hello-cloud

hello world example for Multicloud applications

Demo

Start the stack

docker-compose -f docker-compose.yml build
docker-compose -f docker-compose.yml up

UI served via Global Load Balancer -> Regional Load Balancer Linkerd -> Region Compute (node.js)

Access live version of the app http://localhost:9000

Oh no! A 404 page.

We can navigate to an upstream application routing-by-convention : http://localhost:9000/live/hello-cloud-app/hello

Let's add a Route using traffic-director:

curl -X POST \
  http://localhost:8080/api/v1/routes \
  -H 'Accept: application/json' \
  -H 'Content-Type: application/json' \
  -d '{"path":"/cloud","upstream":{"locator":{"service":"hello-cloud-app"}}}'

Verify that Route was added to traffic-director. In this reference implementation load balancers can poll a simple microservice for updates to the routing data: http://localhost:8080/api/v1/routes/entries

[
    {
        "path": "/cloud", // "vanilla" URL path that maps to any host
        "uri": "/hello-cloud-app" // Service Discovery path for a Consul service in any available region
    },
    {
        "path": "www.homeaway.com/hello", // host and path mapping to support different hosts
        "uri": "/hello-cloud-app" //
    },
    {
        "path": "/cloud/v/ce6836c6-7ca5-4944-8285-647aa9ae39b6", // variant defined as part of the routable path
        "uri": "/live/hello-cloud-app" // Service Discovery path for a Consul tag and service in any available region
    },
    {
        "path": "/cloud/f/84f88ddb-1ceb-4d52-b51a-66ff18d84191", // fallback defined as part of the routable path
        "uri": "/fallback/hello-cloud-app" // Service Discovery path for a Consul tag and service in any available region
    }
]