Multihome support for csi Nodes

[EHerzog76]

Network Multihome support for csi Nodes

Please add support for multihome configurations in combination with MULTUS.

Why is this usefull ?

We can seperate frontend traffic from storage traffic and can assign dedicated network cards/bond´s.

How can it be implemented

In the TridentOrchestrator add some config parameters like this:

apiVersion: trident.netapp.io/v1
kind: TridentOrchestrator
spec:
  hostNetworkNode: false
  NodeStorageNetwork: <namespace>/<NetworkAttachementDefinition-Name>

In the source code e.g. of : trident/cli/k8s_client/yaml_factory.go

const daemonSet120YAMLTemplateLinux = `---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: {DAEMONSET_NAME}
  {LABELS}
  {OWNER_REF}
spec:
  selector:
    matchLabels:
      app: {LABEL_APP}
  template:
    metadata:
      labels:
        app: {LABEL_APP}
      annotations:
        openshift.io/required-scc: {SERVICE_ACCOUNT}
        k8s.v1.cni.cncf.io/networks: {NodeStorageNetwork}  # When {NodeStorageNetwork} is defined
    spec:
      serviceAccount: {SERVICE_ACCOUNT}
      hostNetwork: false            # When {NodeStorageNetwork} is defined
      hostIPC: true
      hostPID: true

[EHerzog76]

Multus NetworkAttachementDefinition (NAD) exampel

This is a exampel of a MULTUS NAD definition,

which will be assigned as a second NIC in the POD for the storage network:

---
apiVersion: k8s.cni.cncf.io/v1
kind: NetworkAttachmentDefinition
metadata:
  name: storage-network
  namespace: trident
spec:
  config: '{
    "cniVersion": "0.4.0",
    "type": "macvlan",                # This defines which CNI plugin to use
    "master": "bond1.20",         # Which interface to use on the node
    "mode": "bridge",                 # Mode of operation (macvlan in this case)
    "ipam": {                   # IP Address Management (IPAM) settings you can also use static and assign IP manually 
      "type": "whereabouts",
      "range": "172.20.0.0/24",
      "exclude": [
        "172.20.0.0/30"
      ]
    }
  }'