默认情况下Docker容器需要跨主机通信两个主机节点都需要在同一个网段下，这时只要两个Docker容器的宿主机能相互通信并且该容器使用net网络模式，改实现方式为网桥模式通信；
除此之外我们还可以通过使用第三方工具为不同主机间创建一个覆盖网络，使之能够 跨节点通信 ，这里将使用Flanneld实现；
安装etcd
创建 cat /etc/etcd/etcd.conf文件
# [member] ETCD_NAME=infra1
ETCD_DATA_DIR="/var/lib/etcd"
ETCD_LISTEN_PEER_URLS="http://192.168.2.150:2380"
ETCD_LISTEN_CLIENT_URLS="http://192.168.2.150:2379" #[cluster] ETCD_INITIAL_ADVERTISE_PEER_URLS="http://192.168.2.150:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_ADVERTISE_CLIENT_URLS="http://192.168.2.150:2379"
创建/etc/systemd/system/etcd.service文件
[Unit]Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
Documentation=https://github.com/coreos[Service]Type=notify
WorkingDirectory=/var/lib/etcd/
EnvironmentFile=-/etc/etcd/etcd.conf
ExecStart=/usr/local/bin/etcd
--name ${ETCD_NAME}
--initial-advertise-peer-urls ${ETCD_INITIAL_ADVERTISE_PEER_URLS}
--listen-peer-urls ${ETCD_LISTEN_PEER_URLS}
--listen-client-urls ${ETCD_LISTEN_CLIENT_URLS},http://127.0.0.1:2379
--advertise-client-urls ${ETCD_ADVERTISE_CLIENT_URLS}
--initial-cluster-token ${ETCD_INITIAL_CLUSTER_TOKEN}
--initial-cluster infra1=http://192.168.2.150:2380,infra2=http://192.168.2.151:2380
--initial-cluster-state new
--data-dir=${ETCD_DATA_DIR}
Restart=on-failure
RestartSec=5
LimitNOFILE=65536[Install]WantedBy=multi-user.target启动systemctl start etcd
在etcd中创建目录：etcdctl –endpoints=http://192.168.2.150:2379,http://192.168.5.151:2379
mkdir /kube-centos/network创建config节点并写入网络配置信息：
etcdctl --endpoints=http://172.20.0.113:2379,http://172.20.0.114:2379
mk /kube-centos/network/config '{"Network":"192.167.0.0/16","SubnetLen":24,"Backend":{"Type":"vxlan"}}'Flanneld
创建 /etc/sysconfig/flanneld文件
# Flanneld configuration options
# etcd url location. Point this to the server where etcd runs
FLANNEL_ETCD_ENDPOINTS="http://127.0.0.1:2379"# etcd config key. This is the configuration key that flannel queries
# For address range assignment
# FLANNEL_ETCD_PREFIX="/kube-centos/network"
FLANNEL_ETCD_PREFIX="/coreos.com/network"
# Any additional options that you want to pass
FLANNEL_OPTIONS="-iface=eth0"
