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fix DNS containers information in dns.md #15425

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Oct 15, 2015
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fix DNS containers information in dns.md #15425

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4 changes: 2 additions & 2 deletions docs/admin/dns.md
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Expand Up @@ -52,8 +52,8 @@ supports forward lookups (A records) and service lookups (SRV records).

## How it Works

The running DNS pod holds 3 containers - skydns, etcd (a private instance which skydns uses),
and a Kubernetes-to-skydns bridge called kube2sky. The kube2sky process
The running DNS pod holds 4 containers - skydns, etcd (a private instance which skydns uses),
a Kubernetes-to-skydns bridge called kube2sky, and a health check called healthz. The kube2sky process
watches the Kubernetes master for changes in Services, and then writes the
information to etcd, which skydns reads. This etcd instance is not linked to
any other etcd clusters that might exist, including the Kubernetes master.
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