Docker build failing: 'failed to solve with frontend dockerfile.v0' error

Frontend
1

Hey everyone, I’m having trouble with my Docker build for a Gatsby app. When I try to build the image, I get this weird error:

failed to solve with frontend dockerfile.v0: failed to build LLB:
failed to compute cache key: "/.env" not found: not found

I’m using this Dockerfile:

FROM node:14

WORKDIR /myapp

COPY package.json ./

RUN npm install -g gatsby-cli

RUN npm install

COPY gatsby-config.js ./

COPY .env ./

EXPOSE 9000

CMD ["gatsby", "develop", "-H", "0.0.0.0"]

Any ideas what’s going wrong? I’m pretty new to Docker, so I’m not sure what this error means or how to fix it. Thanks for any help!

2

The error you’re encountering suggests that the .env file isn’t present in your build context when Docker tries to copy it. This is a common issue, especially when working with sensitive information.

To resolve this, you have a few options:

  1. Ensure your .env file is in the same directory as your Dockerfile.
  2. Use build arguments instead of copying the .env file directly.
  3. Consider using Docker secrets for handling sensitive data in production.

For development purposes, you could modify your Dockerfile to create a dummy .env file if it doesn’t exist:

COPY .env* ./ 2>/dev/null || :
RUN touch .env

This approach allows the build to continue even if the .env file is missing. Remember to gitignore your actual .env file to avoid exposing sensitive information in your repository.

3

hey there! have u considered using a .dockerignore file? it could help with that pesky .env issue. also, maybe try using docker-compose for local dev? it makes managing env vars way easier. just a thought! what’s ur experience with docker so far? any other cool projects you’re working on?

4

looks like ur .env file’s missing when docker tries to copy it. easy fix: make sure it’s in the same folder as ur Dockerfile. or, u could use build args instead of copying .env directly. for dev, try adding this to ur Dockerfile:

COPY .env* ./ 2>/dev/null || :
RUN touch .env

this’ll create a dummy .env if it’s not there. hope that helps!