Add the env files and a list of commands to run the services

[refs #4359b29ceee4]

Author: jfahrer

swarm/swarm-demo/app.env

@@ -0,0 +1,4 @@
+POSTGRES_USER=demo
+POSTGRES_PASSWORD=secret
+POSTGRES_DB=demo
+POSTGRES_HOST=demo-db

swarm/swarm-demo/commands.md

@@ -0,0 +1,27 @@
+## The commands
+```sh
+#Make sure we don't have existing resources that would conflict with our commands
+docker network ls
+docker service ls
+
+# Create the network
+docker network create --driver overlay demo-net
+
+# Create the demo-db
+docker service create --name demo-db --reserve-memory 256M --constraint node.hostname==node1 \
+  --mount src=demo-data,dst=/var/lib/postgresql/data \
+  --env-file db.env \
+  --network demo-net \
+  jfahrer/swarm-demo-db:v1
+
+# Create the frontend
+docker service create --name demo-frontend --env-file app.env --network demo-net jfahrer/swarm-demo-frontend:v5
+
+# Create the lb
+docker service create --name demo-lb --publish 80:80 --env PROXY_UPSTREAM=demo-frontend:8080 \
+  --network demo-net jfahrer/swarm-demo-lb:v1
+
+# Scale the services
+docker service update --replicas 10 demo-frontend
+docker service update --replicas 3 demo-lb
+```

swarm/swarm-demo/db.env

@@ -0,0 +1,3 @@
+POSTGRES_USER=demo
+POSTGRES_PASSWORD=secret
+POSTGRES_DB=demo