c12s-kubespray/docs/kube-ovn.md

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# Kube-OVN
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Kube-OVN integrates the OVN-based Network Virtualization with Kubernetes. It offers an advanced Container Network Fabric for Enterprises.
For more information please check [Kube-OVN documentation](https://github.com/alauda/kube-ovn)
**Warning:** Kernel version (`cat /proc/version`) needs to be different than `3.10.0-862` or kube-ovn won't start and will print this message:
```bash
kernel version 3.10.0-862 has a nat related bug that will affect ovs function, please update to a version greater than 3.10.0-898
```
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## How to use it
Enable kube-ovn in `group_vars/k8s_cluster/k8s_cluster.yml`
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```yml
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...
kube_network_plugin: kube-ovn
...
```
## Verifying kube-ovn install
Kube-OVN run ovn and controller in `kube-ovn` namespace
* Check the status of kube-ovn pods
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```ShellSession
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# From the CLI
kubectl get pod -n kube-ovn
# Output
NAME READY STATUS RESTARTS AGE
kube-ovn-cni-49lsm 1/1 Running 0 2d20h
kube-ovn-cni-9db8f 1/1 Running 0 2d20h
kube-ovn-cni-wftdk 1/1 Running 0 2d20h
kube-ovn-controller-68d7bb48bd-7tnvg 1/1 Running 0 2d21h
ovn-central-6675dbb7d9-d7z8m 1/1 Running 0 4d16h
ovs-ovn-hqn8p 1/1 Running 0 4d16h
ovs-ovn-hvpl8 1/1 Running 0 4d16h
ovs-ovn-r5frh 1/1 Running 0 4d16h
```
* Check the default and node subnet
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```ShellSession
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# From the CLI
kubectl get subnet
# Output
NAME PROTOCOL CIDR PRIVATE NAT
join IPv4 100.64.0.0/16 false false
ovn-default IPv4 10.16.0.0/16 false true
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```