network-dra

PoCs for calling CNI using DRA

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Ecosystems: Go

Network DRA

Example of a DRA integration with an NRI Plugin for calling CNIs on pod creation.

This is a PoC (Proof Of Concept) about resource configuration. A Kubernetes fork implementing KEP-4817 is used (github.com/LionelJouin/kubernetes/tree/KEP-4817).

PoCs:

Other PoCs:

Build

Generate Code (Proto, API, ...)

make generate

build/push (default registry: localhost:5000/network-dra)

make REGISTRY=localhost:5000/network-dra

Clone Kubernetes

git clone [email protected]:kubernetes/kubernetes.git
cd kubernetes
git remote add LionelJouin [email protected]:LionelJouin/kubernetes.git
git fetch LionelJouin
git checkout LionelJouin/KEP-4817

Build Kubernetes

kind build node-image . --image kindest/node:kep-4817

Demo

Create Kind Cluster

kind create cluster --config examples/kind.yaml

Load Images in Kind

kind load docker-image localhost:5000/network-dra/network-nri-plugin:latest

Install CNI Plugins

kubectl apply -f https://raw.githubusercontent.com/k8snetworkplumbingwg/multus-cni/master/e2e/templates/cni-install.yml.j2

Install DRA Plugin

helm install network-dra deployments/network-DRA --set registry=localhost:5000/network-dra

Demo

kubectl apply -f examples/demo-a.yaml
  • Demo A
    • Single Pod with a single resource claim.
    • The pod will receive the interface described in the macvlan-eth0-attachment resource claim parameter.

Flow

  1. Kubelet calls the NodePrepareResources via the DRA API.
    • The NRI-Plugin is also the DRA-Driver, so it gets the call.
  2. The full ResourceClaims are retrieved from the Kubernetes API.
    • The ResourceClaims are stored for the pod in the reservedFor field (Pod requesting this claim stored in the ResourceClaim allocation status).
  3. Kubelet creates the pod.
    • Kubelet calls RunPodSanbox to the Container runtime.
  4. At the end of RunPodSanbox, the container runtime calls RunPodSanbox(nri.PodSandbox) for each NRI Plugin.
    • The pod Name, pod Namespace, network namespace are retrieved.
  5. The NRI plugin retrieves the previously stored ResourceClaims for the pod passed to RunPodSanbox.
    • CNI Add is called based on the CNI config stored in the ResourceClaims.
  6. The Kubernetes API is used to update the ResourceClaims Devices Status with the CNI result.

Result

Object applied: ./examples/demo-a.yaml

Final ResourceClaim object:

apiVersion: resource.k8s.io/v1alpha3
kind: ResourceClaim
metadata:
  name: macvlan-eth0-attachment
spec:
  devices:
    config:
    - opaque:
        driver: poc.dra.networking
        parameters:
          config:
            cniVersion: 1.0.0
            name: macvlan-eth0
            plugins:
            - ipam:
                ranges:
                - - subnet: 10.10.1.0/24
                type: host-local
              master: eth0
              mode: bridge
              type: macvlan
          interface: net1
      requests:
      - macvlan-eth0
    requests:
    - allocationMode: ExactCount
      count: 1
      deviceClassName: network-interface
      name: macvlan-eth0
status:
  allocation:
    devices:
      config:
      - opaque:
          driver: poc.dra.networking
          parameters:
            config:
              cniVersion: 1.0.0
              name: macvlan-eth0
              plugins:
              - ipam:
                  ranges:
                  - - subnet: 10.10.1.0/24
                  type: host-local
                master: eth0
                mode: bridge
                type: macvlan
            interface: net1
        requests:
        - macvlan-eth0
        source: FromClaim
      results:
      - device: cni
        driver: poc.dra.networking
        pool: kind-worker
        request: macvlan-eth0
    nodeSelector:
      nodeSelectorTerms:
      - matchFields:
        - key: metadata.name
          operator: In
          values:
          - kind-worker
  devices:
  - conditions: null
    data:
    - cniVersion: 1.0.0
      interfaces:
      - mac: b2:af:6a:f9:12:3b
        name: net1
        sandbox: /var/run/netns/cni-d36910c7-c9a4-78f6-abad-26e9a8142a04
      ips:
      - address: 10.10.1.2/24
        gateway: 10.10.1.1
        interface: 0
    device: cni
    driver: poc.dra.networking
    networkData:
      addresses:
      - cidr: 10.10.1.2/24
      hwAddress: b2:af:6a:f9:12:3b
      interfaceName: net1
    pool: kind-worker
  reservedFor:
  - name: demo-a
    resource: pods
    uid: 680f0a77-8d0b-4e21-8599-62581e335ed6

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