Redis & Spring Boot integration with K8S error - spring-boot

Question

I have the following docker file:
FROM openjdk:8-jdk-alpine
ENV PORT 8094
EXPOSE 8094
RUN mkdir -p /app/
COPY build/libs/fqdn-cache-service.jar /app/fqdn-cache-service.jar
WORKDIR /build
ENTRYPOINT [ "sh" "-c", "java -jar /app/fqdn-cache-service.jar" ]
docker-compose.yaml file:
version: '3'
services:
app:
build:
context: .
dockerfile: Dockerfile
image: fqdn-cache-service
ports:
- "8094:8094"
links:
- "db:redis"
db:
image: "redis:alpine"
#hostname: redis
ports:
- "6378:6378"
deployment.yaml file
apiVersion: apps/v1
kind: Deployment
metadata:
name: fqdn-cache-service
spec:
selector:
matchLabels:
run: spike
replicas: 1
template:
metadata:
labels:
app: redis
run: spike
spec:
containers:
- name: fqdn-cache-service
imagePullPolicy: Never
image: fqdn-cache-service:latest
ports:
- containerPort: 8094
protocol: TCP
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: redis
spec:
selector:
matchLabels:
run: spike
replicas: 1
template:
metadata:
labels:
run: spike
spec:
hostname: redis
containers:
- name: redis
image: redis:alpine
ports:
- containerPort: 6379
---
apiVersion: v1
kind: Service
metadata:
name: fqdn-cache-service
labels:
run: spike
spec:
type: NodePort
ports:
- port: 8094
nodePort: 30001
selector:
run: spike
---
apiVersion: v1
kind: Service
metadata:
name: redis
labels:
run: spike
app: redis
spec:
type: NodePort
ports:
- port: 6379
nodePort: 30002
selector:
run: spike
And the cluster info ip is 127.0.0.1.
I'm using microk8s over ubuntu OS.
If I request for get by and ID (127.0.0.1/webapi/users/1) I get the error:
Cannot get Jedis connection; nested exception is redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool
Although on regular java application with redis or dockerize spring boot with redis it's working.
Any help why this is happened?
This is the configuration of the spring boot:
#Configuration
public class ApplicationConfig {
#Bean
JedisConnectionFactory jedisConnectionFactory() {
JedisConnectionFactory factory = new JedisConnectionFactory();
factory.setHostName("127.0.0.1");
factory.setPort(30001);
factory.setUsePool(true);
return factory;
}
#Bean
RedisTemplate redisTemplate() {
RedisTemplate<String, FqdnMapping> redisTemplate = new RedisTemplate<String, FqdnMapping>();
redisTemplate.setConnectionFactory(jedisConnectionFactory());
return redisTemplate;
}
}
The issue also happenes if the host name is localhost and\or the port is 6379...
Thanks!

Answer 1

When you're running in a container, 127.0.0.1 usually refers to the container itself, not to the host the container is running on. If you're trying to connect to a service, try using its name and port: "redis" on port 6379 and "fqdn-cache-service" on 8094.