75 lines
2.2 KiB
Markdown
75 lines
2.2 KiB
Markdown
# Multus
|
|
|
|
Multus is a meta CNI plugin that provides multiple network interface support to
|
|
pods. For each interface, Multus delegates CNI calls to secondary CNI plugins
|
|
such as Calico, macvlan, etc.
|
|
|
|
See [multus documentation](https://github.com/intel/multus-cni).
|
|
|
|
## Multus installation
|
|
|
|
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,
|
|
|
|
```yml
|
|
kube_network_plugin: calico
|
|
kube_network_plugin_multus: true
|
|
```
|
|
|
|
will install Multus and Calico and configure Multus to use Calico as the primary network plugin.
|
|
|
|
## Using Multus
|
|
|
|
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.
|
|
|
|
```ShellSession
|
|
cat <<EOF | kubectl create -f -
|
|
apiVersion: "k8s.cni.cncf.io/v1"
|
|
kind: NetworkAttachmentDefinition
|
|
metadata:
|
|
name: macvlan-conf
|
|
spec:
|
|
config: '{
|
|
"cniVersion": "0.3.0",
|
|
"type": "macvlan",
|
|
"master": "eth0",
|
|
"mode": "bridge",
|
|
"ipam": {
|
|
"type": "host-local",
|
|
"subnet": "192.168.1.0/24",
|
|
"rangeStart": "192.168.1.200",
|
|
"rangeEnd": "192.168.1.216",
|
|
"routes": [
|
|
{ "dst": "0.0.0.0/0" }
|
|
],
|
|
"gateway": "192.168.1.1"
|
|
}
|
|
}'
|
|
EOF
|
|
```
|
|
|
|
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.
|
|
|
|
```ShellSession
|
|
cat <<EOF | kubectl create -f -
|
|
apiVersion: v1
|
|
kind: Pod
|
|
metadata:
|
|
name: samplepod
|
|
annotations:
|
|
k8s.v1.cni.cncf.io/networks: macvlan-conf
|
|
spec:
|
|
containers:
|
|
- name: samplepod
|
|
command: ["/bin/bash", "-c", "sleep 2000000000000"]
|
|
image: dougbtv/centos-network
|
|
EOF
|
|
```
|
|
|
|
You may now inspect the pod and see that there is an additional interface configured:
|
|
|
|
```ShellSession
|
|
kubectl exec -it samplepod -- ip a
|
|
```
|
|
|
|
For more details on how to use Multus, please visit <https://github.com/intel/multus-cni>
|