[pve-devel] [PATCH-SERIES v3 container/qemu-server] fix #3421: allow custom storage plugins to support rootfs

[Fabian Ebner]

There's an edge case with 'restart' migration for containers that breaks 
because of the new content type on startup checks:
If there is an already running container with a volume on storage A, and 
now storage A is reconfigured to not support 'rootdir' anymore, then 
migration itself does work, but there'll be an error on startup on the 
remote node. It would be nicer if the error would appear at the start of 
the migration already.

For VMs (with 'online' migration) the situation is not as bad, because 
the remote start happens earlier, so the VM will still be running on the 
original node after the error.

And one can offline migrate such unstartable guests around ;)

IMHO, if we add the checks for content type on startup, it's all the 
more reason to have content type checks for migration as well. For VM 
migration with the targetstorage option, there already are such checks.


It's a tangential problem of course, your patches look fine to me:

Reviewed-by: Fabian Ebner <f.ebner at proxmox.com>

Am 27.05.21 um 14:23 schrieb Lorenz Stechauner:
> changes to v2:
> * typo s/supoort/support/
> * more detailed error messages
> * implemented check also for vms
> 
> pve-container:
> 
> Lorenz Stechauner (1):
>    fix #3421: allow custom storage plugins to support rootfs
> 
>   src/PVE/LXC.pm | 30 ++++++++++++------------------
>   1 file changed, 12 insertions(+), 18 deletions(-)
> 
> 
> qemu-server:
> 
> Lorenz Stechauner (1):
>    vm_start: check if storages of volumes support content images
> 
>   PVE/QemuServer.pm | 7 +++++++
>   1 file changed, 7 insertions(+)
>