Add working demo

.gitignore

@@ -1,224 +1 @@
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+sample-app/

1_setup.sh

@@ -0,0 +1,45 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+export DOMAIN=app.cloud.gov
+
+fail() {
+  echo $@
+  exit 1
+}
+
+if [ -z "${APP_NAME}" ]; then
+  fail "Must set base APP_NAME environment variable"
+fi
+
+cf check-route $DOMAIN --hostname $APP_NAME | 
+  grep -q 'Route.*does not exist' || fail "APP_NAME $APP_NAME is already taken, try again"
+
+#  reserve route for later use
+cf create-route $DOMAIN --hostname $APP_NAME 
+
+[ -r sample-app/manifest.yml ] || git clone https://github.com/cloudfoundry-tutorials/sample-app.git ./sample-app
+
+
+A_APP_NAME="a-${APP_NAME}"
+cf push "${A_APP_NAME}" --path ./sample-app -f app_manifest.yml \
+  --var app_name="${A_APP_NAME}" --var test_var=TEST_A
+
+B_APP_NAME="b-${APP_NAME}"
+cf push "${B_APP_NAME}" --path ./sample-app -f app_manifest.yml \
+  --var app_name="${B_APP_NAME}" --var test_var=TEST_B
+
+
+echo "We can cheat A/B testing by mapping both hosts to the same route"
+set -x
+cf map-route ${A_APP_NAME} $DOMAIN --hostname ${APP_NAME}-x
+cf map-route ${B_APP_NAME} $DOMAIN --hostname ${APP_NAME}-x
+set +x
+
+echo ========================================
+echo "Visit https://${APP_NAME}-x.app.cloud.gov"
+echo "Then run "2_demo.sh"
+echo ========================================
+
+
+exit 0

2_demo.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+export DOMAIN=app.cloud.gov
+
+fail() {
+  echo $@
+  exit 1
+}
+
+if [ -z "${APP_NAME}" ]; then
+  fail "Must set base APP_NAME environment variable"
+fi
+
+cf push $APP_NAME -f proxy/manifest.yml --path proxy --var proxy-app-name="${APP_NAME}" 
+
+echo "Now visit https://$APP_NAME.$DOMAIN"
+
+exit 0

3_fix.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+export DOMAIN=app.cloud.gov
+
+fail() {
+  echo $@
+  exit 1
+}
+
+if [ -z "${APP_NAME}" ]; then
+  fail "Must set base APP_NAME environment variable"
+fi
+
+cf add-network-policy $APP_NAME a-${APP_NAME} --protocol tcp --port 8080
+cf add-network-policy $APP_NAME b-${APP_NAME} --protocol tcp --port 8080

4_testing.sh

@@ -0,0 +1 @@
+watch -n 1 -d "curl -s https://$APP_NAME.app.cloud.gov | grep TRAINING"

5_reweight.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+export DOMAIN=app.cloud.gov
+
+fail() {
+  echo $@
+  exit 1
+}
+
+set -x
+cf set-env $APP_NAME WEIGHTING "80% version_a; * version_b;"
+cf restart $APP_NAME
+set +x

6_all_b.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+export DOMAIN=app.cloud.gov
+
+fail() {
+  echo $@
+  exit 1
+}
+
+set -x
+cf set-env $APP_NAME WEIGHTING "100% version_b; * version_a;"
+cf restage --strategy rolling  $APP_NAME
+set +x

README.md

@@ -1,3 +1,51 @@
-# Github templates
+# Sample app
 
-This repo contains Github templates (pull request, issue, etc) for the cloud-gov organization.
+This is a sample application written in Go used for training purposes.
+
+## Demonstrating A/B Testing
+
+1. Show two apps pushed to the same route, that differ only in their env variable:
+
+```
+git checkout tags/works-w-simple-routing
+# update manifests to have non-conflictint routes
+for i in a_manifest.yml b_manifest.yml ; do cf push -f $i; done
+```
+
+Reload route and you'll see the apps getting cycles.
+
+Problem: These are balanced 50/50. Also, no session persisten
+
+2. Use a proxy 
+
+
+cf add-network-policy pb-ab-test sample-app-a --protocol tcp --port 8080-8443
+cf add-network-policy pb-ab-test sample-app-b --protocol tcp --port 8080-8443
+
+
+cf network-policies | awk 'f;/source/{f=1}' | awk '{printf "cf remove-network-policy %s %s --protocol %s --port %s\n", $1, $2, $3, $4}'
+
+# README
+
+This project demonstrates hosting a private intranet application on cloud.gov using Cloud Foundry's Route Service feature.
+
+```mermaid
+flowchart LR
+    subgraph "Cloud.gov"
+        direction LR
+        lb["Load Balancers"]
+        rtr["Routers"]
+        proxy["Weighted Proxy Service)"]
+        app_a["app_a.apps.internal"]
+        app_b["app_b.apps.internal"]
+
+        lb --> rtr
+        rtr --> proxy
+        proxy --> app_a
+        proxy --> app_b
+    end
+```
+
+## Requirements
+
+Install and log into the [Cloud Foundry CLI](https://docs.cloudfoundry.org/cf-cli/install-go-cli.html).