Docker 在 nodejs 微服务应用程序中组合卷

Question

When make volumes in docker-compose.yml and run docker-compose up and in "yarn run" step, it says (error Couldn't find a package.json file in "/usr/src/app")

my Dockerfile

FROM node:12
RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app
COPY package.json .
COPY yarn.lock .
RUN yarn
COPY . .
CMD [ "yarn", "watch" ]

docker-compose.yml

version: "3"
services:
    listings-service:
        build: ./listings-service
        volumes:
            - ./listings-service:/usr/src/app

package.json

{
  "name": "listings-service",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "scripts": {
    "watch": "babel-watch -L ./index.js"
  },
  "devDependencies": {
    "babel-watch": "^7.0.0",
    "nodemon": "^2.0.2"
  },
  "dependencies": {
    "@babel/core": "^7.9.0",
    "@babel/polyfill": "^7.8.7",
    "@babel/preset-env": "^7.9.0",
    "babel-plugin-module-resolver": "^4.0.0",
    "core-js": "3"
  }
}

Answer 1

why do you need the volume here? your docker files compy all the files in and place them inside the docker image. In addition, running yarn will install dependencies and place them in /usr/src/app .

Adding the volume on the docker-compose ==> all files from the docker image will be removed and placed with the files inside the local path ./listings-service