Docker subfolder install not working due to Ember-CLI proxy error?

Installation
,
1

(I’ve tagged this unsupported-install but would appreciate guru input regardless :slight_smile:)

Guys, I’m trying to run a basic Discourse image in a simple-ish(?) multi docker container setup via Docker Compose.

Here’s the basics:

  • The forum is living in a subfolder, lets call it /board, so (https://blah.com/board)
  • nginx is passing calls to /board:443 to localhost:4000.
  • Discourse rails was running on port 4000 (because 3000 is being used by something else)
  • included in the Rails ENVs is a crucial setting which sets this up to work:
    DISCOURSE_RELATIVE_URL_ROOT: “/board”

Now I’ve updated the version of Discourse (pre Ember-CLI) and things are no longer working.

So, of course, I add a container for Ember-CLI which runs:

discourse-ember:
    command: bin/ember-cli --port 4000 --proxy "http://localhost:4200"

So Ember is now handling the calls coming in on 4000 in the first instance.

I move Discourse rails container to port 4200 and kick things off.

First the good news:

  • curling the dev site works!

Now the bad news:

  • Doesn’t work in browser, why?:

    because it’s apparently trying to reach Discourse but requesting:

/bootstrap.json

giving the error:

Discourse Ember CLI Proxy Error
Error: Could not get http://0.0.0.0:4200/bootstrap.json

FetchError: invalid json response body at http://0.0.0.0:4200/bootstrap.json?for_url=%2Fboard reason: Unexpected token N in JSON at position 0

instead of

/board/bootstrap.json (which returns data).

If instead I use this config:

  discourse-ember:
    command: bin/ember-cli --port 4000 --proxy "http://0.0.0.0:4200/forum"

I get a Rails error:

Routing Error
No route matches [GET] "/forum"

Yet not a few lines away, it provides me with:

bootstrap_path	GET	/bootstrap(.:format)	
bootstrap#index {:format=>/(json|html|\*\/\*)/}

Which is exactly the path I was trying to reach?

How do I make Ember smart enough to proxy to the subfolder when it’s trying to get the bootstrap info?, ie:

http://0.0.0.0:4200/forum/bootstrap.json

Remember, in this instance, Ember is running in its own container.

1 Like
2

How are you building the container? You’re launching that container from docker-compose?

There was . . . uh, some env setting . . . that could be used to try to keep ember-cli from working; did you remove that? (I think it’s ignored now anyway?)

3

Yes, these container definitions are in a docker-compose.

There are no environment settings in the ember-cli container currently.

4

You’re building the container with launcher with the stuff from Serve Discourse from a subfolder (path prefix) instead of a subdomain before you get docker-compose to launch it?

What’s the proxy? Maybe just launch discourse with launcher and use docker-args to set other stuff that is needed? For traefik, I do something like this:

        --docker-args "-l traefik.frontend.rule=Host:{{discourse_hostname}};PathPrefix:/{{discourse_subfolder}} \
        -l traefik.frontend.entryPoints=https \
        -l traefik.backend={{discourse_shortname}} \
        -l traefik.port=80 \
        {{ docker_extra_args | default('')}}"
1 Like
5

No, I’m just using a Discourse Docker Image (version 2.8.9).

(actually the image is hosted locally, but its pretty much:)

  discourse:
    command: bin/rails s -b 0.0.0.0 -p 4200
    image: discourse:v2.8.9
    environment:
      DISCOURSE_PORT: 4200
      DISCOURSE_RELATIVE_URL_ROOT: “/board”
     <SNIP>
    ports:
      - 4200:4200

  discourse-ember:
    command: bin/ember-cli --port 4000 --proxy "http://0.0.0.0:4200"
    image: discourse:v2.8.9
    ports:
      - 4000:4000
6

Hmm. In that case I can’t explain how it ever worked. I think you need to build an image with launcher that adds the stuff to support subfolder installs.

7

Solved.

My bad for not adding this to the Ember CLI container (it was already on the Rails container):

DISCOURSE_RELATIVE_URL_ROOT: "/board"

Ooops :sweat_smile:

FYI the key file in source is I believe this:

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8

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