spring-boot-redis-docker-demo

Demo of Spring boot app( docker container) connecting to redis(docker container)

This is a simple spring-boot app that connects to redis to store and retrive the data. Here Redis is used both as database and as well as caching system.

Step1 Create spring-boot-app

Create a spring-boot app with spring-boot-starter-web, spring-boot-starter-data-redis, jedis, lombok dependencies. Jedis is the java client used to connect to redis instance.

Add the below properties to application.properties file

server.port=8085
spring.redis.host=redis
spring.redis.port=6379

Provide a JedisConnectionFactory which is used for RedisTemplate as shown below.

@Bean
public JedisConnectionFactory jedisConnectionFactory() {
	RedisStandaloneConfiguration config = new RedisStandaloneConfiguration();
	config.setHostName(host);
	config.setPort(port);
	return new JedisConnectionFactory(config);
}
	
@Bean
public RedisTemplate<String, Object> redisTemplate(){
	RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>();
	redisTemplate.setConnectionFactory(jedisConnectionFactory());
	redisTemplate.setValueSerializer(new GenericToStringSerializer<Object>(Object.class));
	return redisTemplate;
}

Use this redisTemplate to do all the hashOperations like put, get etc

Step2 Create a Dockerfile for spring-boot-app

Create a Dockerfile as shown below

FROM openjdk:8
ADD target/spring-boot-redis.jar spring-boot-redis.jar
EXPOSE 8085
ENTRYPOINT ["java", "-jar", "spring-boot-redis.jar"]

Step3 Create a docker-compose file

Create a docker-compose.yml file as shown below. Here the app is binded to redis instance

version: '3'
services:
 app:
   build: .
   ports:
    - "8085:8085"
   links:
     - redis
 redis:
   image: redis
   ports:
    - "6379:6379"

Step 4 Execute

To execute this app

mvn clean install

docker-compose build

docker-compose up

Hit the following endpoint to post a record POST http://localhost:8085/api/employee

{
   "id": 1000,
   "firstName": "Chetan",
   "lastName": "Kamadinni"
}

To get the record do GET http://localhost:8085/api/employee/1000

Useful docker-compose commands