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UPdate docs to match actuall required settings to perform an unsafe upgrade using cluster.yml playbook. Relates to https://github.com/kubernetes-sigs/kubespray/issues/4736 and https://github.com/kubernetes-sigs/kubespray/issues/4139 (#5609)

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Flowkap 2020-02-17 10:45:29 +01:00 committed by GitHub
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@ -25,15 +25,17 @@ If you wanted to upgrade just kube_version from v1.4.3 to v1.4.6, you could
deploy the following way:
```ShellSession
ansible-playbook cluster.yml -i inventory/sample/hosts.ini -e kube_version=v1.4.3
ansible-playbook cluster.yml -i inventory/sample/hosts.ini -e kube_version=v1.4.3 -e upgrade_cluster_setup=true
```
And then repeat with v1.4.6 as kube_version:
```ShellSession
ansible-playbook cluster.yml -i inventory/sample/hosts.ini -e kube_version=v1.4.6
ansible-playbook cluster.yml -i inventory/sample/hosts.ini -e kube_version=v1.4.6 -e upgrade_cluster_setup=true
```
The var ```-e upgrade_cluster_setup=true``` is needed to be set in order to migrate the deploys of e.g kube-apiserver inside the cluster immediately which is usually only done in the graceful upgrade. (Refer to [#4139](https://github.com/kubernetes-sigs/kubespray/issues/4139) and [#4736](https://github.com/kubernetes-sigs/kubespray/issues/4736))
## Graceful upgrade
Kubespray also supports cordon, drain and uncordoning of nodes when performing