Question 220188 in Ubuntu Question posted in
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Ubuntu – Why can't an app inside a docker container access it's own API endpoint?

I use the docker desktop app on Windows.
Inside a Ubuntu WSL2 I have a docker container with a meteor / nodejs server running.
Started via docker-compose from inside the WSL.

docker-compose.yaml
  ...
  environment:
    - ROOT_URL=http://localhost:8080
    - PORT=8080
  ports:
    - "8080:8080"

Now the app inside the docker container must access an HTTP endpoint of itself like http://127.0.0.1:8080/api

When I call the this endpoint from outside the docker, I get the correct result.
When I connect into the docker container with a terminal and curl the endpoint, I get the correct result.
But, when the running app / service running inside the container tries to call itself by the same endpoint with the same URL, I get a ECONNREFUSED - CONNECTION REFUSED error.

What could be the problem of this? Maybe a WSL2 security problem?

Tags:

2

Answers


  1. 0

    I can’t say anything for sure without looking at the actual code or seeing the full error message, but try to replace your

    - ROOT_URL=http://localhost:8080

    with

    - ROOT_URL=http://127.0.0.1:8080

    And if you have any other places with localhost url, replace them as well.

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  2. 0

    I also can’t say anything certainly without looking at the code or error, but have you tried replacing the localhost with the name of the container within the compose file?

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