Spring Boot Redis getting connection refused exception when using Redis

Question

I have a small application where use I use redis for cache and Spring Boot. Application runs successfully in local but when I try to dockerize it, I'm getting connection refuse exception.

It's my docker-compose.yml file:

version: '3.5'

services:
  my-application:
    image: my-application:latest
    container_name: my-application
    ports:
      - 8080:8080
    hostname: my-application

  redis:
    image: redis
    command: [ "redis-server", "--protected-mode", "no" ]
    volumes:
      - ./data:/data
    ports:
      - 6379:6379   

Dockerfile:

FROM openjdk:7

VOLUME /tmp

ADD my-application-0.0.1.jar my-application-0.0.1.jar

EXPOSE 8080

ENTRYPOINT ["java", "-Djava.security.egd=file:/dev/./urandom", "-jar", "my-application-0.0.1.jar"]

When I check docker console, I saw that redis starts in standalone mode

What I'm missing ?

Thanks

Answer 1

You have to set:

server.address=0.0.0.0

in your application.properties . If your application is listen on 127.0.0.1 in the container, you won't be able to reach it from your host.

Answer 2

You need to change the redis host to the name of the redis configuration in the docker compose file, in this case - redis

It can be configured by two ways:

• changing property file spring.redis.host=redis
• setting host in manual config (redis or jedis) redisStandaloneConfiguration.setHostName("redis");

Also, in my case, I did not use volume in my docker files, so to use the new jar file you need to do all 3 steps of launching docker compose ( apart from clean build in gradle or clean install in maven ):

• docker-compose down
• docker-compose build
• docker-compose up

I hope this is useful to someone! :)

Answer 3

I had the same issue and fixed with (docker-compose.yml)

 cache:
    image: redis
    ...
    ports:
      - 6379:6379  

then in application.properties spring.redis.host=cache

and eventually

@Value("${spring.redis.host}")
String redisHost
...
redisStandaloneConfiguration.setHostName(redisHost);

I think, in docker network, service name with same name of image is causing issues and ending with docker not being able to create connections to redis host.