配置docker 和 flannel
ETCD集群安装：http://crabdave.iteye.com/blog/2365488
flannel参数设置
集群中flannel的可用子网段和网络包封装方式等配置信息需要提前写入ETCD中(10.99.0.10为master，注意复制时别换行)：
curl -L http://10.99.0.10:2380/v2/keys/flannel/network/config -XPUT -d value="{\"Network\":\"172.16.0.0/16\",\"SubnetLen\":25,\"Backend\":{\"Type\":\"vxlan\",\"VNI\":1}}"
写入ETCD中的key为 /flannel/network/config ，后面配置flannel服务时需要用到。配置项中的 Network 为整个k8s集群可用的子网段；SubnetLen为每个Node结点的子网掩码长度；Type表示封包的方式，推荐使用vxlan，此外还有udp等方式。
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node机器上安装docker 和 flannel
yum install -y docker flannel
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配置flanneld
/etc/sysconfig/flanneld
echo 'FLANNEL_ETCD="http://10.99.0.10:2380,http://10.99.0.12:2380,http://10.99.0.11:2380"
FLANNEL_ETCD_KEY="/flannel/network"
FLANNEL_OPTIONS="-iface=eth1"' > /etc/sysconfig/flanneld
flannel参考
http://blog.csdn.net/liukuan73/article/details/54897594
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停止docker
systemctl stop docker.service
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启动Flannel
systemctl daemon-reload
systemctl restart flanneld
systemctl status -l flanneld
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启动docker
systemctl start docker.service
测试网络
docker run -it --rm=true busybox sh
ifconfig
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flannel.1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1400
inet 172.16.29.0 netmask 255.255.255.255 broadcast 0.0.0.0
eth0 Link encap:Ethernet HWaddr 02:42:AC:10:1D:02
inet addr:172.16.29.2 Bcast:0.0.0.0 Mask:255.255.255.128
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flannel.1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1400
inet 172.16.23.0 netmask 255.255.255.255 broadcast 0.0.0.0
eth0 Link encap:Ethernet HWaddr 02:42:AC:10:17:02
inet addr:172.16.23.2 Bcast:0.0.0.0 Mask:255.255.255.128
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