docker overlay network

* docker overlay network
** multi host deploy arch
    +-------------------- VM1 ------------------+                +-------------------- VM2 ------------------+
    |    +-------+      +-------+  +-------+    |                |    +-------+      +-------+  +-------+    |
    |    |  KV   |      | App 1 |  | App 2 |    |                |    |  KV   |      | App 1 |  | App 2 |    |
    |    +-------+      +-------+  +-------+    |                |    +-------+      +-------+  +-------+    |
    |    +---------------------------------+    |                |    +---------------------------------+    |
    |    |            docker               |    |                |    |            docker               |    |
    |    +---------------------------------+    |                |    +---------------------------------+    |
    +----------------- region 1 ----------------+                +----------------- region 2 ----------------+
    *** distributed kv (consul, etcd, zookeeper etc.) for storing vxlan information
    *** using public network ip for cross region / using private network ip for same region
** docker overlay network arch
    +------------------------------  VM  ----------------------------------+
    |    +------------------- container  adapter ---------------------+    |
    |    |  +-----------------------+      +-----------------------+  |    |
    |    |  |         eth1          |      |          eth0         |  |    |
    |    |  |     192.168.16.6      |      |        10.0.0.2       |  |    |
    |    |  +----------|------------+      +------------|----------+  |    |
    |    +-------------|--------------------------------|-------------+    |
    |                  |                                |                  |
    |    +-------------|------ virtual  adapter --------V-------------+    |
    |    |             V                           +-- veth --+       |    |
    |    |  +---------- vm ---------+      +---------- ns ---------+  |    |
    |    |  |    docker_gwbridge    |      |           br0         |  |    |
    |    |  |    192.168.16.1/20    |      |       10.0.0.1        |  |    |
    |    |  +----------|------------+      +-----------|-----------+  |    |
    |    |             |                   +-------- vxlan --------+  |    |
    |    +-------------|-------------------------------|--------------+    |
    |             NAT  |                               |                   |
    |                  |------------------------------ |                   |
    |                                                  |                   |
    |    +-------------------- physical adapter -------V--------------+    |
    |    |  +-----------------------+      +-----------------------+  |    |
    |    |  |         eth0          |      |         eth1          |  |    |
    |    |  |     10.251.22.206     |      |     121.42.163.81     |  |    |
    |    |  +-----------------------+      +-----------------------+  |    |
    |    +------------------------------------------------------------+    |
    +----------------------------------------------------------------------+
** using docker overlay network in aliyun ecs
   *** upgrade linux kernel to > 3.16
            sudo apt-get install linux-generic-lts-vivid
   *** install distributed kv (consul, etcd, zookeeper etc. ) and run
            curl -OL https://dl.bintray.com/mitchellh/consul/0.5.2_linux_amd64.zip
   *** docker create overlay network
        docker network create -d overlay prod
   *** docker run with overlay network
        docker run -t -t --net prod ubuntu /bin/bash
   *** set namespace bridge and arp
        ip netns exec 1-63e4c396fe bridge fdb add 02:42:0a:00:00:03 dev vxlan1 dst 121.42.163.81
        ip netns exec ca993c48d217 arp -s 10.0.0.3 02:42:0a:00:00:03
** reference docs
    http://115.28.140.124:8000
    https://github.com/docker/libnetwork/blob/master/docs/overlay.md
    http://askubuntu.com/questions/636221/ubuntu-14-04-with-3-19-kernel-wants-to-update-to-3-16
    http://hustcat.github.io/docker-overlay-network-practice/
    http://hustcat.github.io/overlay-network-base-ovs/
    http://www.slideshare.net/neependra/docker-multi-host-networking-rachit-arora-ibm
    http://sirile.github.io/2015/09/30/cassandra-cluster-on-docker-swarm-and-overlay-networking-using-docker-experimental-1.9.html
    https://github.com/docker/docker/releases