docker-compose up -d fails with permission denied error

[GamerBene19]

First of all: I don't know if this is the right repo for this issue, if I should post it somewhere else just tell me.
Posted the same issue here

Describe the issue you are having

Starting the docker container(s) via "docker-compose up -d" fails (error message below). As far as I can tell its because something related to access rights.

How are you running the container(s)

Virtualized in an LXC via Proxmox with current docker/docker-compose versions (aka fresh install as of today).
Using this .env file and starting with "docker-compose up -d".
Commands are executed as root (as it is a LXC and that's its only purpose)

DNS Configuration

Irrelevant/Not the issue here.

Output of container(s)

See this pastebin

I can provide further information/logs as needed. Just tell me.

TIA for any help.

[GamerBene19]

The issue is solved. The problem was that I had to enable keyctl and nesting on the relevant linux containers.