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Add warning about google cloud repository versions 

I spent nearly a day trying to figure out what had gone wrong with repeated installations. Turns out google doesn't build and release every version of etcd to gcr - just random ones that they feel like. The documentation is updated to reflect that kops uses gcr for its etcd images and to check the gcr before just putting any version number.
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Tom Bull 2018-04-09 15:41:02 +08:00 committed by GitHub
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docs/cluster_spec.md
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@ -74,6 +74,8 @@ etcdClusters:
version: 3.0.17
```
> __Note:__ The images for etcd that kops uses are from the Google Cloud Repository. Google doesn't release every version of etcd to the gcr. Check that the version of etcd you want to use is available [at the gcr](https://console.cloud.google.com/gcr/images/google-containers/GLOBAL/etcd?gcrImageListsize=50) before using it in your cluster spec.
### sshAccess
This array configures the CIDRs that are able to ssh into nodes. On AWS this is manifested as inbound security group rules on the `nodes` and `master` security groups.