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kubeadm-ts: add entry about patching kube-proxy in CCM scenarios (#13033) 

This patch adds a entry in the kubeadm troubleshooting guide
about a problem that was found some time ago related to
kube-proxy DaemonSets and worker nodes in a CP setup.
pull/13413/head
Lubomir I. Ivanov 2019-03-26 02:55:15 +02:00 committed by Kubernetes Prow Robot
parent 6b8e146429
commit 6c41db7e62
1 changed files with 22 additions and 0 deletions
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22
content/en/docs/setup/independent/troubleshooting-kubeadm.md
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@ -280,4 +280,26 @@ but this will result in the key `enable-admission-plugins` only having the value
A known workaround is to use the kubeadm
[configuration file](/docs/setup/independent/control-plane-flags/#apiserver-flags).
## kube-proxy scheduled before node is initialized by cloud-controller-manager
In cloud provider scenarios, kube-proxy can end up being scheduled on new worker nodes before
the cloud-controller-manager has initialized the node addresses. This causes kube-proxy to fail
to pick up the node's IP address properly and has knock-on effects to the proxy function managing
load balancers.
The following error can be seen in kube-proxy Pods:
```
server.go:610] Failed to retrieve node IP: host IP unknown; known addresses: []
proxier.go:340] invalid nodeIP, initializing kube-proxy with 127.0.0.1 as nodeIP
```
A known solution is to patch the kube-proxy DaemonSet to allow scheduling it on control-plane
nodes regardless of their conditions, keeping it off of other nodes until their initial guarding
conditions abate:
```
kubectl -n kube-system patch ds kube-proxy -p='{ "spec": { "template": { "spec": { "tolerations": [ { "key": "CriticalAddonsOnly", "operator": "Exists" }, { "effect": "NoSchedule", "key": "node-role.kubernetes.io/master" } ] } } } }'
```
The tracking issue for this problem is [here](https://github.com/kubernetes/kubeadm/issues/1027).
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