OpenStack known issues

This section lists the OpenStack known issues with workarounds for the Mirantis OpenStack for Kubernetes release 22.4.

[25594] Security groups shared through RBAC cannot be used to create instances

It is not possible to create an instance that uses a security group shared through role-based access control (RBAC) with only specifying the network ID when calling Nova. In such case, before creating a port in the given network, Nova verifies if the given security group exists in Neutron. However, Nova asks only for the security groups filtered by project_id. Therefore, it will not get the shared security group back from the Neutron API. For details, see the OpenStack known issue #1942615.


  1. Create a port in Neutron:

    openstack port create --network <NET> --security-group <SG_ID> shared-sg-port
  2. Pass the created port to Nova:

    openstack server create --image <IMAGE> --flavor <FLAVOR> --port shared-sg-port vm-with-shared-sg


If security groups shared through RBAC are used, apply them to ports only, not to instances directly.

[25124] MPLSoGRE encapsulation has limited throughput

Multiprotocol Label Switching over Generic Routing Encapsulation (MPLSoGRE) provides limited throughput while sending data between VMs up to 38 Mbps, as per Mirantis tests.

As a workaround, switch the encapsulation type to VXLAN in the OpenStackDeployment custom resource:

                mpls_over_gre: "False"
                vxlan_encap: "True"