# Docker subfolder install not working due to Ember-CLI proxy error?
**URL:** https://meta.discourse.org/t/docker-subfolder-install-not-working-due-to-ember-cli-proxy-error/242217
**Category:** Self-hosting
**Tags:** unsupported-install, docker
**Created:** [October 18, 2022, 3:40pm UTC](https://meta.discourse.org/t/docker-subfolder-install-not-working-due-to-ember-cli-proxy-error/242217 "2022-10-18T15:40:57Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@merefield](https://meta.discourse.org/u/merefield)
#### Post date: [October 18, 2022, 3:40pm UTC](https://meta.discourse.org/t/docker-subfolder-install-not-working-due-to-ember-cli-proxy-error/242217/1 "2022-10-18T15:40:57Z")
(I’ve tagged this #unsupported-install but would appreciate guru input regardless 🙂)
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:
```plaintext
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?:
`/bootstrap.json`
giving the error:
```plaintext
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:
```plaintext
discourse-ember:
command: bin/ember-cli --port 4000 --proxy "http://0.0.0.0:4200/forum"
```
I get a Rails error:
```plaintext
Routing Error
No route matches [GET] "/forum"
```
Yet not a few lines away, it provides me with:
```plaintext
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:
```plaintext
http://0.0.0.0:4200/forum/bootstrap.json
```
Remember, in this instance, Ember is running in its own container.
---
### Author:  [@pfaffman](https://meta.discourse.org/u/pfaffman)
#### Post date: [October 18, 2022, 3:47pm UTC](https://meta.discourse.org/t/docker-subfolder-install-not-working-due-to-ember-cli-proxy-error/242217/2 "2022-10-18T15:47:19Z")
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?)
---
### Author:  [@merefield](https://meta.discourse.org/u/merefield)
#### Post date: [October 18, 2022, 3:48pm UTC](https://meta.discourse.org/t/docker-subfolder-install-not-working-due-to-ember-cli-proxy-error/242217/3 "2022-10-18T15:48:04Z")
Yes, these container definitions are in a docker-compose.
There are no environment settings in the ember-cli container currently.
---
### Author:  [@pfaffman](https://meta.discourse.org/u/pfaffman)
#### Post date: [October 18, 2022, 3:52pm UTC](https://meta.discourse.org/t/docker-subfolder-install-not-working-due-to-ember-cli-proxy-error/242217/4 "2022-10-18T15:52:22Z")
You’re building the container with launcher with the stuff from [Serve Discourse from a subfolder (path prefix) instead of a subdomain](https://meta.discourse.org/t/serve-discourse-from-a-subfolder-path-prefix-instead-of-a-subdomain/30507) 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:
```plaintext
--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('')}}"
```
---
### Author:  [@merefield](https://meta.discourse.org/u/merefield)
#### Post date: [October 18, 2022, 3:55pm UTC](https://meta.discourse.org/t/docker-subfolder-install-not-working-due-to-ember-cli-proxy-error/242217/5 "2022-10-18T15:55:20Z")
> [@pfaffman](#):
>
> You’re building the container with launcher
No, I’m just using a Discourse Docker Image (version 2.8.9).
(actually the image is hosted locally, but its pretty much:)
```plaintext
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”
ports:
- 4200:4200
```
```plaintext
discourse-ember:
command: bin/ember-cli --port 4000 --proxy "http://0.0.0.0:4200"
image: discourse:v2.8.9
ports:
- 4000:4000
```
---
### Author:  [@pfaffman](https://meta.discourse.org/u/pfaffman)
#### Post date: [October 18, 2022, 4:24pm UTC](https://meta.discourse.org/t/docker-subfolder-install-not-working-due-to-ember-cli-proxy-error/242217/6 "2022-10-18T16:24:45Z")
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.
---
### Author:  [@merefield](https://meta.discourse.org/u/merefield)
#### Post date: [October 18, 2022, 9:42pm UTC](https://meta.discourse.org/t/docker-subfolder-install-not-working-due-to-ember-cli-proxy-error/242217/7 "2022-10-18T21:42:49Z")
Solved.
My bad for not adding this to the Ember CLI container (it was already on the Rails container):
```plaintext
DISCOURSE_RELATIVE_URL_ROOT: "/board"
```
Ooops 😅
FYI the key file in source is I believe this:
>
---
### Author:  [@system](https://meta.discourse.org/u/system)
#### Post date: [November 17, 2022, 9:42pm UTC](https://meta.discourse.org/t/docker-subfolder-install-not-working-due-to-ember-cli-proxy-error/242217/8 "2022-11-17T21:42:54Z")
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