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Update run_in_existing_vpc.md for shared subnets tags

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Eric Hole 2017-01-24 22:02:18 -05:00 committed by GitHub
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docs/run_in_existing_vpc.md
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@ -114,6 +114,8 @@ kops update cluster ${CLUSTER_NAME}
kops update cluster ${CLUSTER_NAME} --yes
```
If you run in AWS private topology with shared subnets, and you would like Kubernetes to provision resources in these shared subnets, you must create tags on them with Key=value `KubernetesCluster=<clustername>`. This is important, for example, if your `utility` subnets are shared, you will not be able to launch any services that create Elastic Load Balancers (ELBs).
### Shared NAT Gateways
On AWS in private [topology](docs/topology.md), `kops` creates one NAT Gateway (NGW) per AZ. If your shared VPC is already set up with an NGW in the subnet that `kops` deploys private resources to, it is possible to specify the ID and have `kops`/`kubernetes` use it.