interlock: Interlock does not generate/save proxy config files

I’m deploying interlock onto a swarm in Azure using the Azure Container Service template. It is basically a swarm with one master and a couple of nodes.

Here is my compose file:

version: '2'
volumes:
  haproxy:
services:
  # nginx service to serve static client files
  nginx:
    image: boilerangularloop/boilerangularloop_nginx
    restart: always
    ports:
      - '8080'
    labels:
        - "interlock.hostname=boilagents"
        - "interlock.domain=eastus.cloudapp.azure.com"

  #interlock
  interlock:
    image: ehazlett/interlock:1.1.0
    environment: 
        INTERLOCK_CONFIG: |
            ListenAddr = ":8080"
            DockerURL = "${SWARM_HOST}"

            [[Extensions]]
              Name = "haproxy"
              ConfigPath = "/usr/local/etc/haproxy/haproxy.cfg"
              PidPath = "/run/haproxy.pid"
              MaxConn = 1024
              Port = 80
              AdminUser = "admin"
              AdminPass = "interlock"
    command: -D run
    ports:
        - '8080:8080'
    volumes:
      - haproxy:/usr/local/etc/haproxy

  #loadbalancer
  haproxy:
    image: haproxy:latest
    ports:
        - '80:80'
        - '443:443'
    labels:
        - "interlock.ext.name=haproxy"
    depends_on: 
      - interlock
    volumes:
      - haproxy:/usr/local/etc/haproxy

I can see the haproxy volume being created and mounted however interlock doesn’t seem to generate the haproxy.cfg file and hence the haproxy service dies. Same happens if I use the nginx extension instead.

Here are the logs:

interlock_1 | time="2016-04-06T13:10:35Z" level=info msg="interlock 1.1.0 (8a68c99)"
interlock_1 | time="2016-04-06T13:10:35Z" level=debug msg="loading config from environment"
interlock_1 | time="2016-04-06T13:10:35Z" level=debug msg="docker client: url=tcp://172.16.0.5:2375"
interlock_1 | time="2016-04-06T13:10:35Z" level=debug msg="loading extension: name=haproxy"
interlock_1 | time="2016-04-06T13:10:35Z" level=info msg="interlock node: id=6a62b5554c670e663ae42b1d4f46bd46c4701e049fe252c8d8bfd6853f100f1e" ext=lb
interlock_1 | time="2016-04-06T13:10:35Z" level=debug msg="starting event handling"
interlock_1 | time="2016-04-06T13:10:35Z" level=debug msg="event received: status=interlock-start id=0 type= action="
interlock_1 | time="2016-04-06T13:10:35Z" level=debug msg="notifying extension: lb"
interlock_1 | time="2016-04-06T13:10:35Z" level=debug msg="triggering reload" ext=lb
interlock_1 | time="2016-04-06T13:10:36Z" level=debug msg="reaping key: reload"
interlock_1 | time="2016-04-06T13:10:36Z" level=debug msg="triggering reload from cache" ext=lb
interlock_1 | time="2016-04-06T13:10:36Z" level=debug msg="checking to reload" ext=lb
interlock_1 | time="2016-04-06T13:10:36Z" level=debug msg="updating load balancers" ext=lb
interlock_1 | time="2016-04-06T13:10:36Z" level=debug msg="generating proxy config" ext=lb
interlock_1 | time="2016-04-06T13:10:36Z" level=info msg="boilagents.eastus.cloudapp.azure.com: upstream=10.0.0.5:32799 container=vagrant_nginx_1" ext=haproxy
interlock_1 | time="2016-04-06T13:10:36Z" level=debug msg="alias domains: []" ext=haproxy
interlock_1 | time="2016-04-06T13:10:36Z" level=debug msg="adding host name=boilagents_eastus_cloudapp_azure_com domain=boilagents.eastus.cloudapp.azure.com" ext=haproxy
interlock_1 | time="2016-04-06T13:10:36Z" level=debug msg="proxy config path: /usr/local/etc/haproxy/haproxy.cfg" ext=lb
interlock_1 | time="2016-04-06T13:10:36Z" level=debug msg="saving proxy config" ext=lb
interlock_1 | time="2016-04-06T13:10:36Z" level=debug msg="calculating restart across interlock nodes: num=1" ext=lb
interlock_1 | time="2016-04-06T13:10:36Z" level=debug msg="proxy containers to restart: num=0 containers=" ext=lb
interlock_1 | time="2016-04-06T13:10:36Z" level=debug msg="signaling reload" ext=lb
interlock_1 | time="2016-04-06T13:10:36Z" level=debug msg="dropping SYN packets to trigger client re-send" ext=haproxy
interlock_1 | time="2016-04-06T13:10:36Z" level=debug msg="&{/sbin/iptables [/sbin/iptables -I INPUT -p tcp --dport 80 --syn -j DROP] []  <nil> <nil> <nil> [] <nil> <nil> <nil> <nil> false [] [] [] [] <nil>}" ext=haproxy
interlock_1 | time="2016-04-06T13:10:36Z" level=warning msg="error signaling clients to resend; you will notice dropped packets: exit status 3" ext=haproxy
interlock_1 | time="2016-04-06T13:10:36Z" level=debug msg="resuming SYN packets" ext=haproxy
interlock_1 | time="2016-04-06T13:10:36Z" level=debug msg="&{/sbin/iptables [/sbin/iptables -I INPUT -p tcp --dport 80 --syn -j DROP] []  <nil> <nil> <nil> [] <nil> <nil> <nil> <nil> false [] [] [] [] <nil>}" ext=haproxy
interlock_1 | time="2016-04-06T13:10:36Z" level=warning msg="error signaling clients to resume; you will notice dropped packets: exit status 3" ext=haproxy
interlock_1 | time="2016-04-06T13:10:36Z" level=debug msg="triggering proxy network cleanup" ext=lb
interlock_1 | time="2016-04-06T13:10:36Z" level=info msg="reload duration: 32.68ms" ext=lb
interlock_1 | time="2016-04-06T13:10:36Z" level=debug msg="checking to remove proxy containers from networks" ext=lb
haproxy_1   | <7>haproxy-systemd-wrapper: executing /usr/local/sbin/haproxy -p /run/haproxy.pid -f /usr/local/etc/haproxy/haproxy.cfg -Ds
haproxy_1   | [ALERT] 096/131038 (7) : Could not open configuration file /usr/local/etc/haproxy/haproxy.cfg : No such file or directory
haproxy_1   | <5>haproxy-systemd-wrapper: exit, haproxy RC=256
vagrant_haproxy_1 exited with code 0

As you see, it logs both generating and saving proxy config. But if I exec into the interlock container and look at the mounted volume, it remains empty. Any ideas?

Thanks!