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I have a spring-config-sever project that I am trying to run via Docker. I can run it from the command line and my other services and browser successfully connect via:

http://localhost:8980/aservice/dev

However, if I run it via Docker, the call fails.

My config-server has a Dockerfile:

FROM openjdk:8-jdk-alpine
VOLUME /tmp
ARG JAR_FILE=build/libs/my-config-server-0.1.0.jar
ADD ${JAR_FILE} my-config-server-0.1.0.jar
EXPOSE 8980
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/my-config-server-0.1.0.jar"]

I build via:

docker build -t my-config-server .

I am running it via:

docker run my-config-server -p 8980:8980

And then I confirm it is running via

docker ps

CONTAINER ID        IMAGE                      COMMAND                  CREATED             STATUS              PORTS               NAMES
1cecafdf99fe        my-config-server   "java -Djava.securit…"   14 seconds ago      Up 13 seconds       8980/tcp            suspicious_brahmagupta

When I run it via Docker, the browse fails with a "ERR_CONNECTION_REFUSED" and my calling services fails with:

Could not locate PropertySource: I/O error on GET request for "http://localhost:8980/aservice/dev": Connection refused (Connection refused);

sonoerin
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    Looks like host port is not mapped. Try `docker run -p 8980:8980 my-config-server`. – Imran Dec 30 '18 at 18:46
  • Possible duplicate of [Docker - SpringConfig - Connection refused to ConfigServer](https://stackoverflow.com/questions/43005558/docker-springconfig-connection-refused-to-configserver) – Btc Sources Dec 30 '18 at 18:49
  • I think this is a good start - by changing my command per Imran, I am able to run the config server in Docker, and view the properties in a browser. However, other Dockerized services are still getting the `c.c.c.ConfigServicePropertySourceLocator : Could not locate PropertySource: I/O error on GET request for "http://localhost:8980/aservice/dev": Connection refused `. I am launching those services via : `docker run -e "SPRING_PROFILES_ACTIVE=dev" -p 3009:8980 -t aservice ` – sonoerin Dec 30 '18 at 19:53

2 Answers2

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Adding full answer based on comments.

First, you have to specify -p before image name. docker run -p 8980:8980 my-config-server.

Second, just configuring localhost with host port won't make your my-service container to talk to other container. locahost in container is within itself(not host). You will need to use appropriate docker networking model so both containers can talk to each other.

If you are on Linux, the default is Bridge so you can configure my-config-server container ip docker inspect {containerIp-of-config-server} as your config server endpoint.

Example if your my-config-server ip is 172.17.0.2 then endpoint is - http://172.17.0.2:8980/

spring:
  cloud:
    config:
      uri: http://172.17.0.2:8980

Just follow the docker documentation for little bit more understanding on how networking works. https://docs.docker.com/network/network-tutorial-standalone/ https://docs.docker.com/v17.09/engine/userguide/networking/

If you want to spin up both containers using docker-compose, then you can link both containers using service name. Just follow Networking in Compose.

Imran
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    Thank you for the excellent answer. I found my local ip via "ifconfig" on my Mac. I then passed it in via: `docker run -e "SPRING_PROFILES_ACTIVE=dev" -e "SPRING_CLOUD_CONFIG_URL=HTTP://10.0.0.143:8980" -p 3009:8980 -t my-config-server` – sonoerin Dec 30 '18 at 21:39
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I could imagine that the application only listens on localhost, ie 127.0.0.1.

You might want to try setting the property server.address to 0.0.0.0. Then port 8980 should also be available externally.

Robert Panzer
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