Set PBS_QEMU_DEBUG=1 on a command that starts a VM and then connect to
the debug root shell via:
minicom -D \unix#/run/proxmox-backup/file-restore-serial-10.sock
or similar.
Note that this requires 'proxmox-backup-restore-image-debug' to work,
the postinst script is updated to also generate the corresponding image.
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
A PCI bus can only support up to 32 devices, so excluding built-in
devices that left us with a maximum of about 25 drives. By adding a new
PCI bridge every 32 devices (starting at bridge ID 2 to avoid conflicts
with automatic bridges), we can theoretically support up to 8096 drives.
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
The guest kernel requires more memory depending on how many disks are
attached. 256 seems to be enough for basically any reasonable and
unreasonable amount of disks though.
For debug instance, make it 1G, as these are never started automatically
anyway, and need at least 512MB since the initramfs (especially when
including a debug build of the daemon) is substantially bigger.
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
Helps to clean up a VM that has crashed, is not responding to vsock API
calls, but still has a running QEMU instance.
We always check the process commandline to ensure we don't kill a random
process that took over the PID.
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
Drive serials have a character limit of 20, longer names like
"drive-virtio0.img.fidx" or "drive-efidisk0.img.fidx" would get cut off.
Fix this by removing the suffix, it is not necessary to uniquely
identify an image.
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
With the vsock-pkt-buffer fix in proxmox-backup-restore-image, we can
use way less memory for the VM without risking any crashes. 128 MiB
seems to be the lowest it will go and still be fully reliable.
While at it, add the "panic=1" argument to the kernel command line, so
in case the kernel *does* run out of memory, it will at least restart
automatically.
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
Includes methods to start, stop and list QEMU file-restore VMs, as well
as CLI commands do the latter two (start is implicit).
The implementation is abstracted behind the concept of a
"BlockRestoreDriver", so other methods can be implemented later (e.g.
mapping directly to loop devices on the host, using other hypervisors
then QEMU, etc...).
Starting VMs is currently unused but will be needed for further changes.
The design for the QEMU driver uses a locked 'map' file
(/run/proxmox-backup/$UID/restore-vm-map.json) containing a JSON
encoding of currently running VMs. VMs are addressed by a 'name', which
is a systemd-unit encoded combination of repository and snapshot string,
thus uniquely identifying it.
Note that currently you need to run proxmox-file-restore as root to use
this method of restoring.
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
Stefan Reiter