I am trying to create a node.js docker container for an api layer transpiled from typescript copied from a scr folder to a dist folder. The node.js container seems to exit immediately and when I issue docker-compose logs I get "Error: Cannot find module '/usr/src/app/webapp.js'", however, when I bring up the container with the -d option, I can see where the file and directory structure is in the correct hierarchical structure. What could be wrong here? Why is node not able to locate the webapp.js file?
Dockerfile:
FROM node:latest # install our dependencies and nodejs RUN mkdir -p /usr/src RUN mkdir -p /tmp/dist ADD Account/package.json /tmp/package.json RUN cd /tmp && npm install --production ADD Account/dist /tmp/dist RUN mkdir -p /tmp/node_modules/mongodb-repository ADD Account/node_modules/mongodb-repository /tmp/node_modules/mongodb-repository RUN mkdir -p /usr/src/app && cp -a /tmp/node_modules /usr/src/app && cp -a /tmp/package-lock.json /usr/src/app RUN cp -a /tmp/dist/application /usr/src/app && cp -a /tmp/dist/config /usr/src/app && cp -a /tmp/dist/domain /usr/src/app && cp -a /tmp/dist/infrastructure /usr/src/app RUN cp -a /tmp/dist/routes /usr/src/app && cp -a /tmp/dist/types /usr/src/app && cp -a /tmp/dist/webapp.js /usr/src/app && cp -a /tmp/package.json /usr/src/app RUN chmod 755 /usr/src/app/webapp.js RUN mkdir -p /usr/src/app/bin COPY Account/bin /usr/src/app/bin COPY Account/.env /usr/src/app/.env WORKDIR /usr/src/app CMD [ "node", "webapp.js" ] EXPOSE 3000 docker-compose.yml
version: '2' services: mongo: container_name: "app_mongo" tty: true image: mongo:latest environment: - MONGO_DATA_DIR=/data/db - MONGO_LOG_DIR=/dev/null - MONGO_INITDB_ROOT_USERNAME=******** - MONGO_INITDB_ROOT_PASSWORD=******** volumes: - /data/dbDocker:/data/db ports: - 27017:27017 command: "mongod --smallfiles --auth" rabbitmq: container_name: "app_rabbitmq" tty: true image: rabbitmq:management ports: - "15672:15672" - "15671:15671" - "5672:5672" volumes: - /rabbitmq/lib:/var/lib/rabbitmq - /rabbitmq/log:/var/log/rabbitmq - /rabbitmq/conf:/etc/rabbitmq/ group: container_name: "app_group" build: context: . dockerfile: ./Account/Dockerfile volumes: - ./Account:/usr/src/app/ ports: - "3000:3000" depends_on: - mongo - rabbitmq 1 Answers
Answers 1
During your image build, you install some things into /usr/src/app, and then you set it as the working directory. Here are the lines from Dockerfile where that happens:
RUN mkdir -p /usr/src RUN mkdir -p /usr/src/app && cp -a /tmp/node_modules /usr/src/app && cp -a /tmp/package-lock.json /usr/src/app RUN cp -a /tmp/dist/application /usr/src/app && cp -a /tmp/dist/config /usr/src/app && cp -a /tmp/dist/domain /usr/src/app && cp -a /tmp/dist/infrastructure /usr/src/app RUN cp -a /tmp/dist/routes /usr/src/app && cp -a /tmp/dist/types /usr/src/app && cp -a /tmp/dist/webapp.js /usr/src/app && cp -a /tmp/package.json /usr/src/app RUN chmod 755 /usr/src/app/webapp.js RUN mkdir -p /usr/src/app/bin COPY Account/bin /usr/src/app/bin COPY Account/.env /usr/src/app/.env WORKDIR /usr/src/app After the build phase, all of that is baked into your image and ready to be used. But at runtime, you told docker-compose:
volumes: - ./Account:/usr/src/app/ This is an overlay mount. Whatever is built into the image at /usr/src/app is completely ignored and replaced by the contents of ./Account from the directory where docker-compose.yml is located.
I don't know enough about your project to tell you how to properly fix this, but that's where your error is probably coming from. All the work done during build to construct /usr/src/app is being undone by mounting another directory on top of it at runtime.
If you remove that volume mount, all of /usr/src/app is still there and ready to use. But that may have other side effects that you will need to account for to make your app do its job.
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