docker-compose.yml

version: "3"
services:

# Core API services are pinned, HA is provided for functions.
    gateway:
        volumes:
            - "/var/run/docker.sock:/var/run/docker.sock"
        ports:
            - 8080:8080
        image: functions/gateway:0.5.6
        networks:
            - functions
        environment:
            dnsrr: "true"  # Temporarily use dnsrr in place of VIP while issue persists on PWD
        deploy:
            placement:
                constraints: [node.role == manager]

    # Accepts a UK postcode and returns the day length
    postcodedaylight:
        image: rgee0/postcodedaylight:latest
        labels:
            function: "true"
        depends_on:
            - gateway
        networks:
            - functions
        environment:
            fprocess: "/go/bin/postcodedaylight"
            no_proxy: "gateway"
            https_proxy: $https_proxy

networks:
    functions:
        driver: overlay
        # Docker does not support this option yet - maybe create outside of the stack and reference as "external"?
        #attachable: true