docker-compose up gives 'failed to read dockerfile: error from sender'

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Tried to simply dockerize my mongodb and spring boot application. Had a lot of struggles and thought I almost had it running and than the terminal hits me with this error:

Building user
[+] Building 0.0s (1/2)
 => ERROR [internal] load build definition from Dockerfile                                                                                                                         0.0s
 => => transferring dockerfile: 121B                                                                                                                                               0.0s
------
 > [internal] load build definition from Dockerfile:
------
failed to solve with frontend dockerfile.v0: failed to read dockerfile: error from sender: walk \\?\C:\Users\ZRC\Documents\GitHub\s6-kwetter-backend\user\Dockerfile: The system cannot
find the path specified.
ERROR: Service 'user' failed to build : Build failed

Dockerfile (which is in a sub-directory; user-module):

FROM openjdk:11
EXPOSE 8081
ADD target/user-module-docker.jar user-docker.jar
CMD ["java", "-jar", "user-docker.jar"]

docker-compose.yml (which is in the main directory that has multiple modules/microservices):

version: '3.8'

services:
  user:
    build: ./user/Dockerfile
    restart: unless-stopped
    container_name: user-ms
    ports:
    - 8081:8080
  mongodb:
    image: mongo
    restart: always
    container_name: mongodb
    ports:
      - 27017:27017

Like it says that the path specified cannot be found but it literally exists, so where could I have gone wrong?

dockerfile docker-compose spring-boot docker
1 Answers

The error is telling you that the Dockerfile was not found, because the path doesn't exist. That's because it is trying to enter the path as folder.

The system cannot find the path specified.

This comes because you made a mistake in the compose build syntax. There are 2 ways it can be used.

1. The simple form:

This is using ./users/ as context, expecting a Dockerfile to be in this directory.

user:
  build: ./user

2. The complex form:

user:
  build:
    context: ./
    dockerfile: ./users/Dockerfile

This lets you separate the context and where the Dockerfile is. In this example, the current folder is used as context, and the Dockerfile is taken from ./users/Dockerfile. It is also useful when you have a different name for your Dockerfile. I.E. Dockerfile.dev.

Note that this is just an example, I don't know if this would make sense in your project. You need to know what context is the correct one.

What do I mean by context?

The docker build command builds Docker images from a Dockerfile and a “context”. A build’s context is the set of files located in the specified PATH or URL. The build process can refer to any of the files in the context. For example, your build can use a COPY instruction to reference a file in the context.

As example:

docker build --file /path/to/Dockerfile /path/to/context
user_92088870
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