Redis Connection Modes

• Redis는 다양한 setup 환경에서 동작할 수 있고. 각 환경마다의 별도 설정이 필요

Redis Standalone

• single Redis Server를 사용할 때 가장 쉬운 방법

@Configuration
class RedisStandaloneConfiguration {

  /**
   * Lettuce
   */
  @Bean
  public RedisConnectionFactory lettuceConnectionFactory() {
    return new LettuceConnectionFactory(new RedisStandaloneConfiguration("server", 6379));
  }

  /**
   * Jedis
   */
  @Bean
  public RedisConnectionFactory jedisConnectionFactory() {
    return new JedisConnectionFactory(new RedisStandaloneConfiguration("server", 6379));
  }
}

 

Write to Master, Read From Replica

• failover 설정 없이 master/replica setup을 사용
• 장점
  • 더 많은 노드에 데이터를 분산 저장
  • write/read를 동시에 처리 가능

@Configuration
class WriteToMasterReadFromReplicaConfiguration {

  @Bean
  public LettuceConnectionFactory redisConnectionFactory() {

    LettuceClientConfiguration clientConfig = LettuceClientConfiguration.builder()
      .readFrom(REPLICA_PREFERRED)
      .build();

    RedisStandaloneConfiguration serverConfig = new RedisStandaloneConfiguration("server", 6379);

    return new LettuceConnectionFactory(serverConfig, clientConfig);
  }
}

 

Redis Sentinel

• high-availability를 위한 sentinel 사용을 위한 setup

/**
 * Lettuce
 */
@Bean
public RedisConnectionFactory lettuceConnectionFactory() {
  RedisSentinelConfiguration sentinelConfig = new RedisSentinelConfiguration()
  .master("mymaster")
  .sentinel("127.0.0.1", 26379)
  .sentinel("127.0.0.1", 26380);
  return new LettuceConnectionFactory(sentinelConfig);
}

/**
 * Jedis
 */
@Bean
public RedisConnectionFactory jedisConnectionFactory() {
  RedisSentinelConfiguration sentinelConfig = new RedisSentinelConfiguration()
  .master("mymaster")
  .sentinel("127.0.0.1", 26379)
  .sentinel("127.0.0.1", 26380);
  return new JedisConnectionFactory(sentinelConfig);
}

 

Redis cluster

• redis cluster 사용을 위한 setup

@Component
@ConfigurationProperties(prefix = "spring.redis.cluster")
public class ClusterConfigurationProperties {

    /*
     * spring.redis.cluster.nodes[0] = 127.0.0.1:7379
     * spring.redis.cluster.nodes[1] = 127.0.0.1:7380
     * ...
     */
    List<String> nodes;

    /**
     * Get initial collection of known cluster nodes in format {@code host:port}.
     *
     * @return
     */
    public List<String> getNodes() {
        return nodes;
    }

    public void setNodes(List<String> nodes) {
        this.nodes = nodes;
    }
}

@Configuration
public class AppConfig {

    /**
     * Type safe representation of application.properties
     */
    @Autowired ClusterConfigurationProperties clusterProperties;

    public @Bean RedisConnectionFactory connectionFactory() {

        return new LettuceConnectionFactory(
            new RedisClusterConfiguration(clusterProperties.getNodes()));
    }
}