I’m new to docker and I’ve created a dockerfile but am having difficulties with my docker-compose file. I’m currently getting the error services.web.ports must be a list. I have a node app.js file that handles requests and prints data from database and an index.js file that looks like this
"use strict";
console.log("entrypoint");
const app = require("./app/app.js");
My Dockerfile looks like this:
FROM node:latest
WORKDIR /src
COPY package*.json /src/
RUN npm install
COPY . /src
EXPOSE 3000
And this is what my current docker-compose file looks like
version: '3.3'
services:
app:
build:
context: ./
volumes:
- .:/src
ports:
-"3000:3000"
depends_on:
- db
db:
image: mysql
restart: always
environment:
MYSQL_ALLOW_EMPTY_PASSWORD: true
MYSQL_DATABASE: world
MYSQL_USER: root
MYSQL_PASSWORD: null
ports:
- "3308:3306"
volumes:
- db:/var/lib/mysql
I wrote this based on an example, and I know it’s faulty and would appreciate any guidance. If I were to run the app.js file alone via node it works fine but I’m trying to implement docker to my project and need help.
>Solution :
The service for app has a typo in the ports section. A list is indented entries prefixed by a - . The line here is missing the space:
ports:
-"3000:3000"
Fix that by adding a space:
ports:
- "3000:3000"