75 lines
2.2 KiB
Markdown
75 lines
2.2 KiB
Markdown
# Multus
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Multus is a meta CNI plugin that provides multiple network interface support to
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pods. For each interface, Multus delegates CNI calls to secondary CNI plugins
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such as Calico, macvlan, etc.
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See [multus documentation](https://github.com/k8snetworkplumbingwg/multus-cni).
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## Multus installation
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Since Multus itself does not implement networking, it requires a master plugin, which is specified through the variable `kube_network_plugin`. To enable Multus an additional variable `kube_network_plugin_multus` must be set to `true`. For example,
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```yml
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kube_network_plugin: calico
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kube_network_plugin_multus: true
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```
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will install Multus and Calico and configure Multus to use Calico as the primary network plugin.
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## Using Multus
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Once Multus is installed, you can create CNI configurations (as a CRD objects) for additional networks, in this case a macvlan CNI configuration is defined. You may replace the config field with any valid CNI configuration where the CNI binary is available on the nodes.
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```ShellSession
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cat <<EOF | kubectl create -f -
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apiVersion: "k8s.cni.cncf.io/v1"
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kind: NetworkAttachmentDefinition
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metadata:
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name: macvlan-conf
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spec:
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config: '{
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"cniVersion": "0.4.0",
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"type": "macvlan",
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"master": "eth0",
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"mode": "bridge",
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"ipam": {
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"type": "host-local",
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"subnet": "192.168.1.0/24",
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"rangeStart": "192.168.1.200",
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"rangeEnd": "192.168.1.216",
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"routes": [
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{ "dst": "0.0.0.0/0" }
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],
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"gateway": "192.168.1.1"
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}
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}'
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EOF
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```
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You may then create a pod with and additional interface that connects to this network using annotations. The annotation correlates to the name in the NetworkAttachmentDefinition above.
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```ShellSession
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cat <<EOF | kubectl create -f -
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apiVersion: v1
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kind: Pod
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metadata:
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name: samplepod
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annotations:
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k8s.v1.cni.cncf.io/networks: macvlan-conf
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spec:
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containers:
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- name: samplepod
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command: ["/bin/bash", "-c", "sleep 2000000000000"]
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image: dougbtv/centos-network
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EOF
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```
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You may now inspect the pod and see that there is an additional interface configured:
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```ShellSession
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kubectl exec -it samplepod -- ip a
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```
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For more details on how to use Multus, please visit <https://github.com/k8snetworkplumbingwg/multus-cni>
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