Scaling the app

Changes to the examples

Images

Steps for the previous assignment

  • File db.env 
    POSTGRES_DB=web_app_db
POSTGRES_USER=app
POSTGRES_PASSWORD=secret
  • File app.env 
    POSTGRES_DB=web_app_db
POSTGRES_USER=app
POSTGRES_PASSWORD=secret
POSTGRES_HOST=pg

Commands

docker network create mynet
docker container run --network mynet --env-file db.env -v pgdata:/var/lib/postgresql/data -d --name pg postgres:9.6.6-alpine
docker container run --network mynet --env-file app.env -d --name webapp jfahrer/demo_web_app:latest
docker container run --network mynet -e PROXY_UPSTREAM=webapp:9292 -d -p 80:80 --name lb jfahrer/lb:latest

Using the load balancer

Introduction