I'm running into a problem with docker that I can't fix by looking at other references, documentation, etc. and since i'm a beginner with Docker I try my luck here. I'm working in a Next.js project that is using Docker to build the app. I'm using the example documentation of Next.js, and that works if I have my Dockerfile in the root of my project. However, I want to put it in a folder called etc and use it from there. This is giving me problems, because docker can't find the files that i'm trying to copy to the working directory, see error below.

Structure

.
├── etc
│   └── Dockerfile
├── package.json
└── yarn.lock

Command

docker build etc/

Error

failed to compute cache key: "/yarn.lock" not found: not found

Dockerfile

FROM node:16-alpine AS deps
# Check https://github.com/nodejs/docker-node/tree/b4117f9333da4138b03a546ec926ef50a31506c3#nodealpine to understand why libc6-compat might be needed.
RUN apk add --no-cache libc6-compat
WORKDIR /app
COPY package.json yarn.lock ./
RUN yarn install --frozen-lockfile

I've tried a bunch of things, such as changing the files and paths. Also, in the documentation they mention the -f flag, but that doesn't work for me either because I get the error "docker build" requires exactly 1 argument. when running docker build -f etc/Dockerfile. Is that outdated? Anyway, my question is how to build my app with docker when my dockerfile is not in the root of the project but in a child folder like etc/.

CodePudding user response：

You have forgotten the dot at the end of the command docker build -f etc/Dockerfile .