I am working on a Docker setup for a Node.js application that involves a multi-stage build and uses Sequelize for database migrations. However, I’m facing issues with script execution and volume mounting, leading to failures when the Docker container starts.

Environment Details:

• Dockerfile:

FROM node:14
ARG ENVIRONMENT_NAME
ARG BUILD_NAME
RUN mkdir -p /app-build
ADD . /app-build
WORKDIR /app-build
RUN --mount=type=cache,target=/root/.yarn YARN_CACHE_FOLDER=/root/.yarn yarn --frozen-lockfile
RUN yarn
RUN yarn build:$BUILD_NAME

FROM node:14-alpine
ARG ENVIRONMENT_NAME
ARG BUILD_NAME
RUN mkdir -p /dist
RUN apk add yarn
RUN yarn global add [email protected]
RUN yarn add shelljs bull dotenv pg [email protected] nyc

ADD scripts/e2etest.sh /
ADD package.json /
ADD . /
COPY --from=0 /app-build/dist ./dist

CMD ["sh", "./e2etest.sh"]
EXPOSE 9010

• Docker Compose:

version: '3'
services:
  db_postgres:
    image: postgres
    ports:
      - 5432:5432
    restart: always
    env_file:
      - .env.docker
    networks:
      - keploy-network

  redis:
    image: 'redis:alpine'
    ports:
      - '6379:6379'
    command: ['redis-server', '--bind', 'redis', '--port', '6379']
    networks:
      - keploy-network

  app:
    container_name: custom_app
    build:
      context: .
      args:
        ENVIRONMENT_NAME: .docker
        BUILD_NAME: docker
    restart: always
    depends_on:
      - db_postgres
      - redis
    ports:
      - 9010:9010
    env_file:
      - ./.env.docker
    networks:
      - keploy-network
    volumes:
      - /Users/shivamsouravjha/samples-typescript/node-express-graphql-template/.nyc_output:/dist/.nyc_output
    

networks:
  keploy-network:
    external: true

• e2etest.sh Script:

#!/bin/sh
set -a . ".env$ENVIRONMENT_NAME" set +a
sleep 10
echo $BUILD_NAME
if [ "$BUILD_NAME" == "local" ]
then
    npx sequelize-cli db:drop
    npx sequelize-cli db:create
fi
echo $LD_PRELOAD
npx sequelize-cli db:migrate

# Seed data for local builds
if [ "$BUILD_NAME" == "local" ]
then
    for file in seeders/*
    do
        npx sequelize-cli db:seed --seed $file
    done
fi

yarn e2etets
# docker cp custom_app:/app-build/dist/nyc_output ./nyc_output_host

The question I’ve is Why might the /dist/.nyc_output directory be locked or busy in this Docker setup?

I get the error of

I’m looking for a fix on the volume mounting, so that the nyc output can be copied from docker image to host machine