I use the bellow args to create the openstack instance:

server_args = {
    "name":server_name, # its 123456
    "image_id":image_id,
    "flavor_id":flavor_id,
    "networks":[{"uuid":network.id}],
    "admin_password": admin_password,  # there is 123456 too
}

# create server
try:
    server = user_conn.conn.compute.create_server(**server_args)
    server = user_conn.conn.compute.wait_for_server(server)
except Exception as e:
    raise e

But after I create it, I can not use the root/admin_password to login the instance. I am not sure whether the issue is, but I think my params is correct.

EDIT -1

And in the QEMU, there is another issue sometimes, but I am not sure whether this is related:

cloud init util.py getting data from <class 'cloudinit.source.DataSourceOpenStack.DataSourceOpenStack'> failed ...