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# rke2a
adamant-kite-43734
08/21/2025, 9:34 PMThis message was deleted.
c
creamy-pencil-82913
08/21/2025, 9:38 PMpass that arg in to what?
creamy-pencil-82913
08/21/2025, 9:39 PMI don’t believe you can run without ANY overlay network. How do you expect pods to do networking? You need to use one of the backends here: https://github.com/flannel-io/flannel/blob/master/Documentation/backends.md
creamy-pencil-82913
08/21/2025, 9:40 PMIn k3s, --flannel-backend=none turns off flannel entirely because you’re going to install a different CNI to provide pod networking. You can’t just disable it and replace it with nothing.
creamy-pencil-82913
08/21/2025, 9:43 PMThere is no option to the canal chart to run only calico for network policy, but disable flannel. You have no CNI without flannel. You would be left with only HostNetwork pods functional.
b
bright-lifeguard-9803
08/21/2025, 9:45 PMMy understanding is that with Canal, flannel only enters the picture when there's node-node comms via vxlan (or whatever.). The Calico part seems to do all the heavy lifting on the node local side of things.
bright-lifeguard-9803
08/21/2025, 9:45 PMMaybe I should just use Calico instead.
c
creamy-pencil-82913
08/21/2025, 9:46 PMNo. Canal is Calico for network policy, and Flannel for pod network. If you remove flannel, you have no pod network.
creamy-pencil-82913
08/21/2025, 9:46 PMb
bright-lifeguard-9803
08/21/2025, 9:58 PMFrom what I can see, calico-node (felix) is doing all the node-local stuff.
c
creamy-pencil-82913
08/21/2025, 9:59 PMyou still need something to set up the pod network, handle ipam, and so on.
creamy-pencil-82913
08/21/2025, 10:00 PMb
bright-lifeguard-9803
08/21/2025, 10:02 PMok that makes sense.
bright-lifeguard-9803
08/21/2025, 10:07 PMThen I need a way to set ConfigMap
kube-system/rke2-canal-configcanal_iface: <value>bright-lifeguard-9803
08/21/2025, 10:09 PMoh can I just set it in
/etc/rancher/rke2/config.yaml Copy code
cni: canal
canal-iface: eth1 # Or your desired network interfacebright-lifeguard-9803
08/21/2025, 10:09 PMthat's what AI says.
bright-lifeguard-9803
08/21/2025, 10:21 PMSeems like AI is making that up... I need a HelmChartConfig:
https://docs.rke2.io/networking/basic_network_options?_highlight=canal&_highlight=iface#select-a-cni-plugin
c
creamy-pencil-82913
08/21/2025, 10:31 PMcorrect
b
bright-lifeguard-9803
08/21/2025, 11:09 PMThanks @creamy-pencil-82913
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