.168.25.128:6379> 

[root@bogon etc]# redis-cli -h 192.168.25.129
192.168.25.129:6379> get name
"xiaowang"
192.168.25.129:6379>

二：配置自动切换

我的redis的目录结构

redis/
        bin  dump.rdb  etc  redis.log  temp-1467161779.33597.rdb  temp-1467278541.2161.rdb
配置文件在etc中，执行脚本在bin中

在etc中添加sentinel.conf文件，文件内容如下（配置详细讲解见博客顶部参考的文章）

sentinel monitor mymaster 192.168.25.128 6379 1
sentinel down-after-milliseconds mymaster 60000
sentinel failover-timeout mymaster 180000
sentinel parallel-syncs mymaster 1

保存后，执行redis-sentinel sentinel.conf &（如果不加&则不是后台运行）
通过以上配置就可以自动切换了
以上配置我在192.168.25.129中也配置了一份，放哪股指sentinel的单点故障

三：项目中的测试

我的项目是maven springmvc配置如下

  <bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver">
        <property name="viewClass"
                  value="org.springframework.web.servlet.view.JstlView"/>
        <property name="prefix" value="/WEB-INF/views/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

    <bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
        <property name="maxTotal" value="30" />
        <property name="maxIdle" value="200" />
        <property name="maxWaitMillis" value="3000" />
        <property name="testOnBorrow" value="true"/>
    </bean>
    <!-- spring data redis -->
    <bean id="jedisConnectionFactory"
          class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
        <property name="poolConfig" >
            <ref bean="jedisPoolConfig"/>
        </property>
        <constructor-arg name="sentinelConfig" ref="redisSentinelConfiguration"/>
        <property name="timeout" value="100000"/>
    </bean>

    <bean id="redisSentinelConfiguration" class="org.springframework.data.redis.connection.RedisSentinelConfiguration">
        <property name="master">
            <bean class="org.springframework.data.redis.connection.RedisNode">
                <property name="name" value="mymaster"/>
            </bean>
        </property>
        <property name="sentinels">
            <set>
                <bean class="org.springframework.data.redis.connection.RedisNode">
                    <constructor-arg name="host" value="192.168.25.128"></constructor-arg>
                    <constructor-arg name="port" value="26379"></constructor-arg>
                </bean>
                <bean class="org.springframework.data.redis.connection.RedisNode">
                    <constructor-arg name="host" value="192.168.25.129"></constructor-arg>
                    <constructor-arg name="port" value="26379"></constructor-arg>
                </bean>
            </set>
        </property>
    </bean>

    <!-- Redis Template -->
    <bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate">
        <property name="connectionFactory" ref="jedisConnectionFactory" />

    </bean>

pom文件（请自行增删）：

    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
        <modelVersion>4.0.0</modelVersion>
        <groupId>com.favccxx.favsoft</groupId>
        <artifactId>favspringmvcrestful</artifactId>
        <packaging>war</packaging>
        <version>0.0.1-SNAPSHOT</version>
        <name>favspringmvcrestful Maven Webapp</name>
        <url>http://maven.apache.org</url>

        <properties>
            <spring.version>4.1.1.RELEASE</spring.version>
        </properties>

        <dependencies>
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>3.8.1</version>
                <scope>test</scope>
            </dependency>

            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-core</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-webmvc</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-beans</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework.data</groupId>
                <artifactId>spring-data-redis</artifactId>
                <version>1.6.0.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-tx</artifactId>
                <version>${spring.version}</version>
            </dependency>

            <dependency>
                <groupId>jstl</groupId>
                <artifactId>jstl</artifactId>
                <version>1.2</version>
            </dependency>
            <dependency>
                <groupId>taglibs</groupId>
                <artifactId>standard</artifactId>
                <version>1.1.2</version>
            </dependency>
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>servlet-api</artifactId>
                <version>2.5</version>
            </dependency>
            <dependency>
                <groupId>cglib</groupId>
                <artifactId>cglib-nodep</artifactId>
                <version>3.1</version>
            </dependency>
            <dependency>
                <groupId>org.apache.commons</groupId>
                <artifactId>commons-lang3</artifactId>
                <version>3.1</version>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>1.2.5</version>
            </dependency>
            <dependency>
                <groupId>org.aspectj</groupId>
                <artifactId>aspectjweaver</artifactId>
                <version>1.8.2</version>
            </dependency>
            <dependency>
                <groupId>net.sf.ehcache</groupId>
                <artifactId>ehcache</artifactId>
                <version>2.7.5</version>
            </dependency>
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-api</artifactId>
                <version>1.6.6</version>
            </dependency>
            <dependency>
                <groupId>redis.clients</groupId>
                <artifactId>jedis</artifactId>
                <version>2.5.2</version>
            </dependency>
            <dependency>
                <groupId>commons-pool</groupId>
                <artifactId>commons-pool</artifactId>
                <version>1.6</version>
            </dependency>
            <dependency>
                <groupId>commons-logging</groupId>
                <artifactId>commons-logging</artifactId>
                <version>1.1.1</version>
            </dependency>
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-log4j12</artifactId>
                <version>1.7.10</version>
                <scope>test</scope>
            </dependency>

        </dependencies>
        <build>
            <finalName>favspringmvcrestful</finalName>
        </build>
    </project>

HelloWordController：

    package com.xiaoli.nginx.controller;

    import org.springframework.data.redis.core.RedisTemplate;
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.RequestMapping;

    import javax.annotation.Resource;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;

    /**
     * Created by xiaoli on 2016/6/30.
     */
    @Controller
    public class HelloWordController {
        @Resource
        private RedisTemplate<String, Object> redisTemplate;

        @RequestMapping("/")
        public String sayHello(HttpServletRequest request, HttpServletResponse response, Model model) {
    //        redisTemplate.opsForValue().set("name","xiaoguo");
            String value = (String) redisTemplate.opsForValue().get("name");
            model.addAttribute("name", value);
            return "hello";
        }
    }

hello.jsp：

    <%--
      Created by IntelliJ IDEA.
      User: xiaoli
      Date: 2016/6/30
      Time: 16:08
      To change this template use File | Settings | File Templates.
    --%>
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>Title</title>
    </head>
    <body>
    hello,i'm ${name}
    </body>
    </html>

启动项目：杀掉redis1 刷新界面已让可以访问，redis2顶上去了，如果你去看redis2，你会发现方才你添加的 slaveof 192.168.25.128 6379不见了，没错，他变成了主了，哥们！

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Redis主从复制和主从切换

Redis主从复制和主从切换

一：配置主从复制

二：配置自动切换

三：项目中的测试

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