josecho / docker-react Goto Github PK

When adding volumes and volume bookmarking to the docker run command you see these errors in your terminal:

"Failed to compile.

EACCES: permission denied, mkdir '/app/node_modules/.cache'"

There is an issue with permissions in regards to Linux hosts (which includes Windows WSL2) and volumes. It can be solved by doing the following:

FROM node:alpine

USER node

RUN mkdir -p /home/node/app WORKDIR /home/node/app

COPY --chown=node:node ./package.json ./ RUN npm install COPY --chown=node:node ./ ./

CMD ["npm", "start"]

Remember to update the working directory paths in your docker run command to /home/node/app instead of just /app

eg:

docker run -it -p 3000:3000 -v /home/node/app/node_modules -v ~/my-project-directory:/home/node/app IMAGE_ID

When we refactor to use Docker Compose, remember to update the working directory paths in your compose file:

volumes:

volumes:
  - /home/node/app/node_modules
  - .:/home/node/app

Explanation of changes:

We are specifying that the USER which will execute RUN, CMD, or ENTRYPOINT instructions will be the node user, as opposed to root (default).

https://docs.docker.com/engine/reference/builder/#user

We are then creating a directory of /home/node/app prior to the WORKDIR instruction. This will prevent a permissions issue since WORKDIR by default will create a directory if it does not exist and set ownership to root.

The inline chown commands will set ownership of the files you are copying from your local environment to the node user in the container.

The end result is that some files and directories will no longer be owned by root, and no npm processes will be run by the root user. Instead, they will all be owned and run by the node user.

The code above was taken from this thread:

nodejs/docker-node#740

moby/moby#36408

Also, you can read up on the chown flag for the COPY instruction here:

https://docs.docker.com/engine/reference/builder/#copy