Hm, Docker isn’t very good at this. It’s good at runnign one process or a few related processes with a smaller init system like S6, but not good at running a full system with its own init and system handlers.

Lots of stuff will break, because it’s expected that a lot of system-level initialization will be taking place. Docker is too opinionated when it comes to this, because it expects to be running on a system that has already been initialized.

Look to LXC or LXD. It’s more appropriate for this, and while it’s a container system it’s more like virtualization than application containerization. It’s also designed to be mutable, which is the main limitation you’re running up against.

NextCloud, Plex, Minio (s3, backed by Linstor), NFS CSI driver, Linstor (DRBD), Pacemaker (HA NFS server, backed by Linstor).

Linstor controls the block layer and transport, as well as providing a FS-agnotic replication layer. NFS is used for HDD-backed file storage, and is extremely simple and reliable due to the stateful cluster that controls it. S3 is used by various applications, as it’s easy as hell to implement clients for. S3 has an SSD and HDD tier, as well as an AWS-replicated tier. S3 is where my backups go (Velero).

You can find 12-bay raspberry PI blade chassis that fit in 2U on thingiverse. I had a friend print me one. It’s been wonderful. You can buy them too, of course.

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