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

Question

I am getting Unable to connect to Redis;nested exception is io.lettuce.core.RedisConnectionException using RedisTemplate error when I try to connect azure redis cache from my spring reactive application.

I have configured below in properties file

spring.redis.host=hostName 
spring.redis.port=6379 
spring.redis.password=password

also tried java based configuration using LettuceConnectionFactory

• krishg: Can you tell more about the configuration code you have written? Also, see if this helps stackoverflow.com/questions/60872465/…

Answer 1

I have encountered the same problem when enabling password authentication in AWS ElastiCache because of not using SSL for the Redis client.

Bellow RedisConfig.java uses SSL to connect and my error disappeared. I am using Spring Reactive by the way.

@Configuration
@ConfigurationProperties(prefix = "spring.redis")
@Setter
public class RedisConfig {
 private String host;
 private String password;
 @Bean
 @Primary
 public ReactiveRedisConnectionFactory reactiveRedisConnectionFactory(RedisConfiguration defaultRedisConfig) {
 LettuceClientConfiguration clientConfig = LettuceClientConfiguration.builder()
 .useSsl().and()
 .commandTimeout(Duration.ofMillis(60000)).build();
 return new LettuceConnectionFactory(defaultRedisConfig, clientConfig);
 }
 @Bean
 public RedisConfiguration defaultRedisConfig() {
 RedisStandaloneConfiguration config = new RedisStandaloneConfiguration();
 config.setHostName(host);
 config.setPassword(RedisPassword.of(password));
 return config;
 }
}

Answer 2

Make Sure to use jedisConFactory.setUseSsl(true); for aws redis connection. By Default ssl is off for redis connection.

 @Bean
 JedisConnectionFactory jedisConnectionFactory() {
 final JedisPoolConfig jedisPoolConfig = new JedisPoolConfig();
 jedisPoolConfig.setMaxTotal(300);
 jedisPoolConfig.setMaxIdle(20);
 jedisPoolConfig.setMaxWaitMillis(2000);
 jedisPoolConfig.setBlockWhenExhausted(true);
 JedisConnectionFactory jedisConFactory = new JedisConnectionFactory(jedisPoolConfig);
 jedisConFactory.setHostName(redisHost);
 jedisConFactory.setPort(redisPort);
 jedisConFactory.setPassword(redisPassword);
 jedisConFactory.setUsePool(true);
 jedisConFactory.setTimeout(redisTimeout);
 jedisConFactory.setUseSsl(redisSsl);
 return jedisConFactory;
 }
 @Bean(name = "redisTemplate")
 public RedisTemplate<String, Object> redisTemplate() {
 RedisTemplate<String, Object> template = new RedisTemplate<>();
 template.setConnectionFactory(jedisConnectionFactory());
 //template.setEnableTransactionSupport(true);
 template.setExposeConnection(true);
 template.afterPropertiesSet();
 return template;
 }