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Node Subnet

According to the Kubernetes network specifications, a node can directly communicate with all pods. To achieve this goal, Kube-OVN creates a join subnet and creates a virtual NIC ovn0 on each node to connect to the join subnet. Hosts can communicate with pods through the subnet.

You can change the configuration of the node subnet during the installation. For details, see Configuring the Built-in Subnets.

  • Run the following command to view the node subnet:
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    kubectl get subnet join -o yaml

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    apiVersion: kubeovn.io/v1
kind: Subnet
metadata:
  creationTimestamp: "2020-06-28T06:42:32Z"
  finalizers:
  - kube-ovn-controller
  generation: 2
  name: join
  resourceVersion: "749434"
  selfLink: /apis/kubeovn.io/v1/subnets/join
  uid: 3179fdc6-56a9-4211-a4c2-d922f4463adb
spec:
  cidrBlock: 100.64.0.0/16
  default: false
  excludeIps:
  - 100.64.0.1
  gateway: 100.64.0.1
  gatewayNode: ""
  gatewayType: distributed
  natOutgoing: false
  private: false
  protocol: IPv4
  provider: ovn
  underlayGateway: false
status:
  activateGateway: ""
  availableIPs: 65530
  conditions:
  - lastTransitionTime: "2020-06-28T06:42:33Z"
    lastUpdateTime: "2020-06-28T06:42:33Z"
    reason: ResetLogicalSwitchAclSuccess
    status: "True"
    type: Validated
  - lastTransitionTime: "2020-06-28T06:42:33Z"
    lastUpdateTime: "2020-06-28T06:42:33Z"
    reason: ResetLogicalSwitchAclSuccess
    status: "True"
    type: Ready
  - lastTransitionTime: "2020-06-28T06:42:33Z"
    lastUpdateTime: "2020-06-28T06:42:33Z"
    message: Not Observed
    reason: Init
    status: Unknown
    type: Error
  usingIPs: 3
  • Run the following command on each node to view the ovn0 NIC:
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    ifconfig ovn0

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    ovn0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1400
        inet 100.64.0.2  netmask 255.255.0.0  broadcast 100.64.255.255
        inet6 fe80::200:ff:fec6:936d  prefixlen 64  scopeid 0x20<link>
        ether 00:00:00:c6:93:6d  txqueuelen 1000  (Ethernet)
        RX packets 5673864  bytes 530785977 (506.1 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 5243874  bytes 8069050878 (7.5 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
Parent topic: Subnet Management