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The technology you are looking for is called Anycast. http://en.wikipedia.org/wiki/Anycast Anycast is a network addressing and routing methodology in which datagrams from a single sender are routed to the topologically nearest node in a group of potential receivers, though it may be sent to several nodes, all identified by the same destination ...


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You could setup a VPN across the cluster to use as your private network for etcd and the like. Another option is to build a small app that that acts as the endpoint and talks to the various data centers for you. This is might scale better but it depends on your needs.


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This depends on how much control and how much complexity you want to manage/afford. However, your biggest hurdle is if your datacenters are using a similar subnet schemes in multiple datacenters; example, using 172.16.0.0/24 in two or more datacenters. If all the datacenters are under your management and you can sign off on it, set up an MPLS between all ...



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