Added docker multi-container example (pulumi#1022)

* Added example for a multi-container application

* Fixing linting errors

docker-ts-multi-container-app/.gitignore

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+/bin/
+/node_modules/

docker-ts-multi-container-app/Pulumi.yaml

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+name: docker-ts-multi-container-app
+runtime: nodejs
+description: Example app using multiple docker containers

docker-ts-multi-container-app/README.md

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+[![Deploy](https://get.pulumi.com/new/button.svg)](https://app.pulumi.com/new)
+
+# Docker multi-container example
+
+This example Pulumi application runs two containers locally, one Redis container and one built from the application in the `app` folder. The application queries the Redis database and returns the number of times the page has been viewed.
+
+## Prerequisites
+
+To run this example, make sure [Docker](https://docs.docker.com/engine/installation/) is installed and running.
+
+## Running the App
+
+1. Create a new stack:
+
+ ```
+ $ pulumi stack init containers-dev
+ ```
+
+1. Restore NPM modules via `npm install` or `yarn install`.
+
+1. Preview and deploy the app via `pulumi up`. The preview will take a few minutes, as it builds a Docker container. A total of 19 resources are created.
+
+ ```
+ $ pulumi up
+ ```
+
+ ```
+ Updating (dev)
+
+ View Live: https://app.pulumi.com/acmecorp/docker-ts-multi-container-app/dev/updates/1
+
+ Type Name Status
+ + pulumi:pulumi:Stack docker-ts-multi-container-app-dev created
+ + ├─ docker:image:Image appImage create
+ + ├─ docker:index:Network network create
+ + ├─ docker:index:RemoteImage redisImage create
+ + ├─ docker:index:Container redisContainer create
+ + └─ docker:index:Container appContainer create
+
+ Diagnostics:
+ docker:image:Image (appImage):
+ warning: #1 [internal] load build definition from Dockerfile
+ #1 sha256:0d4d685ddff69a0240b26fdc352c1ce914133b71c905d1fa977c90c87fd2146a
+ #1 transferring dockerfile: 36B done
+ #1 DONE 0.4s
+
+ #2 [internal] load .dockerignore
+ #2 sha256:24180ce9fb5e863c8cdccc1dd5cecca0118d138fd1a387c2ba99c0bd73eb0b46
+ #2 transferring context: 2B done
+ #2 DONE 0.5s
+
+ #3 [internal] load metadata for docker.io/library/node:16-alpine
+ #3 sha256:93febbdbcf5a756e6e084d46d56976a0630ae35cc38d744d3fb69ab9a7ce9b20
+ #3 DONE 0.7s
+
+ #4 [1/5] FROM docker.io/library/node:16-alpine@sha256:6b56197d33a56cd45d1d1214292b8851fa1b91b2ccc678cee7e5fd4260bd8fae
+ #4 sha256:155f61a07d0d5bd3922125fe0a1f61b6ad7c80fd53ad17af2014022698792303
+ #4 DONE 0.0s
+
+ #6 [internal] load build context
+ #6 sha256:de51bb2a6c39944feaa85aac4b0ef727d42885f4ce1547e0d76a290b76cdb7ec
+ #6 transferring context: 62B done
+ #6 DONE 0.2s
+
+ #5 [2/5] WORKDIR /app
+ #5 sha256:36e7704b507e21cfc90eb97c19f220899eebe00ef73ab450f2f9b689e02e3154
+ #5 CACHED
+
+ #7 [3/5] COPY package.json .
+ #7 sha256:54933f5857daeae271dc204a253bbf96c17b66dac0dc2a94dfc082a68964cb6d
+ #7 CACHED
+
+ #8 [4/5] RUN npm i
+ #8 sha256:75557c22149d35804b54234ece9155528520503babaad06969c30e8d0b5af67d
+ #8 CACHED
+
+ #9 [5/5] COPY index.js .
+ #9 sha256:704a81bac2b5e5318ca3a0ca730516ff27bec81defa1333e99b1d5b31cf8835d
+ #9 CACHED
+
+ #10 exporting to image
+ #10 sha256:e8c613e07b0b7ff33893b694f7759a10d42e180f2b4dc349fb57dc6b71dcab00
+ #10 exporting layers done
+ #10 writing image sha256:9ec8e52bb05a93f69a72db72407265586836d85a612578c39c6883b291c18ce3
+ #10 writing image sha256:9ec8e52bb05a93f69a72db72407265586836d85a612578c39c6883b291c18ce3 0.1s done
+ #10 naming to docker.io/library/app done
+ #10 DONE 0.3s
+
+ Outputs:
+ url: "http:https://localhost:3000"
+
+ Resources:
+ + 6 created
+
+ Duration: 19s
+ ```
+
+1. View the endpoint URL, and run curl:
+
+ ```bash
+ $ pulumi stack output
+ Current stack outputs (1)
+ OUTPUT VALUE
+ url http:https://localhost:3000
+
+ $ curl $(pulumi stack output url)
+ I have been viewed 1 times
+ ```
+
+1. Repeat the previous command multiple times to see the number of views increase.
+
+## Clean up
+
+To clean up resources, run `pulumi destroy` and answer the confirmation question at the prompt.

docker-ts-multi-container-app/app/Dockerfile

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+FROM node:16-alpine
+WORKDIR /app
+
+COPY package.json .
+RUN npm i
+COPY index.js .
+
+EXPOSE 3000
+
+CMD [ "npm", "start" ]

docker-ts-multi-container-app/app/index.js

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+const express = require("express");
+const redis = require("redis");
+
+const app = express();
+const redisPort = process.env.REDIS_PORT
+const redisHost = process.env.REDIS_HOST;
+const redisClient = redis.createClient(redisPort, redisHost);
+const redisKey = "numHits";
+
+app.get("/", (req, res) => {
+ redisClient.get(redisKey, async (err, redisData) => {
+ if(err) throw err;
+
+ if(redisData) {
+ console.log(redisData);
+ let jsonData = JSON.parse(redisData);
+ let currentVisits = jsonData.num;
+ let data = {num: currentVisits + 1};
+ redisClient.set(redisKey, JSON.stringify(data));
+ res.send(`I have been viewed ${currentVisits} times.`);
+ } else {
+ let data = {num: 1};
+ redisClient.set(redisKey, JSON.stringify(data));
+ res.send(`I have been viewed ${data.num} time.`)
+ }
+ })
+});
+
+app.listen(3000, () => {
+ console.log("Node server started");
+ console.log(`Redis Host: ${redisHost}`);
+ console.log(`Redis Port: ${redisPort}`);
+});

docker-ts-multi-container-app/app/package.json

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+{
+ "name": "app",
+ "version": "1.0.0",
+ "description": "",
+ "main": "index.js",
+ "scripts": {
+ "start": "node ."
+ },
+ "author": "",
+ "license": "ISC",
+ "dependencies": {
+ "express": "^4.17.1",
+ "redis": "^3.1.2"
+ }
+}

docker-ts-multi-container-app/index.ts

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+// Copyright 2016-2021, Pulumi Corporation. All rights reserved.
+
+import * as docker from "@pulumi/docker";
+import * as pulumi from "@pulumi/pulumi";
+
+// Set defaults for redis
+const redisPort = 6379;
+const redisHost = "redisdb";
+
+// Create docker network
+const network = new docker.Network("network", {
+ name: "services",
+});
+
+// Get redis image
+const redisImage = new docker.RemoteImage("redisImage", {
+ name: "redis:6.2",
+ keepLocally: true,
+});
+
+// Run redis image
+const redisContainer = new docker.Container("redisContainer", {
+ image: redisImage.latest,
+ ports: [
+ { internal: redisPort, external: redisPort},
+ ],
+ networksAdvanced: [
+ {name: network.name, aliases: [redisHost]},
+ ],
+});
+
+// Create image from local app
+const appImage = new docker.Image("appImage", {
+ build: {
+ context: "./app",
+ },
+ imageName: "app",
+ skipPush: true,
+});
+
+// Set external port for app url
+const appPort = 3000;
+
+// Run container from local app image
+const appContainer = new docker.Container("appContainer", {
+ image: appImage.baseImageName,
+ ports: [
+ {internal: appPort, external: appPort},
+ ],
+ envs: [
+ pulumi.interpolate`REDIS_HOST=${redisHost}`,
+ pulumi.interpolate`REDIS_PORT=${redisPort}`,
+ ] ,
+ networksAdvanced: [
+ {name: network.name},
+ ],
+}, {dependsOn: [redisContainer]});
+
+export const url = pulumi.interpolate`http:https://localhost:${appPort}`;

docker-ts-multi-container-app/package.json

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+{
+ "name": "docker-ts-multi-container-app",
+ "devDependencies": {
+ "@types/node": "^10.0.0"
+ },
+ "dependencies": {
+ "@pulumi/docker": "^3.0.0",
+ "@pulumi/pulumi": "^3.0.0"
+ }
+}

docker-ts-multi-container-app/tsconfig.json

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+{
+ "compilerOptions": {
+ "strict": true,
+ "outDir": "bin",
+ "target": "es2016",
+ "module": "commonjs",
+ "moduleResolution": "node",
+ "sourceMap": true,
+ "experimentalDecorators": true,
+ "pretty": true,
+ "noFallthroughCasesInSwitch": true,
+ "noImplicitReturns": true,
+ "forceConsistentCasingInFileNames": true
+ },
+ "files": [
+ "index.ts"
+ ]
+}