docker結合flannel網絡

Etcd安裝

生產環境建議使用集群方式

wget?https://github.com/etcd-io/etcd/releases/download/v3.3.15/etcd-v3.3.15-linux-amd64.tar.gz
tar?-zxvf?etcd-v3.3.15-linux-amd64.tar.gz?&&?cd?etcd-v3.3.15-linux-amd64
mv?etcd*?/usr/local/bin/
mkdir?/var/lib/etcd/

cat?/usr/lib/systemd/system/etcd.service?
[Unit]
Description=Etcd?Server
After=netNork.target
After=network-online.target
Wants=network-online.target
[Service]
Type=notify
ExecStart=/usr/local/bin/etcd?\
--name=etcd?\
--data-dir=/var/lib/etcd/default.etcd?\
--listen-peer-urls=http://192.168.3.155:2380?\
--listen-client-urls=http://192.168.3.155:2379,http://127.0.0.1:2379?\
--advertise-client-urls=http://192.168.3.155:2379?\
--initial-advertise-peer-urls=http://192.168.3.155:2380?\
--initial-cluster=etcd=http://192.168.3.155:2380?\
--initial-cluster-token=etcd-cluster?\
--initial-cluster-state=new
Restart=on-failure
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target

systemctl start etcd

安裝flannel

yum -y install flannel

cat /etc/sysconfig/flanneld

FLANNEL_ETCD_ENDPOINTS="http://192.168.3.155:2379"

FLANNEL_ETCD_PREFIX="/atomic.io/network"

注冊flannel的網絡配置到etcd

3.3.15版本默認api為V3，flannel支持V2版本

ETCDCTL_API=2 etcdctl --endpoint=http://192.168.3.155:2379 set /atomic.io/network/config '{"Network":"172.17.0.0/16", "SubnetMin": "172.17.1.0", "SubnetMax": "172.17.254.0", "Backend": {"Type": "vxlan"}}'

systemctl start flannel

Flannel啟動后，將從etcd獲取網絡配置信息

劃分子網并在etcd中注冊

將網絡配置寫入/run/flannel/subnet.env，并通過腳本生成/run/flannel/docker文件

查看etcd注冊信息

修改docker啟動參數

cat /usr/lib/systemd/system/docker.service

EnvironmentFile=/var/run/flannel/docker

ExecStart=/usr/bin/dockerd $DOCKER_NETWORK_OPTIONS

systemctl daemon-reload && systemctl restart docker

查看IP

參考：

https://coreos.com/flannel/docs/latest/running.html#docker-integration

https://coreos.com/flannel/docs/latest/flannel-config.html

https://github.com/etcd-io/etcd