Other container web service auto detection not working

The auto detection of another container's web ports does not seem to be working, at least as described in the README. Here is a minimal reproduction:

version: '2'

volumes:
  settings:

services:
  browser:
    restart: always
    image: bh.cr/balenalabs/browser-aarch64
    privileged: true
    volumes:
      - 'settings:/data'
    ports:
      - '5011' # management API (optional)
  web:
    restart: always
    image: nginx:1.25.2
    ports:
      - '80'

When starting, it will output:

[Logs]    [2023-10-03T00:26:12.869Z] [browser] LAUNCH_URL environment variable not set.
[Logs]    [2023-10-03T00:26:12.871Z] [browser] Looking for local HTTP/S services.
[Logs]    [2023-10-03T00:26:12.876Z] [browser] No service found on port 80
[Logs]    [2023-10-03T00:26:12.881Z] [browser] No service found on port 443
[Logs]    [2023-10-03T00:26:12.886Z] [browser] No service found on port 8080
[Logs]    [2023-10-03T00:26:12.887Z] [browser] Displaying default HTML page

If you force it to load web via the API, it will work fine:
```
ADDRESS=`sudo balena scan --json | jq -r '.[0].address'`
curl --data "url=web" http://$ADDRESS:5011/url
```
This will show the "welcome to nginx" page on the device

If you tell it to re-scan via the API, it still won't find the local container.

curl -X POST http://$ADDRESS:5011/scan

💩

[Logs]    [2023-10-03T00:34:14.361Z] [browser] LAUNCH_URL environment variable not set.
[Logs]    [2023-10-03T00:34:14.363Z] [browser] Looking for local HTTP/S services.
[Logs]    [2023-10-03T00:34:14.369Z] [browser] No service found on port 80
[Logs]    [2023-10-03T00:34:14.374Z] [browser] No service found on port 443
[Logs]    [2023-10-03T00:34:14.378Z] [browser] No service found on port 8080
[Logs]    [2023-10-03T00:34:14.383Z] [browser] Displaying default HTML page

but if you manually specify LAUNCH_URL to the other container...
```
services:
  browser:
    environment:
      LAUNCH_URL: http://web
```
... it works:

Hey Brian,I think the block container will need to be in host networking mode since it scans ports on the localhost:https://github.com/balena-labs-projects/browser/blob/master/src/server.js#L65The readme was recently updated to remove host networking to fix a problem with pulseaudio, but it seems more nuanced. Phil -------- Original message --------From: Brian Bugh @.> Date: 03/10/2023 01:43 (GMT+00:00) To: balena-labs-projects/browser @.> Cc: Subscribed @.***> Subject: [balena-labs-projects/browser] Other container web service auto detection not working (Issue #159) The auto detection of another container's web ports does not seem to be working, at least as described in the README. Here is a minimal reproduction: version: '2'

volumes: settings:

services: browser: restart: always image: bh.cr/balenalabs/browser-aarch64 privileged: true volumes:

'settings:/data' ports:
'5011' # management API (optional) web: restart: always image: nginx:1.25.2 ports:
'80'

When starting, it will output: [Logs] [2023-10-03T00:26:12.869Z] [browser] LAUNCH_URL environment variable not set. [Logs] [2023-10-03T00:26:12.871Z] [browser] Looking for local HTTP/S services. [Logs] [2023-10-03T00:26:12.876Z] [browser] No service found on port 80 [Logs] [2023-10-03T00:26:12.881Z] [browser] No service found on port 443 [Logs] [2023-10-03T00:26:12.886Z] [browser] No service found on port 8080 [Logs] [2023-10-03T00:26:12.887Z] [browser] Displaying default HTML page

If you force it to load web via the API, it will work fine: ADDRESS=sudo balena scan --json | jq -r '.[0].address' curl --data "url=web" http://$ADDRESS:5011/url This will show the "welcome to nginx" page on the device

If you tell it to re-scan via the API, it still won't find the local container. curl -X POST http://$ADDRESS:5011/scan 💩 [Logs] [2023-10-03T00:34:14.361Z] [browser] LAUNCH_URL environment variable not set. [Logs] [2023-10-03T00:34:14.363Z] [browser] Looking for local HTTP/S services. [Logs] [2023-10-03T00:34:14.369Z] [browser] No service found on port 80 [Logs] [2023-10-03T00:34:14.374Z] [browser] No service found on port 443 [Logs] [2023-10-03T00:34:14.378Z] [browser] No service found on port 8080 [Logs] [2023-10-03T00:34:14.383Z] [browser] Displaying default HTML page

but if you manually specify LAUNCH_URL to the other container... services: browser: environment: LAUNCH_URL: http://web ... it works:

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balena-io-experimental / browser

Other container web service auto detection not working #159