Barebones example of deploying the official Flex Gateway Docker image to Heroku.

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• A Heroku Account
• A MuleSoft CloudHub Account
• Docker desktop

1. Login to MuleSoft Anypoint and “Add a Flex Gateway” from here
2. Select Container > Docker (under Select your OS or environment) and run the command shown under “Register your gateway” replacing the <gateway-name> with a name of your choice
3. If the above command is executed without errors a registration.yaml file should have been created - the content of this file shall be added later as a Heroku configuration environment variable of your Heroku Flex Gateway app
4. The Flex Gateway created will appear under MuleSoft Anypoint > Runtime Manager > Flex Gateways and its status will be displayed as Disconnected.
5. Click the Heroku button below to deploy Flex Gateway on Heroku and fill in the required variables
6. The Flex Gateway created will appear under MuleSoft Anypoint > Runtime Manager > Flex Gateways and its status will be displayed as Connected. Clicking on it, under the APIs item on the left menu, it will be possible to create the APIs to be associated with it (“Add API” button).
7. As the Downstream Port of the API enter 2020 - it should match the value used for the FLEX_DYNAMIC_PORT_VALUE environment variable of your Heroku Flex Gateway app
8. Go under your Heroku app Settings tab and copy your app domain name (close to “Your app can be found at”), append to this URL your API Base path (if configured) and open the resulting link (e.g. with curl) - you should be redirected to the configured Upstream URL

• a sidecar envoy TCP proxy is used to forward the Heroku connections on $PORT to the Flex Gateway envoy proxy listening on $FLEX_DYNAMIC_PORT_VALUE
• to avoid ports clashing between $PORT and the Flex Gateway internal services using 127.0.0.1 interface and several ports (4000,9998,9999,15001,15002,15100), the interface used by the sidecar envoy proxy to listen on $PORT is not 0.0.0.0

• Tested with an API having an "IP Allowlist" policy
• Tested with an API having a "Rate Limiting" policy - this requires Heroku Data for Redis add-on and a specifc YAML configuration file under the /config directory (e.g. shared-storage-redis.configuration.yaml)

apiVersion: gateway.mulesoft.com/v1alpha1
kind: Configuration
metadata:
 name: shared-storage-redis
spec:
 sharedStorage:
   redis:
     address: <hostname>:<port>
     password: <password>
     tls:
        skipValidation: true
        minVersion: "1.1"
        maxVersion: "1.3"

This package has been tested using the following:

Credits to the owner of the original project I've exchanged with to make it work on Heroku Common Runtime and Private Spaces

You will need to create a Heroku account and install the Heroku CLI, eg. brew install heroku.

git clone [email protected]:garciarodrigor/heroku-docker-flex-gateway-example.git
cd heroku-docker-flex-gateway-example
heroku container:login
heroku create
heroku config:set FLEX_REGISTRATION=<registration-content> FLEX_SERVICE_ENVOY_CONCURRENCY=1 FLEX_DYNAMIC_PORT_VALUE=8081
heroku container:push web
heroku container:release web
heroku open