Example from-docker : build fail : failed to compute cache key: "/yarn.lock" not found

[JulienCorb]

What example does this report relate to?

from-docker

What version of Next.js are you using?

latest

What version of Node.js are you using?

node:16-alpine

What browser are you using?

chrome

What operating system are you using?

macOS

How are you deploying your application?

sudo docker build -t myappname .

Describe the Bug

trace :

[+] Building 0.8s (11/19)                                                                                                         
 => [internal] load build definition from Dockerfile                                                                         0.0s
 => => transferring dockerfile: 37B                                                                                          0.0s
 => [internal] load .dockerignore                                                                                            0.0s
 => => transferring context: 34B                                                                                             0.0s
 => [internal] load metadata for docker.io/library/node:16-alpine                                                            0.7s
 => [internal] load build context                                                                                            0.0s
 => => transferring context: 4.03kB                                                                                          0.0s
 => [deps 1/5] FROM docker.io/library/node:16-alpine@sha256:2f50f4a428f8b5280817c9d4d896dbee03f072e93f4e0c70b90cc84bd1fcfe0  0.0s
 => CACHED [builder 2/5] WORKDIR /app                                                                                        0.0s
 => CACHED [runner 3/8] RUN addgroup -g 1001 -S nodejs                                                                       0.0s
 => CACHED [runner 4/8] RUN adduser -S nextjs -u 1001                                                                        0.0s
 => CACHED [deps 2/5] RUN apk add --no-cache libc6-compat                                                                    0.0s
 => CACHED [deps 3/5] WORKDIR /app                                                                                           0.0s
 => ERROR [deps 4/5] COPY package.json yarn.lock ./                                                                          0.0s
------
 > [deps 4/5] COPY package.json yarn.lock ./:
------
failed to compute cache key: "/yarn.lock" not found: not found

Expected Behavior

it should build the image with no error

To Reproduce

have Docker installed
run npx create-next-app --example with-docker myappname
run sudo docker build -t myappname .

NB : image build works when app gets created with yarn instead of npx

[balazsorban44]

The example is optimized to work with Yarn https://github.com/vercel/next.js/blob/canary/examples/with-docker/Dockerfile

When building, it is trying to copy over the yarn.lock file, but it does not exist on your system.

We could add a small note about that in the docs: https://nextjs.org/docs/deployment#docker-image

Would you like to open a PR?

[JulienCorb]

thank you @balazsorban44, yes I'll open a PR !

[fahmyfarahat]

Hi 👋 @JulienCorb, I can take this one if you didn't open PR.

[JulienCorb]

Haven't done it yet, go ahead @fahmyfarahat ! thank you 😃

[balazsorban44]

Heads up, there is already a PR for this at #33695 👍

[oelbaga]

I have tested this. It still fails with the same error. yarn.lock isn't being created after you run
docker build -t nextjs-docker . The issue only happens if you use npx

npx create-next-app --example with-docker nextjs-docker

The OP's original issue persists.

Even if you create yarn.lock manually before running you run into another error: ERROR [deps 5/5] RUN yarn install --frozen-lockfile

[balazsorban44]

Please check the Dockerfile in the example that is being cloned:

next.js/examples/with-docker/Dockerfile

Lines 6 to 11 in bf8b835

	COPY package.json yarn.lock ./
	RUN yarn install --frozen-lockfile
	# If using npm with a `package-lock.json` comment out above and use below instead
	# COPY package.json package-lock.json ./
	# RUN npm ci

[github-actions]

This closed issue has been automatically locked because it had no new activity for a month. If you are running into a similar issue, please create a new issue with the steps to reproduce. Thank you.