nydus

www.google.com/search?q=lxc+copy+on+write : lxc-copy supports btrfs, zfs, lvm, overlayfs lxc/incus: "Add OCI image support" https://github.com/lxc/incus/issues/908 opencontainers/image-spec; OCI Image spec: https://github.com/opencontainers/image-spec opencontainers/distribution-spec; OCI Image distribution spec: https://github.com/opencontainers/distribution-spec But then in the opencontainers/runtime-spec//config.md OCI runtime spec TODO bundle config.json there is an example of a config.json https://github.com/opencontainers/runtime-spec/blob/main/con... The LXC approach is to run systemd in the container. The quadlet approach is to not run systemd /sbin/init in the container; instead create .container files in /etc/containers/systemd/ (rootful) or ~/.config/containers/systemd/*.container (for rootless) so that the host systemd manages and logs the container processes. Then realized you said QEMU not LXC. LXD: https://canonical.com/lxd : > LXD provides both [QEMU,] KVM-based VMs and system containers based on LXC – that can run a full Linux OS – in a single open source virtualisation platform. LXD has numerous built-in management features, including live migration, snapshots, resource restrictions, projects and profiles, and governs the interaction with various storage and networking options. From https://documentation.ubuntu.com/lxd/latest/reference/storag... : > LXD supports the following storage drivers for storing images, instances and custom volumes: > Btrfs, CephFS, Ceph Object, Ceph RBD, Dell PowerFlex, Pure Storage, HPE Alletra, Directory, LVM, ZFS You can run Podman or Docker within an LXD host; with or without a backing storage pool. FWIU it's possible for containers in an LXD VM to use BTRFS, ZFS, or KVM storage drivers to create e.g. BTRFS subvolumes instead of running overlayfs within the VM by editing storage.conf.