Add the assignment

[refs #b1914ba49eb8]

Author: jfahrer

load_balancer/assignment2.md

@@ -0,0 +1,34 @@
+## Scaling the application
+### Current setup
+* 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
+```
+
+```
+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
+```
+
+### Use network aliases
+* Run the demo_web_app without a name
+* Assign the network alias `webapp`
+* Run multiple instances (5-10)
+* Browse localhost
+
+