node.js - Docker compose volume mapping with NodeJS app -

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i trying achieve incredibly basic, have been going @ couple of evenings , still haven't found solid (or any) solution. have found similar topics on , followed on there no avail, have created github repo specific case.

what i'm trying do:

  • be able provision nodejs app using docker-compose -d (i plan add further containers in future, omitted example)
  • ensure code mapped via volumes don't have re-build every time make change code locally.

my guess issue i'm encountering mapping of volumes causing files lost/overwritten within container, instance in of variations i've tried folders being mapped individual files not.

i've created simple repo illustrate issue, checkout , run docker-compose -d see issue, container dies due to:

error: cannot find module '/src/app/app.js'

the link repo here: https://github.com/josephmcdermott/nodejs-docker-issue, pr's welcome , if can solve me i'd eternally grateful.

update: please see solution code below, kind ldg

dockerfile

from node:4.4.7  run mkdir -p /src copy . /src workdir /src run npm install  expose 3000  cmd ["node", "/src/app.js"]

docker-compose.yml

app:   build: .   volumes:     - ./app:/src/app

folder structure:

- app - - * (files want sync , regularly update) - app.js (initial script call files within app/) - dockerfile - docker-compose.yml - package.json

in compose file, last line - /src/app/node_modules mapping on previous volume. if mount /scr/app node_modules created in linked volume. this:

app:   build: .   volumes:     - ./app:/src/app

if want keep entire /app directory linked volume, you'll need either npm install when starting container (which insure picks updates) or don't link volume , update dockerfile copy entire /app directory. nice because gives self-contained image. dockerize node.js apps way. can run npm test appropriate verify image.

if need create linked volume script file want able edit (or if app generates side-effects), can link directory or file via docker volumes.

btw, if want make sure don't copy contents of directory in future, add .dockerignore (as .gitignore).


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