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update docs for coredns info

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Sandeep Rajan
2018-01-03 19:29:58 +05:30
parent 195110cfce
commit 4f15e85ad6
3 changed files with 6 additions and 3 deletions
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docs/tasks/administer-cluster/kubeadm-upgrade-1-9.md
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@@ -114,6 +114,8 @@ _____________________________________________________________________
The `kubeadm upgrade plan` checks that your cluster is upgradeable and fetches the versions available to upgrade to in an user-friendly way.
To check CoreDNS version, include the `--feature-gates=CoreDNS=true` flag to verify the CoreDNS version which will be installed in place of kube-dns.
3. Pick a version to upgrade to and run. For example:
```shell
@@ -162,6 +164,7 @@ $ kubeadm upgrade apply v1.9.0
[upgrade/kubelet] Now that your control plane is upgraded, please proceed with upgrading your kubelets in turn.
```
To upgrade the cluster with CoreDNS as the default internal DNS, invoke `kubeadm upgrade apply` with the `--feature-gates=CoreDNS=true` flag.
`kubeadm upgrade apply` does the following:
- Checks that your cluster is in an upgradeable state: