My images importing need large disk size and my root disk size is not so large.
I want to store them in ceph instead of local.
What should i do?
You can create a custom volume on a ceph pool and then set
lxc set storage.images_volume = <pool>/<volume name> to instruct LXD to use it for downloaded images.
Thank you @tomp
My custom images will store in it too?
Yep all images