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Selfhosted
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It may be better now but I’ve always had problems with Docker in LXC containers; I think this has to do with my storage backend (Ceph) and the fact that LXC is a pain to use with network mounts (NFS or SMB); I’ve had to use bind mounts and run privileged LXCs for anything I needed external storage for.
Proxmox is about managing VMs and LXCs. I’d just create a VM and do all your docker in there. Perhaps make a second VM so you can shuffle containers around while doing upgrades.
If you plan to have your whole setup be exclusively Docker and you have no need for VMs or LXCs, then Proxmox might be a bunch of overhead you don’t need.
I use the LXCs for simple stuff that does a bare-metal type install within them, and I use the VMs for critical services like OPNSense firewall/routers. I also have a Proxmox cluster across three machines so I can live-migrate VMs during upgrades and prevent almost any downtime. For that use case it’s rock solid. It’s a great product and it offers a lot.
If you just need a single machine and only Docker, it’s probably overkill.