Spring+redis sentinel 主从切换

待我称王封你为后i 2022-06-10 22:45 221阅读 0赞

# Spring+redis sentinel 主从切换 #

使用redis的sentinel可以避免redis单点故障，下面说一下spring使用redis sentinel模式的配置。

sentinel模式的spring文件配置：

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
        <context:property-placeholder location="classpath:redis.properties"/>
        <bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig">
            <property name="maxIdle" value="${redis.maxIdle}"/>
            <property name="maxTotal" value="${redis.maxActive}"/>
            <property name="maxWaitMillis" value="${redis.maxWait}"/>
            <property name="testOnBorrow" value="${redis.testOnBorrow}"/>
        </bean>
    
        <bean id="jedisConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
            <property name="usePool" value="true"></property>
            <property name="password" value="${redis.sentinel.password}"/>
            <property name="timeout" value="10000"/>
            <property name="database" value="0"></property>
            <constructor-arg index="0" ref="sentinelConfiguration"/>
            <constructor-arg index="1" ref="poolConfig"/>
        </bean>
    
        <bean id="sentinelConfiguration" class="org.springframework.data.redis.connection.RedisSentinelConfiguration">
            <property name="master">
                <bean class="org.springframework.data.redis.connection.RedisNode">
                    <property name="name" value="${redis.sentinel.master}"></property>
                </bean>
            </property>
            <property name="sentinels">
                <set>
                    <bean class="org.springframework.data.redis.connection.RedisNode">
                        <constructor-arg name="host" value="${redis.sentinel1.host}"></constructor-arg>
                        <constructor-arg name="port" value="${redis.sentinel1.port}"></constructor-arg>
                    </bean>
                </set>
            </property>
        </bean>
    
        <bean id="redisTemplate" class="org.springframework.data.redis.core.StringRedisTemplate">
            <property name="connectionFactory" ref="jedisConnectionFactory"/>
        </bean>
    </beans>

redis.properties:

redis.maxIdle=5
    redis.maxActive=10
    redis.maxWait=1000
    redis.testOnBorrow=true
    redis.sentinel.master=mymaster
    redis.sentinel.password=system
    redis.sentinel1.host=192.168.10.237
    redis.sentinel1.port=26379

注意：上面的端口是sentinel的端口，不是redis实例的端口。这里的例子只使用了一个sentinel.

测试代码：

@Test
    public void testSentinelBySpring() {
        ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext_redis_sentinel.xml");
        StringRedisTemplate redisTemplate = ctx.getBean(StringRedisTemplate.class);
        Collection<RedisServer> redisServers = redisTemplate.getConnectionFactory().getSentinelConnection().masters();
        System.out.println(redisServers);
        String key = "test";
        String value = redisTemplate.opsForValue().get(key);
        System.out.println(value);
         redisServers = redisTemplate.getConnectionFactory().getSentinelConnection().masters();
         System.out.println(redisServers);
         redisTemplate.opsForValue().set(key,"New Master...");
         value = redisTemplate.opsForValue().get(key);
         System.out.println(value);
     }

jedisConnFactory中配置的是master的ip和端口，端口不是sentinel的端口，是redis实例的端口（在redis.conf中配置的）。  
redisSentinelConfiguration的sentinels属性配置的是哨兵，用于监控master，在确认master宕掉后根据一定的算法从哨兵中拿一个提升为master。

说下使用的Jar的版本：  
spring:3.2.10.RELEASE  
jedis:2.5.2  
spring-data-redis:1.4.1.RELEASE  
可能还依赖其他的一些jar，比如jackson。