How to try out nested-pods locally (VLAN + trunk)¶

Following are the instructions for an all-in-one setup where Kubernetes will also be running inside the same Nova VM in which Kuryr-controller and Kuryr-cni will be running. 4GB memory and 2 vCPUs, is the minimum resource requirement for the VM:

1. To install OpenStack services run devstack with devstack/local.conf.pod-in-vm.undercloud.sample. Ensure that “trunk” service plugin is enabled in /etc/neutron/neutron.conf:

   [DEFAULT]
   service_plugins = neutron.services.l3_router.l3_router_plugin.L3RouterPlugin,neutron.services.trunk.plugin.TrunkPlugin
   

2. Launch a VM with Neutron trunk port.. The next steps can be followed: Boot VM with a Trunk Port.

3. Inside VM, install and setup Kubernetes along with Kuryr using devstack:

   • Since undercloud Neutron will be used by pods, Neutron services should be disabled in localrc.

   • Run devstack with devstack/local.conf.pod-in-vm.overcloud.sample. but first fill in the needed information:

     • Point to the undercloud deployment by setting:

       SERVICE_HOST=UNDERCLOUD_CONTROLLER_IP
       

     • Fill in the subnetpool id of the undercloud deployment, as well as the router where the new pod and service networks need to be connected:

       KURYR_NEUTRON_DEFAULT_SUBNETPOOL_ID=UNDERCLOUD_SUBNETPOOL_V4_ID
       KURYR_NEUTRON_DEFAULT_ROUTER=router1
       

     • Ensure the nested-vlan driver is going to be set by setting:

       KURYR_POD_VIF_DRIVER=nested-vlan
       

     • Optionally, the ports pool funcionality can be enabled by following: How to enable ports pool with devstack.

     • [OPTIONAL] If you want to enable the subport pools driver and the VIF Pool Manager you need to include:

       KURYR_VIF_POOL_MANAGER=True
       

4. Once devstack is done and all services are up inside VM. Next steps are to configure the missing information at /etc/kuryr/kuryr.conf:

   • Configure worker VMs subnet:

     [pod_vif_nested]
     worker_nodes_subnet = <UNDERCLOUD_SUBNET_WORKER_NODES_UUID>
     

   • Configure binding section:

     [binding]
     driver = kuryr.lib.binding.drivers.vlan
     link_iface = <VM interface name eg. eth0>
     

   • Restart kuryr-k8s-controller:

     sudo systemctl restart devstack@kuryr-kubernetes.service
     

Now launch pods using kubectl, Undercloud Neutron will serve the networking.