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user-guide-state-reporting.md

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Tutorial: Reporting State

In this example, we will use kubernetes-nmstate to report state of network interfaces on our cluster nodes.

Requirements

Before we start, please make sure that you have your Kubernetes/OpenShift cluster ready with OVS. In order to do that, you can follow guides of deployment on local cluster or your arbitrary cluster.

Periodically report state from all nodes

The operator will periodically update the reported state of node interfaces.

Read NodeNetworkStates from all nodes:

kubectl get nodenetworkstates -o yaml

Or from a specific node:

kubectl get nodenetworkstate <node-name> -o yaml

The output of such command may look like this:

apiVersion: nmstate.io/v1alpha1
kind: NodeNetworkState
metadata:
  creationTimestamp: "2019-06-24T07:48:25Z"
  generation: 1
  name: node01
  resourceVersion: "629"
  selfLink: /apis/nmstate.io/v1alpha1/nodenetworkstates/node01
  uid: 7298d496-9654-11e9-ba95-525500d15501
spec:
  managed: false
  nodeName: node01
status:
  currentState:
    dns-resolver:
      config:
        search: []
        server: []
      running:
        search: []
        server:
        - 192.168.66.2
    interfaces:
    - bridge:
        options:
          group-forward-mask: 0
          mac-ageing-time: 300
          multicast-snooping: true
          stp:
            enabled: false
            forward-delay: 15
            hello-time: 2
            max-age: 20
            priority: 32768
        port: []
      ipv4:
        address:
        - ip: 10.244.0.1
          prefix-length: 24
        dhcp: false
        enabled: true
      ipv6:
        address:
        - ip: fe80::482b:43ff:fe71:7b87
          prefix-length: 64
        autoconf: false
        dhcp: false
        enabled: true
      mac-address: 0A:58:0A:F4:00:01
      mtu: 1450
      name: cni0
      state: up
      type: linux-bridge
    - bridge:
        options:
          group-forward-mask: 0
          mac-ageing-time: 300
          multicast-snooping: true
          stp:
            enabled: false
            forward-delay: 15
            hello-time: 2
            max-age: 20
            priority: 32768
        port: []
      ipv4:
        address:
        - ip: 172.17.0.1
          prefix-length: 16
        dhcp: false
        enabled: true
      ipv6:
        autoconf: false
        dhcp: false
        enabled: false
      mac-address: 02:42:9C:5D:73:B1
      mtu: 1500
      name: docker0
      state: up
      type: linux-bridge
    - ipv4:
        address:
        - ip: 192.168.66.101
          prefix-length: 24
        auto-dns: true
        auto-gateway: true
        auto-routes: true
        dhcp: true
        enabled: true
      ipv6:
        address:
        - ip: fe80::5055:ff:fed1:5501
          prefix-length: 64
        autoconf: false
        dhcp: false
        enabled: true
      mac-address: 52:55:00:D1:55:01
      mtu: 1500
      name: eth0
      state: up
      type: ethernet
    - ipv4:
        address: []
        auto-dns: true
        auto-gateway: true
        auto-routes: true
        dhcp: true
        enabled: true
      ipv6:
        address: []
        auto-dns: true
        auto-gateway: true
        auto-routes: true
        autoconf: true
        dhcp: true
        enabled: true
      mac-address: "52:54:00:12:34:56"
      mtu: 1500
      name: eth1
      state: down
      type: ethernet
    - ipv4:
        enabled: false
      ipv6:
        enabled: false
      mac-address: EA:0B:A9:20:CF:DC
      mtu: 1450
      name: flannel.1
      state: down
      type: unknown
    - ipv4:
        enabled: false
      ipv6:
        enabled: false
      mtu: 65536
      name: lo
      state: down
      type: unknown
    - ipv4:
        enabled: false
      ipv6:
        enabled: false
      mac-address: 0A:F0:1C:B9:08:F2
      mtu: 1450
      name: veth1dff4e1e
      state: down
      type: ethernet
    - ipv4:
        enabled: false
      ipv6:
        enabled: false
      mac-address: EE:61:20:58:66:3A
      mtu: 1450
      name: veth812db8a0
      state: down
      type: ethernet
    - ipv4:
        enabled: false
      ipv6:
        enabled: false
      mac-address: 82:40:08:CB:ED:30
      mtu: 1450
      name: vethb7811613
      state: down
      type: ethernet
    - ipv4:
        enabled: false
      ipv6:
        enabled: false
      mac-address: 2E:8E:F1:AE:B0:21
      mtu: 1450
      name: vethc5fd44f6
      state: down
      type: ethernet
    routes:
      config: []
      running:
      - destination: 10.244.0.0/24
        metric: 0
        next-hop-address: ""
        next-hop-interface: cni0
        table-id: 254
      - destination: 172.17.0.0/16
        metric: 0
        next-hop-address: ""
        next-hop-interface: docker0
        table-id: 254
      - destination: 0.0.0.0/0
        metric: 100
        next-hop-address: 192.168.66.2
        next-hop-interface: eth0
        table-id: 254
      - destination: 192.168.66.0/24
        metric: 100
        next-hop-address: ""
        next-hop-interface: eth0
        table-id: 254
      - destination: fe80::/64
        metric: 256
        next-hop-address: ""
        next-hop-interface: cni0
        table-id: 254
      - destination: fe80::/64
        metric: 256
        next-hop-address: ""
        next-hop-interface: eth0
        table-id: 254
      - destination: ff00::/8
        metric: 256
        next-hop-address: ""
        next-hop-interface: cni0
        table-id: 255
      - destination: ff00::/8
        metric: 256
        next-hop-address: ""
        next-hop-interface: eth0
        table-id: 255

If you want to learn more about the observedState API, see nmstate documentation.

Additional configuration

We can set the period of update time in seconds in config map in variable named node_network_state_refresh_interval.

We can also set filter for interfaces we wish to omit in reporting via interfaces_filter. This variable uses glob for pattern matching. For example we can use values such as: "" to keep all interfaces (disable filtering), "veth*" to omit all interfaces with veth prefix or "{veth*,vnet*}" to omit interfaces with either veth or vnet prefix.The default value is"veth*"`.

These variables are controlled via a ConfigMap:

apiVersion: v1
kind: ConfigMap
metadata:
  name: nmstate-config
  namespace: nmstate
data:
  node_network_state_refresh_interval: "5"
  interfaces_filter: "veth*"

Please note that in order to apply changes from the ConfigMap, you have to restart nmstate handler pods. That can be done by simply deleting them.