Redis

Springdata

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

Client

The simplest and cleanest way to set up client is with application properties that are listed below.
Found here

spring.redis.host=aaa.bbb.ccc.ddd
spring.redis.port=eee

If for some reason this is not enough, client can be created with defining a JedisConnectionFactory @Bean.

@Bean
JedisConnectionFactory jedisConnectionFactory() {
  JedisConnectionFactory jedisConnectionFactory = new JedisConnectionFactory();
  jedisConnectionFactory.setHostName(redisIp);
  jedisConnectionFactory.setPort(redisPort);
  return jedisConnectionFactory;
}

For any additional settings, for example how keys and values should be serialized you can create RedisTemplate<String, Object> @Bean Example below:

@Bean
@Autowired
public RedisTemplate<String, Object> redisTemplate(JedisConnectionFactory connectionFactory) {
  final RedisTemplate<String, Object> template = new RedisTemplate<>();
  template.setConnectionFactory(connectionFactory);
  
  // Keys are saved and retrieved as strings
  template.setKeySerializer(new StringRedisSerializer());
  
  // In values whole object is saved so Jackson is used for transforming objects from and to string
  template.setValueSerializer(new GenericJackson2JsonRedisSerializer());
  return template;
}

Docker image

In redis.conf file settings for redis server can be set.
For example:

# Maximum memory is 100MB then start to remove keys 
maxmemory 104857600
# Remove all keys by LRU algorithm
maxmemory-policy allkeys-lru

Connect

docker exec -it [container-name] redis-cli

Queries

INFO [section]

Get info about server

RANDOMKEY

Return a random key from the currently selected database.

KEYS pattern

Returns all keys matching pattern.

Supported glob-style patterns: h?llo matches hello, hallo and hxllo h*llo matches hllo and heeeello h[ae]llo matches hello and hallo, but not hillo h[^e]llo matches hallo, hbllo, ... but not hello h[a-b]llo matches hallo and hbllo

AWS ElasticCache

Supports to deploy redis clusters: If you click on cluster then you see the endpoint to which you can connect with redis client.

rivancic/Redis-Spring-Data.md