OpenStack known issues

This section lists the OpenStack known issues with workarounds for the Mirantis OpenStack for Kubernetes release 23.2.

[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:

spec:
  services:
    networking:
      neutron:
        values:
          conf:
            bagpipe_bgp:
              dataplane_driver_ipvpn:
                mpls_over_gre: "False"
                vxlan_encap: "True"

[31186] The mariadb-server Pod does not recover after node reboot

After a node reboot, the mariadb-server Pod does not recover showing the Corrupt buffer header error in the logs of the MariaDB replicas. For example:

mariadb 2023-03-18 10:36:37,929 - OpenStack-Helm Mariadb - INFO - 2023-03-18 10:36:37 1 [ERROR] WSREP: Corrupt buffer header: addr: 0x7f7e7ffff518, seqno: 3185219421952815104, size: 859136813, ctx: 0x55eaf74eb298, flags: 11575. store: 49, type: 49

Workaround:

  1. Create a backup of the /var/lib/mysql directory on the mariadb-server Pod.

  2. Verify that other replicas are up and ready

  3. Remove content of the /var/lib/mysql directory on the mariadb-server Pod:

    kubectl -n openstack exec -ti mariadb-server-0 -c mariadb -- rm -rf /var/lib/mysql
    
  4. Remove the mariadb-server Pod:

    kubectl -n openstack delete pod mariadb-server-0
    

After Kubernetes restarts the Pod, the Pod clones the database in 1-2 minutes and restores the quorum.

[34897] Machines are not available after Victoria to Wallaby update

Fixed in 23.3

After update of OpenStack from Victoria to Wallaby, the machines from nodes with DPDK become unavailable.

Workaround:

  1. Search for the nodes with the OVS ports:

    for i in $(kubectl -n openstack get pods |grep openvswitch-vswitchd | awk '{print $1}'); do kubectl -n openstack exec -it -c openvswitch-vswitchd $i -- ovs-vsctl show |grep -q "tag: 4095" && echo $i; done
    
  2. Restart the neutron-ovs-agent agent on the affected nodes.