update Flannel (0.25.3)

[AkihiroSuda]

Now kube-flannel fails on restarting a node: error looking up interface 192.168.60.11: No interface with given IP found

$ make up kubeadm-init install-flannel kubeconfig
$ export KUBECONFIG=$(pwd)/kubeconfig
$ make down
$ make up
$ kubectl logs -n kube-flannel kube-flannel-ds-hrqt4 
Defaulted container "kube-flannel" out of: kube-flannel, install-cni-plugin (init), install-cni (init)
I0527 02:14:04.874324       1 main.go:211] CLI flags config: {etcdEndpoints:http://127.0.0.1:4001,http://127.0.0.1:2379 etcdPrefix:/coreos.com/network etcdKeyfile: etcdCertfile: etcdCAFile: etcdUsername: etcdPassword: version:false kubeSubnetMgr:true kubeApiUrl: kubeAnnotationPrefix:flannel.alpha.coreos.com kubeConfigFile: iface:[] ifaceRegex:[] ipMasq:true ifaceCanReach: subnetFile:/run/flannel/subnet.env publicIP: publicIPv6: subnetLeaseRenewMargin:60 healthzIP:0.0.0.0 healthzPort:0 iptablesResyncSeconds:5 iptablesForwardRules:true netConfPath:/etc/kube-flannel/net-conf.json setNodeNetworkUnavailable:true}
W0527 02:14:04.874476       1 client_config.go:618] Neither --kubeconfig nor --master was specified.  Using the inClusterConfig.  This might not work.
I0527 02:14:04.897430       1 kube.go:139] Waiting 10m0s for node controller to sync
I0527 02:14:04.897737       1 kube.go:455] Starting kube subnet manager
I0527 02:14:04.902721       1 kube.go:476] Creating the node lease for IPv4. This is the n.Spec.PodCIDRs: [10.244.0.0/24]
I0527 02:14:05.899116       1 kube.go:146] Node controller sync successful
I0527 02:14:05.899197       1 main.go:231] Created subnet manager: Kubernetes Subnet Manager - u7s-suda-ws01
I0527 02:14:05.899211       1 main.go:234] Installing signal handlers
I0527 02:14:05.900566       1 main.go:452] Found network config - Backend type: vxlan
I0527 02:14:05.908250       1 kube.go:655] List of node(u7s-suda-ws01) annotations: map[string]string{"flannel.alpha.coreos.com/backend-data":"{\"VNI\":1,\"VtepMAC\":\"b2:ad:96:1b:27:b2\"}", "flannel.alpha.coreos.com/backend-type":"vxlan", "flannel.alpha.coreos.com/kube-subnet-manager":"true", "flannel.alpha.coreos.com/public-ip":"192.168.60.11", "flannel.alpha.coreos.com/public-ip-overwrite":"192.168.60.11", "kubeadm.alpha.kubernetes.io/cri-socket":"unix:///var/run/containerd/containerd.sock", "node.alpha.kubernetes.io/ttl":"0", "volumes.kubernetes.io/controller-managed-attach-detach":"true"}
I0527 02:14:05.908335       1 match.go:74] Searching for interface using 192.168.60.11
E0527 02:14:05.908814       1 main.go:287] Failed to find any valid interface to use: error looking up interface 192.168.60.11: No interface with given IP found

• https://github.com/flannel-io/flannel/issues/1978