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Ron Stone 539fb24b44 Container Network Interface (CNI) Plugin Up-version

Add descriptions and examples of new CNI plugins.
Note: Bond plugin is covered in https://review.opendev.org/c/starlingx/docs/+/837599
Content restructuring per patchset 1 comments.
Patchset 2 review updates.
Patchset 3 review updates.
Fix merge conflict.
eth1001 > eth1000 for consistency in example.
Patchset 6 review updates.

Story: 2009832
Task: 45235

Signed-off-by: Ron Stone <ronald.stone@windriver.com>
Change-Id: Idab0308ff8f973c4aa20b66fbcfb932bf3dcf92c

2022-06-02 12:58:54 -04:00

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Tuning Plugin

The tuning plugin can change some system controls (sysctls) and interface attributes. It must be used as a chained plugin in conjunction with another interface-creating plugin.

The following options are used to configure the plugin:

name (string, required): The name of the network.
type (string, required): tuning
mac (string, optional): Set the MAC address of the interface.
mtu (integer, optional): Set the MTU of the interface.
promisc (bool, optional): Set the promiscuous mode of interface.
allmulti (bool, optional): Set the all-multicast mode of interface. If enabled, all multicast packets on the network will be received by the interface.
sysctl (object, optional): Change sysctls in the network namespace.

The following example creates a pod with an additional bridge interface which has its , , promiscuous mode, allmulti mode, and ipforwarding values changed by the tuning plugin. Note the chained nature of the plugins.

kind: NetworkAttachmentDefinitionapiVersion: "k8s.cni.cncf.io/v1"
metadata:
  name: bridge1
spec:
  config: '{
      "cniVersion": "0.3.1",
      "name": "bridgenet",
      "plugins": [
          {
              "type": "bridge",
              "bridge": "mybr0",
              "ipam": {
                  "type": "host-local",
                  "subnet": "10.10.10.0/24"
              }
          },
          {
              "name": "brtuning",
              "type": "tuning",
              "sysctl": {
                "net.ipv4.conf.net1.forwarding": "1"
              },
              "mtu": 9000,
              "mac": "c2:b0:57:49:47:f1",
              "promisc": true,
              "allmulti": true
          }
      ]
    }'
---
apiVersion: v1
kind: Pod
metadata:
  name: bridgepod1
  annotations:
    k8s.v1.cni.cncf.io/networks: '[
            { "name": "bridge1" }
    ]'
spec:
  containers:
  - name: bridge1
    image: centos/tools
    imagePullPolicy: IfNotPresent
    command: [ "/bin/bash", "-c", "--" ]
    args: [ "while true; do sleep 300000; done;" ]

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Tuning Plugin

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