Docker flannel网络搭建（跨主机通信）

flannel 没有VLAN划分

1、设置hosts (所有主机)
vi /etc/hosts
192.168.118.77 k8smaster
192.168.118.72 k8snode01

service firewalld stop

关闭防火墙后要重启docker

2、开启2379和4001 (所有主机)
firewall-cmd --add-port=2379/tcp --permanent
firewall-cmd --add-port=2380/tcp --permanent
firewall-cmd --add-port=4001/tcp --permanent
firewall-cmd --reload

3、主机安装etcd
yum install etcd -y
cp /etc/etcd/etcd.conf /etc/etcd/etcd.conf.bak

vi /etc/etcd/etcd.conf

[Member]

ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379,http://0.0.0.0:4001"

[Clustering]

ETCD_ADVERTISE_CLIENT_URLS="http://192.168.118.77:2379,http://192.168.118.77:4001"

systemctl start etcd

设置etcd的网络

etcdctl mk /atomic.io/network/config '{"Network":"172.17.0.0/16", "SubnetMin": "172.17.1.0", "SubnetMax": "172.17.254.0"}'

etcdctl -C http://192.168.118.77:4001 cluster-health

4、安装flannel(所有主机)
yum install -y flannel
cp /etc/sysconfig/flanneld /etc/sysconfig/flanneld.bak

vi /etc/sysconfig/flanneld
FLANNEL_ETCD_ENDPOINTS="http://192.168.118.77:2379"

systemctl enable flanneld.service
systemctl start flanneld.service
systemctl restart docker

5、设置DOCKER默认网络，（所有主机，每台的子网不一样，分别设置）
cat /run/flannel/subnet.env
FLANNEL_NETWORK=172.17.0.0/16
FLANNEL_SUBNET=172.17.82.1/24
FLANNEL_MTU=1472
FLANNEL_IPMASQ=false

vi /usr/lib/systemd/system/docker.service
ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock --bip=172.17.50.1/24 --mtu=1472

systemctl daemon-reload
systemctl restart docker