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openstack security group issue

in our Openstack environment, we create VMs by use of heat stack/template. In the heat stack, we normally associate a basic security group with the VMs. Later we add another 1 or a few of security groups to the VM via the CLI "nova add-secgroup".

Recently, we found the manually added the security group disappeared/removed from the VMs.

MY question is: does Heat Stack remove the manually added security group due to some kind of compliance check (the manually added security groups are not in the same heat template)

Our openstack version is Kilo.

Anybody see the similar issue? Or any clue what the issue is?

Your help is highly appreciated!