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43 lines
1.9 KiB
43 lines
1.9 KiB
# Use Calico instead of Flannel
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If you want to use NetworkPolicy you can use Calico in k3s instead of Flannel.
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### 1. Download and modify the Calico descriptor
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You can following the [documentation](https://docs.projectcalico.org/master/reference/cni-plugin/configuration)
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And then you have to change the ConfigMap `calico-config`. On the `cni_network_config` add the entry for allowing IP forwarding
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```json
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"container_settings": {
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"allow_ip_forwarding": true
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}
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```
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Or you can directly use this [calico.yaml](calico.yaml) manifest
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## 2. Create the cluster without flannel and with calico
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On the k3s cluster creation :
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- add the flag `--flannel-backend=none`. For this, on k3d you need to forward this flag to k3s with the option `--k3s-server-arg`.
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- mount (`--volume`) the calico descriptor in the auto deploy manifest directory of k3s `/var/lib/rancher/k3s/server/manifests/`
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So the command of the cluster creation is (when you are at root of the k3d repository)
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```bash
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k3d cluster create "${clustername}" --k3s-server-arg '--flannel-backend=none' --volume "$(pwd)/docs/usage/guides/calico.yaml:/var/lib/rancher/k3s/server/manifests/calico.yaml"
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```
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In this example :
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- change `"${clustername}"` with the name of the cluster (or set a variable).
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- `$(pwd)/docs/usage/guides/calico.yaml` is the absolute path of the calico manifest, you can adapt it.
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You can add other options, [see](../commands.md).
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The cluster will start without flannel (and without other CNI).
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For watching for the pod(s) deployment
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```
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watch "kubectl get pods -n kube-system"
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```
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Note :
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- you can use the auto deploy manifest or a kubectl apply depending on your needs
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- <!> Calico is not as quick as Flannel (but it provides more features)
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## References
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https://rancher.com/docs/k3s/latest/en/installation/network-options/
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https://docs.projectcalico.org/getting-started/kubernetes/k3s/
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