Does not work with Docker Swarm.

[MauroOyhanart]

I'm risking looking like an idi*t, but I'm starting to learn Docker Swarm and I got to this great example. I think it's designed to work out of the box, but it does not seem like it, so I'm making an issue in case somebody has the same problem.

General description of the problem: Does not work with Docker Swarm out of the box.

You initialize the swarm (Docker playground). Only one node from simplicity.

You execute the indicated command docker stack deploy -c docker-stack.yml vote

And the web services do not load in the page.

Steps to reproduce the issue:

1. You initialize the swarm (Docker playground). Only one node from simplicity.
2. You execute the indicated command docker stack deploy -c docker-stack.yml vote
3. And the web services do not load in the page.

I tried to see if it was the environment (Docker Pground), so I pulled a test image

docker pull kennethreitz/httpbin
docker run -p 8080:80 kennethreitz/httpbin

The above DOES work. Which means the environment by itself can open ports/show web services.

Describe the results you received:
The web services do not load in the page.

Describe the results you expected:
And the web services do load in the page.

Output of docker version:

Client:
 Version:           27.3.1
 API version:       1.47
 Go version:        go1.22.7
 Git commit:        ce12230
 Built:             Fri Sep 20 11:39:44 2024
 OS/Arch:           linux/amd64
 Context:           default

Server: Docker Engine - Community
 Engine:
  Version:          27.3.1
  API version:      1.47 (minimum version 1.24)
  Go version:       go1.22.7
  Git commit:       41ca978
  Built:            Fri Sep 20 11:41:02 2024
  OS/Arch:          linux/amd64
  Experimental:     true
 containerd:
  Version:          v1.7.22
  GitCommit:        7f7fdf5fed64eb6a7caf99b3e12efcf9d60e311c
 runc:
  Version:          1.1.14
  GitCommit:        v1.1.14-0-g2c9f560
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

Output of docker info:

$ docker info
Client:
 Version:    27.3.1
 Context:    default
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc.)
    Version:  v0.17.1
    Path:     /usr/local/libexec/docker/cli-plugins/docker-buildx
  compose: Docker Compose (Docker Inc.)
    Version:  v2.29.7
    Path:     /usr/local/libexec/docker/cli-plugins/docker-compose
  scout: Docker Scout (Docker Inc.)
    Version:  v1.0.9
    Path:     /usr/lib/docker/cli-plugins/docker-scout

Server:
 Containers: 8
  Running: 7
  Paused: 0
  Stopped: 1
 Images: 6
 Server Version: 27.3.1
 Storage Driver: overlay2
  Backing Filesystem: xfs
  Supports d_type: true
  Using metacopy: false
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Cgroup Version: 1
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local splunk syslog
 Swarm: active
  NodeID: nq97nidjyq5yivrqh3who2bp2
  Is Manager: true
  ClusterID: mh6pqpiwlbsy7cwp1q20r8hqn
  Managers: 1
  Nodes: 3
  Data Path Port: 4789
  Orchestration:
   Task History Retention Limit: 5
  Raft:
   Snapshot Interval: 10000
   Number of Old Snapshots to Retain: 0
   Heartbeat Tick: 1
   Election Tick: 10
  Dispatcher:
   Heartbeat Period: 5 seconds
  CA Configuration:
   Expiry Duration: 3 months
   Force Rotate: 0
  Autolock Managers: false
  Root Rotation In Progress: false
  Node Address: 192.168.0.12
  Manager Addresses:
   192.168.0.12:2377
 Runtimes: io.containerd.runc.v2 runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 7f7fdf5fed64eb6a7caf99b3e12efcf9d60e311c
 runc version: v1.1.14-0-g2c9f560
 init version: de40ad0
 Security Options:
  apparmor
  seccomp
   Profile: builtin
 Kernel Version: 4.4.0-210-generic
 Operating System: Alpine Linux v3.20 (containerized)
 OSType: linux
 Architecture: x86_64
 CPUs: 8
 Total Memory: 31.42GiB
 Name: node1
 ID: 0d947af3-49dd-4127-901d-6ae13791da8d
 Docker Root Dir: /var/lib/docker
 Debug Mode: true
  File Descriptors: 106
  Goroutines: 261
  System Time: 2024-11-25T04:45:38.29298998Z
  EventsListeners: 7
 Experimental: true
 Insecure Registries:
  127.0.0.1
  127.0.0.0/8
 Registry Mirrors:
  https://mirror.gcr.io/
 Live Restore Enabled: false
 Product License: Community Engine

[DEPRECATION NOTICE]: API is accessible on http://0.0.0.0:2375 without encryption.
         Access to the remote API is equivalent to root access on the host. Refer
         to the 'Docker daemon attack surface' section in the documentation for
         more information: https://docs.docker.com/go/attack-surface/
In future versions this will be a hard failure preventing the daemon from starting! Learn more at: https://docs.docker.com/go/api-security/
WARNING: No swap limit support
WARNING: bridge-nf-call-iptables is disabled
WARNING: bridge-nf-call-ip6tables is disabled

Additional environment details:
Docker Playground -> regular instance.

$ cat /etc/os-release 
NAME="Alpine Linux"
ID=alpine
VERSION_ID=3.20.3
PRETTY_NAME="Alpine Linux v3.20"
HOME_URL="https://alpinelinux.org/"
BUG_REPORT_URL="https://gitlab.alpinelinux.org/alpine/aports/-/issues"