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kubernetes/docs/proposals/flannel-integration.md
Prashanth Balasubramanian 321bc73264 Flannel server in static pod with private etcd.
2015-11-25 09:42:59 +01:00

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Flannel integration with Kubernetes

Why?

  • Networking works out of the box.
  • Cloud gateway configuration is regulated.
  • Consistent bare metal and cloud experience.
  • Lays foundation for integrating with networking backends and vendors.

How?

Master                      Node1
---------------------|--------------------------------
database             |
    |                |
{10.250.0.0/16}      |         docker
    |         here's podcidr    |restart with podcidr
apiserver <------------------- kubelet
    |                |          |here's podcidr
flannel-server:10253 <------- flannel-daemon
                     --/16--->
                     <--watch--  [config iptables]
                subscribe to new node subnets
                      -------->   [config VXLan]
                     |

There is a tiny lie in the above diagram, as of now, the flannel server on the master maintains a private etcd. This will not be necessary once we have a generalized network resource, and a Kubernetes x flannel backend.

Limitations

  • Integration is experimental

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