Using ExApps on the same docker host by multiple NC instances

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The Basics

  • Nextcloud Server version (e.g., 29.x.x):
    • e.g. 30.0.5
  • Operating system and version (e.g., Ubuntu 24.04):
    • Archlinux
  • Web server and version (e.g, Apache 2.4.25):
    • Apache under docker
  • Reverse proxy and version _(e.g. nginx 1.27.2)
    • Apache
  • PHP version (e.g, 8.3):
    • 8.2.27
  • Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.)
    • Docker community image
  • Are you using CloudfIare, mod_security, or similar? (Yes / No)
    • No

Summary of the issue you are facing:

I am running multiple (small) NV instances on the same docker host. I enabled and set up the ApiApp to run ExApps and played a bit with some. I use the docker proxy service to connect to docker with reduced permissions of the NC containers.

I have seen that the ExApps are starting in the docker global namespace, e.g. nc_app_talk_bot_ai or nc_app_translate2.

I fear that if multiple NC instances are running ApiApp to call ExApps, this might cause a name clash. Ideally, I would expect to be able to define a namespace (aka a prefix like nc_app_) per instance in the settings.

However, I am unsure if this will even be a problem: Are the version of the docker container running somehow tailored down to the NC PHP part or are these unrelated? Can I reuse the containers from the different NC instances?

Steps to replicate it (hint: details matter!):

  1. Install 2 instances A and B on the same docker host
  2. Install/enable ApiApp on both and install DSP allowing to connect the host docker daemon
  3. Install an ExApp on A (e.g. translate2)

How will this affect instance B?
Can instance B use translate2 ExApp as well?
Can I install the ExApp in B if not?
Might there be a crash on either instance if versions are not converging?

Can the DSP container be shared?

2

I’m currently doing the first steps with ExApps and I’ve more or less the same question.

I’ve multiple NC instances on separate VMs and setup a docker proxy service on another additional VM. Connecting one NC instance works so far. But I’m alo not sure whether I can connect further NC instances to that docker proxy.
It could also get more complicated if different settings are chosen (like with or without gpu support).