{"action":"created","comment":{"url":"https://api.github.com/repos/openshift/openshift-docs/pulls/comments/84150285","pull_request_review_id":4945881,"id":84150285,"diff_hunk":"@@ -14,34 +14,34 @@ toc::[]\n This topic describes how to set up highly-available services on your\n {product-title} cluster.\n \n-The Kubernetes\n-xref:../architecture/core_concepts/deployments.adoc#replication-controllers[replication\n-controller] ensures that the deployment requirements, in particular the number\n-of replicas, are satisfied when the appropriate resources are available. When\n-run with two or more replicas, the\n-xref:../architecture/core_concepts/routes.adoc#routers[router] can be resilient\n-to failures, providing a highly-available service. Depending on how the router\n-instances are discovered (via a service, DNS entry, or IP addresses), this could\n-impose operational requirements to handle failure cases when one or more router\n-instances are \"unreachable\".\n+IP Failover uses link:http://www.keepalived.org/[*Keepalived*] to host a set of externally accessible\n+Virtual IP (VIP) addresses on a set of hosts.  Each VIP is serviced by, at most, one of the hosts at\n+any point in time.  *Keepalived* uses the VRRP protocol to determine which host in the set of hosts\n+will service each VIP address.  If a host goes down or the service that it is watching goes down the\n+VIP is serviced from another host in the set. As long as a single host is availble the VIP is 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