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Document workaround for kubeadm Taints field issue (#13343) 

* Document workaround for kubeadm Taints field issue

* Remove trailing whitespace in kubeadm troubleshooting
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Daniel Lipovetsky 2019-04-09 22:14:12 -07:00 committed by Kubernetes Prow Robot
parent bd8721baad
commit 783a2d5289
1 changed files with 17 additions and 1 deletions
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content/en/docs/setup/independent/troubleshooting-kubeadm.md
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@ -302,4 +302,20 @@ kubectl -n kube-system patch ds kube-proxy -p='{ "spec": { "template": { "spec":
The tracking issue for this problem is [here](https://github.com/kubernetes/kubeadm/issues/1027). The tracking issue for this problem is [here](https://github.com/kubernetes/kubeadm/issues/1027).
## The NodeRegistration.Taints field is omitted when marshalling kubeadm configuration
*Note: This [issue](https://github.com/kubernetes/kubeadm/issues/1358) only applies to tools that marshal kubeadm types (e.g. to a YAML configuration file). It will be fixed in kubeadm API v1beta2.*
By default, kubeadm applies the `role.kubernetes.io/master:NoSchedule` taint to control-plane nodes.
If you prefer kubeadm to not taint the control-plane node, and set `InitConfiguration.NodeRegistration.Taints` to an empty slice,
the field will be omitted when marshalling. When the field is omitted, kubeadm applies the default taint.
There are at least two workarounds:
1. Use the `role.kubernetes.io/master:PreferNoSchedule` taint instead of an empty slice. [Pods will get scheduled on masters](https://kubernetes.io/docs/concepts/configuration/taint-and-toleration/), unless other nodes have capacity.
2. Remove the taint after kubeadm init exits:
```bash
kubectl taint nodes NODE_NAME role.kubernetes.io/master:NoSchedule-
```
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