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redis的sentinel主从切换(failover)与Jedis线程池自动重连
本文介绍如何通过sentinel监控redis主从集群,并通过jedis自动切换ip和端口。
1、配置redis主从实例
10.93.21.21:6379
10.93.21.21:6389
10.93.21.21:6399
主从同步关系
master:10.93.21.21:6379
slave:10.93.21.21:6389,10.93.21.21:6399
master配置如下:
# 实例ip和端口 bind 10.93.21.21 port 6379 # pid文件 pidfile redis_6379.pid # 日志文件 logfile "/home/data_monitor/redis-3.2.9/log/6379.log" # 持久化数据文件dir dir /home/data_monitor/redis-3.2.9/data # rdb 文件地址 dbfilename 6379.rdb # aof 文件地址 appendfilename "6379.aof"
slave配置如下(以6389为例)
# 实例ip和端口 bind 10.93.21.21 port 6389 # master节点配置 slaveof 10.93.21.21 6379 # pid文件 pidfile redis_6389.pid # 日志文件 logfile "/home/data_monitor/redis-3.2.9/log/6389.log" # 持久化数据文件dir dir /home/data_monitor/redis-3.2.9/data # rdb 文件地址 dbfilename 6389.rdb # aof 文件地址 appendfilename "6389.aof"
启动redis
bin/redis-server conf/6379.conf bin/redis-server conf/6389.conf bin/redis-server conf/6399.conf
验证一下
master
$ bin/redis-cli -h 10.93.21.21 -p 6379 10.93.21.21:6379> info replication # Replication role:master connected_slaves:2 slave0:ip=10.93.21.21,port=6389,state=online,offset=571888,lag=1 slave1:ip=10.93.21.21,port=6399,state=online,offset=571888,lag=1 master_repl_offset:571888 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:2 repl_backlog_histlen:571887
slave
$ bin/redis-cli -h 10.93.21.21 -p 6389 10.93.21.21:6389> info replication # Replication role:slave master_host:10.93.21.21 master_port:6379 master_link_status:up master_last_io_seconds_ago:1 master_sync_in_progress:0 slave_repl_offset:530211 slave_priority:100 slave_read_only:1 connected_slaves:0 master_repl_offset:0 repl_backlog_active:0 repl_backlog_size:1048576 repl_backlog_first_byte_offset:0 repl_backlog_histlen:0
2、配置sentinel集群
10.93.21.21:26379
10.93.21.21:26389
10.93.21.21:26399
启动所有的节点,只要监控同一个redis master,启动的话自动连接成集群
# sentinel注册的IP和端口 bind 10.93.21.21 port 26379 # working目录 dir /home/data_monitor/redis-3.2.9/sentinel # sentinel监控哪个主节点 sentinel monitor mymaster 10.93.21.21 6379 1 # 主节点挂掉多长时间,判定为挂掉,开始failover sentinel down-after-milliseconds mymaster 10000 # failover交由几个sentinel执行 sentinel parallel-syncs mymaster 1 # failover多长时间没完成,超时失败 sentinel failover-timeout mymaster 180000
启动sentinel集群
bin/redis-sentinel conf/s26379.conf bin/redis-sentinel conf/s26389.conf bin/redis-sentinel conf/s26399.conf
3、jedis自动切换ip和端口
先解决依赖:pom.xml
<dependency> <groupId>org.springframework.data</groupId> <artifactId>spring-data-redis</artifactId> <version>1.0.2.RELEASE</version> </dependency> <dependency> <groupId>redis.clients</groupId> <artifactId>jedis</artifactId> <version>2.7.0</version> <type>jar</type> <scope>compile</scope> </dependency>
连接池代码
public class JedisPoolUtil { private static JedisSentinelPool pool = null; public static Properties getJedisProperties() { Properties config = new Properties(); InputStream is = null; try { is = JedisPoolUtil.class.getClassLoader().getResourceAsStream("cacheConfig.properties"); config.load(is); } catch (IOException e) { logger.error("", e); } finally { if (is != null) { try { is.close(); } catch (IOException e) { logger.error("", e); } } } return config; } /** * 创建连接池 * */ private static void createJedisPool() { // 建立连接池配置参数 JedisPoolConfig config = new JedisPoolConfig(); Properties prop = getJedisProperties(); // 设置最大连接数 config.setMaxTotal(StringUtil.nullToInteger(prop.getProperty("MAX_ACTIVE"))); // 设置最大阻塞时间,记住是毫秒数milliseconds config.setMaxWaitMillis(StringUtil.nullToInteger(prop.getProperty("MAX_WAIT"))); // 设置空间连接 config.setMaxIdle(StringUtil.nullToInteger(prop.getProperty("MAX_IDLE"))); // jedis实例是否可用 boolean borrow = prop.getProperty("TEST_ON_BORROW") == "false" ? false : true; config.setTestOnBorrow(borrow); // 创建连接池 // pool = new JedisPool(config, prop.getProperty("ADDR"), StringUtil.nullToInteger(prop.getProperty("PORT")), StringUtil.nullToInteger(prop.getProperty("TIMEOUT")));// 线程数量限制,IP地址,端口,超时时间 //获取redis密码 String password = StringUtil.nullToString(prop.getProperty("PASSWORD")); String masterName = "mymaster"; Set<String> sentinels = new HashSet<String>(); sentinels.add("192.168.137.128:26379"); sentinels.add("192.168.137.128:26380"); sentinels.add("192.168.137.128:26381"); pool = new JedisSentinelPool(masterName, sentinels, config); } /** * 在多线程环境同步初始化 */ private static synchronized void poolInit() { if (pool == null) createJedisPool(); } /** * 获取一个jedis 对象 * * @return */ public static Jedis getJedis() { if (pool == null) poolInit(); return pool.getResource(); } /** * 释放一个连接 * * @param jedis */ public static void returnRes(Jedis jedis) { pool.returnResource(jedis); } /** * 销毁一个连接 * * @param jedis */ public static void returnBrokenRes(Jedis jedis) { pool.returnBrokenResource(jedis); } public static void main(String[] args){ Jedis jedis=getJedis(); } }
redis的sentinel主从切换(failover)与Jedis线程池自动重连
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