默認情況下Docker容器需要跨主機通信兩個主機節點都需要在同一個網段下，這時只要兩個Docker容器的宿主機能相互通信并且該容器使用net網絡模式，改實現方式為網橋模式通信；
除此之外我們還可以通過使用第三方工具為不同主機間創建一個覆蓋網絡，使之能夠 跨節點通信 ，這里將使用Flanneld實現；
安裝etcd
創建 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"
創建/etc/systemd/system/etcd.service文件
[Unit]Description=Etcd ServerAfter=network.targetAfter=network-online.targetWants=network-online.targetDocumentation=https://github.com/coreos[Service]Type=notifyWorkingDirectory=/var/lib/etcd/EnvironmentFile=-/etc/etcd/etcd.confExecStart=/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-failureRestartSec=5LimitNOFILE=65536[Install]WantedBy=multi-user.target啟動systemctl start etcd
在etcd中創建目錄：etcdctl --endpoints=http://192.168.2.150:2379,http://192.168.5.151:2379
mkdir /kube-centos/network
創建config節點并寫入網絡配置信息：
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
創建 /etc/sysconfig/flanneld文件
# Flanneld configuration options # etcd url location. Point this to the server where etcd runsFLANNEL_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 passFLANNEL_OPTIONS="-iface=eth0"
創建/usr/lib/systemd/system/flanneld.service文件
[Unit]Description=Flanneld overlay address etcd agentAfter=network.targetAfter=network-online.targetWants=network-online.targetAfter=etcd.serviceBefore=docker.service[Service]Type=notifyEnvironmentFile=/etc/sysconfig/flanneldEnvironmentFile=-/etc/sysconfig/docker-network#ExecStart=/usr/bin/flanneld-start $FLANNEL_OPTIONSExecStart=/usr/bin/flanneld-start -etcd-endpoints=http://192.168.2.150:2379,http://192.168.2.151:2379 - iface=ens33#ExecStart=/usr/bin/flanneld-start -etcd-endpoints=http://192.168.2.150:2379,http://192.168.2.151:2379 -etcd- prefix=/kube-centos/networkExecStartPost=/usr/libexec/flannel/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/dockerRestart=on-failure[Install]WantedBy=multi-user.targetRequiredBy=docker.service
啟動systemctl start flanneld
flannled啟動后會生產/run/flannel/subnet.env文件
修改docker啟動參數配置加上：
EnvironmentFile=/run/flannel/subnet.env--bip=${FLANNEL_SUBNET} --ip-masq=${FLANNEL_IPMASQ} --mtu=${FLANNEL_MTU}重啟docker，此時docker將使用flanneld配置的網段為container分配ip；
在兩個節點分別啟動容器：docker run -it –rm busybox sh
查看其中一個主機節點的容器IP，ping另一個主機節點IP
查看其中一個主機節點的容器IP，ping另一個主機節點IP
此時已可聯通；
注意iptables配置是否正確；
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持VEVB武林網。
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