Serverless in docker example

docker-compose.yml

version: '3.7'

services:
  appName:
    build: { context: . }
    ports: ['3000:3000', '3002:3002']

Dockerfile

FROM node:12-alpine

WORKDIR /app

COPY tsconfig.json ./
COPY serverless.yml ./
COPY package.json ./
COPY package-lock.json ./
RUN npm ci

COPY . .

EXPOSE 3000
EXPOSE 3002

CMD ["node", "./node_modules/serverless/bin/serverless.js", "offline", "start",  "--host", "0.0.0.0"]

If you have any issues with connecting to your database with environment variables you also might have to update your connection string in the docker-compose file like so:

  appName:
    build: { context: . }
    ports: ['3000:3000', '3002:3002']
    environment:
-      TYPEORM_URL: postgres://user:pass@localhost/dbName
+      TYPEORM_URL: postgres://user:pass@postgres/dbName