Incomplete pool runner doc

[denismakogon]

Pool runner doc misses FN_PUBLIC_LB_URL configuration which makes the deployment broken.

[michael-w-williams]

Denis, What changes do I need to make to https://github.com/fnproject/docs/blob/master/fn/operate/runner_pools.md? Does the Env var need to be set as a first step? What would a sample value look like?

[denismakogon]

Well, my answer wouldn't be easy. So, the following env var needs to be set in docker run for API node. By itself, this env var represents a public (reachable through the internet) IP address of the LB container.
So, missing steps here are:

1. Deploy API container at the end.
2. When LB container deployed - check its IP address (that could be docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' <lb-container>).
3. Add -e FN_PUBLIC_LB_URL=http://<lb-container-ip>:<lb-container-http-port>

The most crucial part here is Fn CLI simple test. Since this type of the deployment is not usual to anyone expect us, you need to show the following things:

1. Create a new context with API container IP address.
2. Deploy hello-world.
3. Inspect a function, highlight the annotation because it would be different compared to regular annotation you'd get from FN running throughfn start.
4. Call a function with both an HTTP trigger and invoke.