Redis主从复制和主从切换
jopen
8年前
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。
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配置主从复制
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建立从文件夹，譬如 /usr/local/slaves/下建立 6380 6381 两个文件夹（两个从服务器）
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复制redis.conf到刚建立的两个文件夹中
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修改redis.conf 中的
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port 6380
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slaveof 127.0.0.1 6379 ------ip表示主服务器的ｉｐ 端口表示主服务器端口
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保存退出，另一个从服务器做同样修改，如果端口不是6380，修改断开即可，此处修改为6381
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启动主服务器 redis-server redis.conf
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进入从服务器文件夹，启动从服务器
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查看主服务器信息：redis-cli -p 6379 info Replication,可以看到有两个从服务器
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redis-cli -p 6379 进去主服务器，存储数据 set key val
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进入从服务器，redis-cli -p 6380 查看数据 get key 查看是否能取出数据
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配置主从切换
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新建文件 sentinel.conf
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编辑文件
####master sentinel.conf ##sentinel实例之间的通讯端口 port 26379 ####sentinel需要监控的master信息：<mastername> <masterIP> <masterPort> <quorum>. ####<quorum>应该小于集群中slave的个数,只有当至少<quorum>个sentinel实例提交"master失效" 才会认为master为ODWON("客观"失效) . sentinel monitor mymaster 127.0.0.1 6381 1 sentinel down-after-milliseconds mymaster 1000 sentinel failover-timeout mymaster 180000 sentinel parallel-syncs mymaster 1-
其他两个文件只需要修改端口即可
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启动redis-sentinel sentinel.conf &
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通过java读写主从服务器
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需要添加Spring配置和其他两个ｊａｒ包
<properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <springVersion>3.2.9.RELEASE</springVersion> </properties> <dependencies> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-pool2</artifactId> <version>2.4.2</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-context</artifactId> <version>${springVersion}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>${springVersion}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId> <version>${springVersion}</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>junit</groupId> <artifactId>junit</artifactId> <version>4.8</version> <scope>test</scope> </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>2.4.2</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>-
Spring配置
<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="127.0.0.1"></constructor-arg> <constructor-arg name="port" value="26479"></constructor-arg> </bean> <bean class="org.springframework.data.redis.connection.RedisNode"> <constructor-arg name="host" value="127.0.0.1"></constructor-arg> <constructor-arg name="port" value="26579"></constructor-arg> </bean> </set> </property> </bean> <bean id="jeidsConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory"> <constructor-arg ref="redisSentinelConfiguration"/> </bean> <bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate"> <property name="connectionFactory" ref="jeidsConnectionFactory"/> </bean>
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java测试
import org.junit.Before; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import org.springframework.dao.DataAccessException; import org.springframework.data.redis.connection.RedisConnection; import org.springframework.data.redis.core.RedisCallback; import org.springframework.data.redis.core.RedisTemplate; /** * Created by vincent on 15-10-13. */ public class CommonTest { private ApplicationContext context ; private RedisTemplate redisTemplate; final String key ="key7"; @Before public void init(){ context = new ClassPathXmlApplicationContext("applicationContext.xml"); redisTemplate= context.getBean("redisTemplate",RedisTemplate.class); } @Test public void test1(){ redisTemplate.execute(new RedisCallback() { @Override public Long doInRedis(RedisConnection redisConnection) throws DataAccessException { redisConnection.set(key.getBytes(),(System.currentTimeMillis()+"").getBytes()); return 1L; } }); } @Test public void test2(){ Object execute = redisTemplate.execute(new RedisCallback() { @Override public Object doInRedis(RedisConnection redisConnection) throws DataAccessException { return redisConnection.get(key.getBytes()); } }); System.out.println(new String((byte[])execute)); } }
参考文档：
http://redis.readthedocs.org/en/latest/topic/sentinel.html
来自：http://my.oschina.net/vincentzhao/blog/516245