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Adds note on versionlock to README

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Note to users that auto-updates break clusters that don't lock the docker version somehow.
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Jonas Matser 2017-05-28 20:55:44 +02:00 committed by GitHub
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@ -57,10 +57,12 @@ Versions of supported components
[calicoctl](https://github.com/projectcalico/calico-docker/releases) v0.23.0 <br> [calicoctl](https://github.com/projectcalico/calico-docker/releases) v0.23.0 <br>
[canal](https://github.com/projectcalico/canal) (given calico/flannel versions) <br> [canal](https://github.com/projectcalico/canal) (given calico/flannel versions) <br>
[weave](http://weave.works/) v1.8.2 <br> [weave](http://weave.works/) v1.8.2 <br>
[docker](https://www.docker.com/) v1.13.1 <br> [docker](https://www.docker.com/) v1.13.1 (see note)<br>
[rkt](https://coreos.com/rkt/docs/latest/) v1.21.0 <br> [rkt](https://coreos.com/rkt/docs/latest/) v1.21.0 (see Note 2)<br>
Note: rkt support as docker alternative is limited to control plane (etcd and Note: kubernetes doesn't support newer docker versions. Among other things kubelet currently breaks on docker's non-standard version numbering (it no longer uses semantic versioning). To ensure auto-updates don't break your cluster look into e.g. yum versionlock plugin or apt pin).
Note 2: rkt support as docker alternative is limited to control plane (etcd and
kubelet). Docker is still used for Kubernetes cluster workloads and network kubelet). Docker is still used for Kubernetes cluster workloads and network
plugins' related OS services. Also note, only one of the supported network plugins' related OS services. Also note, only one of the supported network
plugins can be deployed for a given single cluster. plugins can be deployed for a given single cluster.