Updated Docker container, broke webui (port 80 issue)

[wir3dal]

I have been using the p2g-api and p2g-webui for several months, but made the mistake of updating the container images recently and broke the webui container. I'm pretty sure this happened a few weeks ago and I was able to fix it - but now I'm stuck again and out of ideas! The p2g-api container starts up fine but the p2g-webui crashes with the port 80 permission issue. I tried running the container with the higher permission setting with no luck.

This is on a Synology NAS. I'm using the Docker Compose file from the wiki

version: "3.9"

services:
  p2g-api:
    container_name: p2g-api
    image: philosowaffle/peloton-to-garmin:api-latest
    network_mode: bridge
    environment:
      - TZ=America/New_York
    ports:
      - 8001:8080 # to access the api or swagger docs
    volumes:
      - /volume1/docker/p2g-webui/api.local.json:/app/configuration.local.json
      - /volume1/docker/p2g-webui/data:/app/data
      - /volume1/docker/p2g-webui/output:/app/output
      - /volume1/docker/p2g-webui/deviceInfo.xml:/app/deviceInfo.xml
  
  p2g-webui:
    container_name: p2g-webui
    image: philosowaffle/peloton-to-garmin:webui-latest
    network_mode: bridge
    ports:
      - 8002:8080
    environment:
      - TZ=America/New_York
    volumes:
      - /volume1/docker/p2g-webui/api.local.json:/app/configuration.local.json
    depends_on:
      - p2g-api

My configuration.local.json and api.local.json files both have the proper :8080 ports. Here is the log file for reference.

[10:39:33 INF] *********************************************
[10:39:33 INF] P2G Version: p2g_webui 3.5.1-rc
[10:39:33 INF] Operating System: Unix
[10:39:33 INF] OS Version: Unix 4.4.180.0
[10:39:33 INF] DotNet Runtime: Unix 4.4.180.0
[10:39:33 INF] Docker Deployment: True
[10:39:33 INF] Config path: /app/configuration.local.json
[10:39:33 INF] *********************************************
Unhandled exception. System.IO.IOException: Failed to bind to address http://localhost:80.
 ---> System.AggregateException: One or more errors occurred. (Permission denied) (Permission denied)
 ---> System.Net.Sockets.SocketException (13): Permission denied
   at System.Net.Sockets.Socket.UpdateStatusAfterSocketErrorAndThrowException(SocketError error, String callerName)
   at System.Net.Sockets.Socket.DoBind(EndPoint endPointSnapshot, SocketAddress socketAddress)
   at System.Net.Sockets.Socket.Bind(EndPoint localEP)

[wir3dal]

Well, after playing with this some more, I was able to resolve it! Two things I found:

1. I was pointing the p2g-webui configuration to the wrong file, it should have been

    volumes:
      - /volume1/docker/p2g-webui/webui.local.json:/app/configuration.local.json

This did not resolve the issue and gave me different errors in the log.

2. I needed to go into the Synology Docker dashboard and use the "Link" settings to point the p2g-api container to the link "pg2-api".

Now all is working well! My guess is that when I updated the docker images, it lost the Link setting.