MULTUS CNI plugin

Please read CNI for more information on container networking.

Multus is the latin word for “Multi”

As name suggest, it act as the Multi plugin in the Kubernetes and provides the Multi interface support in pod

It is generic to run with other plugins like ptp, local-host, with flannel, with different IPAM and networks.

It contact between the container runtime and other plugins, and it not having any of it own net configuration, it call other plugins like flannel/calico to do real net conf job. Multus reuse the concept of invoking the delegates in the flannel, it group the multi plugins into delegates and invoke each other in the sequential order, according to the JSON scheme in the cni configuration.

Build

This plugin requires Go 1.5+ to build.

Go 1.5 users will need to set GO15VENDOREXPERIMENT=1 to get vendored dependencies. This flag is set by default in 1.6.

#./build

Network configuration reference

• name (string, required): the name of the network
• type (string, required): "multus"
• delegate (([]map,required): number of delegate details in the Multus
• masterplugin (bool,required): master plugin to report back to container

Usage

Given the following network configuration:

# tee /etc/cni/net.d/multus-cni.conf <<-'EOF'
{
    "name": "minion1-multus-demo-network",
    "type": "multus",
    "delegates": [
        {
                "type": "sriov",
                "if0": "enp12s0f0",
                "if0name": "north0",
                "createmac": true,
                "ipam": {
                        "type": "host-local",
                        "subnet": "10.56.217.0/24",
                        "rangeStart": "10.56.217.131",
                        "rangeEnd": "10.56.217.190",
                        "routes": [
                                { "dst": "0.0.0.0/0" }
                        ],
                        "gateway": "10.56.217.1"
                }
        },
        {
                "type": "sriov",
                "if0": "enp12s0f1",
                "if0name": "south0",
                "ipam": {
                        "type": "host-local",
                        "subnet": "10.56.217.0/24",
                        "rangeStart": "10.56.217.100",
                        "rangeEnd": "10.56.217.130",
                        "routes": [
                                { "dst": "0.0.0.0/0" }
                        ],
                        "gateway": "10.56.217.1"
                }
        },
        {
                "type": "flannel",
                "masterplugin": true,
                "delegate": {
                        "isDefaultGateway": true
                }
        }
    ]
}
EOF

Testing the Multus CNI with docker, and make sure that the multus, sriov and flannel binaries are in the /opt/cni/bin directories and follow the steps as mention in the CNI