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connection just hangs

Hi I am trying to follow this approach but the connection just hangs.

I started investigating, and I am not able to query the metrics from inside the any container. Outside the container it works fine. I have tried with docker0 and docker_gwbridge.

Here is one example with docker0

daemon.json

{
  "experimental" : true,
  "bip": "172.17.0.1/16",
  "metrics-addr" : "0.0.0.0:4999"
}

run test container in shared network

docker network create curlme
docker run --name socat --rm --network curlme alpine/socat -d -d TCP-L:4998,fork TCP:172.17.0.1:4999
docker run --rm --network curlme curlimages/curl -I socat:4998/metrics

2021/04/02 22:25:39 socat[1] W ioctl(5, IOCTL_VM_SOCKETS_GET_LOCAL_CID, ...): Not a tty
2021/04/02 22:25:39 socat[1] N listening on AF=2 0.0.0.0:4998
2021/04/02 22:27:02 socat[1] N accepting connection from AF=2 172.19.0.3:41258 on AF=2 172.19.0.2:4998
2021/04/02 22:27:02 socat[1] N forked off child process 9
2021/04/02 22:27:02 socat[1] N listening on AF=2 0.0.0.0:4998
2021/04/02 22:27:02 socat[9] N opening connection to AF=2 172.17.0.1:4999
2021/04/02 22:29:12 socat[9] E connect(5, AF=2 172.17.0.1:4999, 16): Operation timed out
2021/04/02 22:29:12 socat[9] N exit(1)
2021/04/02 22:29:12 socat[1] N childdied(): handling signal 17

When I do the same with docker swarm and 2 nodes, it hangs as well. In that case I am using the address of the docker_gwbrige. I create the bridge myself with fixed CIDR before joining the swarm.

docker network create \
--subnet 10.11.0.0/16 \
--opt com.docker.network.bridge.name=docker_gwbridge \
--opt com.docker.network.bridge.enable_icc=false \
--opt com.docker.network.bridge.enable_ip_masquerade=true \
docker_gwbridge

Then In the compose file for the stack deployment I run the image like so

  dockerd-exporter:
    image: alpine/socat
    networks:
      - monitoring
    command: -d -d TCP-L:4999,fork TCP:10.11.0.1:4999
    deploy:
      mode: global

And in Prometheus config

  - job_name: 'dockerd-exporter'
    dns_sd_configs:
    - names: [ tasks.dockerd-exporter ]
      port: 4999
      type: A

But Prometheus also gets timeout error for these targets. They are discovered, but metrics request times out.

Can you please give me a hint why this isn't working?

This is the full project I am working on https://github.com/bluebrown/linode-swarm

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