OpenShift: OVN MTU problems #788
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In some cases when deploying in baremetal we can see that
ovnkube-controller fails to run with following error:
```
F0225 17:50:08.720752 34371 ovnkube.go:136] failed to run ovnkube: failed to start network controller: failed to start default network controller - while waiting for any node to have zone: "devin01.rhos.lab.eng.brq2.redhat.com.141.37.10.in-addr.arpa", error: context canceled
failed to start node network controller: failed to start default node network controller: interface MTU (1500) is too small for specified overlay MTU (1558)
```
We can see in etc that the MTU is set to 1500 instead of the default
1400:
```
$ sudo crictl exec -it $(sudo crictl ps |grep etcdctl | cut -f1 -d' ') etcdctl get /kubernetes.io/operator.openshift.io/networks/cluster | tail -n2 | jq .|grep mtu
"f:mtu": {},
"f:mtu": {}
"mtu": 1500,
```
This patch fixes this problem by ensure we always use file `99-ovn.yaml`
to force the MTU.
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In some cases when deploying in baremetal we can see that ovnkube-controller fails to run with following error:
We can see in etc that the MTU is set to 1500 instead of the default 1400:
This patch fixes this problem by ensure we always use file
99-ovn.yamlto force the MTU.