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Added documentation for Api server LB Certificate #5793

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Sep 17, 2018
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Added documentation for Api server LB Certificate #5793

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9 changes: 9 additions & 0 deletions docs/cluster_spec.md
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Expand Up @@ -46,6 +46,15 @@ spec:
idleTimeoutSeconds: 300
```

You can use a valid SSL Certificate for your API Server Load Balancer. Currently, only AWS is supported:

```yaml
spec:
api:
loadBalancer:
sslCertificate: arn:aws:acm:<region>:<accountId>:certificate/<uuid>
```

### etcdClusters v3 & tls

Although kops doesn't presently default to etcd3, it is possible to turn on both v3 and TLS authentication for communication amongst cluster members. These options may be enabled via the cluster spec (manifests only i.e. no command line options as yet). An upfront warning; at present no upgrade path exists for migrating from v2 to v3 so **DO NOT** try to enable this on a v2 running cluster as it must be done on cluster creation. The below example snippet assumes a HA cluster of three masters.
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