Unable to connect to Redis； nested exception is io.lettuce.core.RedisConnectionException: Unable to

小鱼儿 2023-09-29 14:31 89阅读 0赞

***org.springframework.data.redis.RedisConnectionFailureException: Unable to connect to Redis; nested exception is io.lettuce.core.RedisConnectionException: Unable to connect to localhost/:6379***

**sprngboot整合redis很简单，之前使用也没有什么问题，基本操作通过redistemplate实现的，配置一下序列化方式就行，一般使用阿里的fastjson。当然也可以使用比较火的fastjson2。**  
至于yml的配置比较简单，不多赘述  
序列化：

@Bean
        public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory){
        
            RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>();
    
            redisTemplate.setConnectionFactory(redisConnectionFactory);
    
            FastJsonRedisSerializer<Object> redisSerializer = new FastJsonRedisSerializer<>(Object.class);
    
            redisTemplate.setHashKeySerializer(new StringRedisSerializer());
    
            redisTemplate.setHashValueSerializer(redisSerializer);
    
            redisTemplate.setKeySerializer(new StringRedisSerializer());
    
            redisTemplate.setValueSerializer(redisSerializer);
    
            // 初始化参数
            redisTemplate.afterPropertiesSet();
    
            return redisTemplate;
    
        }

1.其他设置正常的情况下，redis一直连接失败，之前没有设置LettuceConnectionFactory ，springboot项目正常启动，现在一直报错，连接的地址是locahost。而在yml配置的redis的地址为虚拟机地址。正常情况下不应该报错

2.配置redis的LettuceConnectionFactory 要设置连接地址和端口号  
3.

@Bean
        public  LettuceConnectionFactory lettuceConnectionFactory(){
        
    
    //        new RedisStandaloneConfiguration("192.168.1.6",6379)
            RedisStandaloneConfiguration redisStandaloneConfiguration = new RedisStandaloneConfiguration();
            redisStandaloneConfiguration.setHostName("192.168.1.6");
            redisStandaloneConfiguration.setPort(6379);
            redisStandaloneConfiguration.setDatabase(5);
            return  new LettuceConnectionFactory( redisStandaloneConfiguration);
        }

4.整合springcache的时候用到了LettuceConnectionFactory

@Bean
        public  CacheManager cacheManager(LettuceConnectionFactory factory){
        
    
            // 以锁写入的方式创建对象
            RedisCacheWriter writer = RedisCacheWriter.lockingRedisCacheWriter(factory);
    
            RedisCacheConfiguration configuration = RedisCacheConfiguration.defaultCacheConfig();
    
            return new RedisCacheManager(writer, configuration);
    
        }

5.spring boot data redis 官方文档关于LettuceConnectionFactory配置如下：

### **The following example shows how to create a new Lettuce connection factory:** ###

@Configuration
    class AppConfig {
        
    
      @Bean
      public LettuceConnectionFactory redisConnectionFactory() {
        
    
        return new LettuceConnectionFactory(new RedisStandaloneConfiguration("server", 6379));
      }
    }