Flannel網絡配置
Flannel工作原理
Flannel是一種覆蓋網絡(overlay network),將TCP數據包裝在另一種網絡包裏面進行路由轉發和通訊,轉發方式:UDP 、VxLAN 、GCE、AWS VPC等。
專門為kubernetes定制的三層網絡解決方案,用於解決容器的跨主機通訊。
Flannel通過ETCD維護一張節點間路由表,詳細記錄了各節點子網網段。
FLannel配置
1.添加flannel網絡配置信息到etcd
#/opt/kubernetes/bin/etcdctl --ca-file /opt/kubernetes/ssl/ca.pem --cert-file /opt/kubernetes/ssl/flanneld.pem --key-file /opt/kubernetes/ssl/flanneld-key.pem --no-sync -C https://192.168.56.11:2379,https://192.168.56.14:2379 mk /kubernetes/network/config ‘{"Network": "10.3.0.0/16","Backend":{"Type": "vxlan", "VNI": 1}}‘
2.安裝flannel
wget https://github.com/coreos/flannel/releases/download/v0.10.0/flannel-v0.10.0-linux-amd64.tar.gz
tar zxf flannel-v0.10.0-linux-amd64.tar.gz
cp flanneld mk-docker-opts.sh /opt/kubernetes/bin/
3.配置flannel
cat /opt/kubernetes/cfg/flannel
FLANNEL_ETCD="-etcd-endpoints=https://192.168.56.11:2379,https://192.168.56.14:2379"
FLANNEL_ETCD_CAFILE="--etcd-cafile=/opt/kubernetes/ssl/ca.pem"
FLANNEL_ETCD_CERTFILE="--etcd-certfile=/opt/kubernetes/ssl/flanneld.pem"
FLANNEL_ETCD_KEYFILE="--etcd-keyfile=/opt/kubernetes/ssl/flanneld-key.pem"
cat /usr/lib/systemd/system/flannel.service [Unit] Description=Flanneld overlay address etcd agent After=network.target Before=docker.service [Service] EnvironmentFile=-/opt/kubernetes/cfg/flannel #ExecStartPre=/opt/kubernetes/bin/remove-docker0.sh ExecStart=/opt/kubernetes/bin/flanneld ${FLANNEL_ETCD} ${FLANNEL_ETCD_KEY} ${FLANNEL_ETCD_CAFILE} ${FLANNEL_ETCD_CERTFILE} ${FLANNEL_ETCD_KEYFILE} ExecStartPost=/opt/kubernetes/bin/mk-docker-opts.sh -d /run/flannel/docker Type=notify [Install] WantedBy=multi-user.target RequiredBy=docker.service
4.啟動
啟動flannel之後,重啟docker
Flannel網絡配置