openstack - Performance impact for attaching Security Group with more number of rules

Question

I have an OpenStack Environment with 5000+ VMs running currently. I want to apply some common Security Group to all my running VMs.

• Common Security Group (SEC_GRP_COMMON) has around 700 rules.
• This Security Group (SEC_GRP_COMMON) has been shared to all the OpenStack Projects using Role-Based Access Control (RBAC).
• Wanted to apply this Security Group (SEC_GRP_COMMON) to all the running VMs in the Cloud

Question 1: With the above scenario, what will happen if I attach this Security Group(with 700+ rules) to all the 5000+ VMs? Will there be any performance issue/impact for the same (CPU utilization, Memory etc. in the Compute Server or Performance issues in application running in the VMs)

Question 2: Is there any recommendations or benchmark data for maximum number of rules in the Security Group in OpenStack cloud?

Answer 1

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