I’ve a Discourse server for which ./launcher rebuild app results in: FAILED -------------------- Pups::ExecError: grep -q 'outlets/before-server' /etc/nginx/conf.d/discourse.conf || ( >&2 echo 'The "before-server" Nginx outlet is missing. This version of discourse_docker is not compatible with the …

I’ve tracked down the issue — it was caused by the discourse-images-guardian plugin from @mbcahyono which needed the nginx.sample.conf file updating, I have done this and created a pull request to fix it.

I have tried downgrading docker_manager code base to the version before the last commit on Jul 10, 2025 : su - discourse cd /var/discourse/ ./launcher enter app su - discourse cd /var/www/discourse/plugins/docker_manager git checkout d91016c exit exit ./launcher rebuild app But that didn’t make a d…

I just did a rebuild without any trouble. Are there other errors above what you included? What does free -h report?

It’s not a disk space issue: df -h Filesystem Size Used Avail Use% Mounted on tmpfs 588M 1.1M 587M 1% /run /dev/sda2 118G 79G 34G 71% / tmpfs 2.9G 0 2.9G 0% /dev/shm tmpfs 5.0M 0 5.0M 0% /run/lock tmpfs 588M 12K 588M 1%…

Following is what the Nginx config (/etc/nginx/conf.d/discourse.conf) in the container contains, there was no reference to outlets/before-server: # Additional MIME types that you'd like nginx to handle go in here types { text/csv csv; } upstream discourse { server 127.0.0.1:3000; } proxy_cach…

Thanks @mbcahyono I did some basic testing and it seems to work…! However this is this issue — overriding the site image URLs doesn’t work any more, any ideas how to fix this?

Upgrading failing with: The "before-server" Nginx outlet is missing... discourse_docker is not compatible with the chosen Discourse version

Product Support

mbcahyono (Muhlis Cahyono) July 12, 2025, 9:21am 7

Merged! Thanks for the PR.

I didn’t get a chance to test it, so I’m trusting you on this one

Topic		Replies	Views
Discourse has stopped opening Self-hosting	36	6332	August 8, 2016
Cannot rebuild app after recent upgrade 05/07/2025 Bug fixed	10	552	May 9, 2025
Discourse not serving pages Self-hosting	25	3410	August 4, 2020
Upgrading old version 2.8.5 issues Self-hosting	26	674	December 15, 2025
502 Bad Gateway - nginx/1.14.0 (Ubuntu): Unable to find image locally + Error response from daemon Self-hosting	9	9457	November 18, 2019

Upgrading failing with: The "before-server" Nginx outlet is missing... discourse_docker is not compatible with the chosen Discourse version

Related topics