Add docker support

app/Dockerfile

@@ -0,0 +1,14 @@
+FROM node:lts
+
+WORKDIR /app
+
+# Install all dependencies.
+COPY package.json ./
+COPY package-lock.json ./
+RUN npm install
+
+COPY public/ ./
+COPY server.js ./
+
+EXPOSE 3000
+ENTRYPOINT ["npm", "run", "start"]

app/docker-compose.yml

@@ -0,0 +1,15 @@
+version: "3.6"
+services:
+  webserver:
+    build:
+      context: ./
+    ports:
+      - 3000:3000
+    environment:
+      MONGO_URL: "mongodb://mongodb/mirrordb"
+  mongodb:
+    image: mongo:latest
+    volumes:
+      - mongoData:/data/db
+volumes:
+  mongoData:

app/server.js

@@ -2,7 +2,7 @@ const express = require("express");
 const mongoose = require("mongoose");
 
 //url param indicates machine mongodb is running on /nameOfDatabase
-mongoose.connect("mongodb://localhost/mirrordb");
+mongoose.connect(process.env.MONGO_URL || "mongodb://localhost/mirrordb");
 
 
 // https://learn.zybooks.com/zybook/UMASSCOMPSCI326RichardsAcademicYear2020/chapter/11/section/8
@@ -33,4 +33,4 @@ app.get("/create", (req,res) => {
 
 //serve static files from public dir
 app.use(express.static("public"));
-app.listen(3000);
+app.listen(3000);