calico-node-xxx 0/1 一直起不来，报错 calico/node is not ready: BIRD is not ready: BGP not established with
Calico 默认使用 first-found，也就是从第一个找到的网卡中获取 NodeIP。虽然排除了 lo、docker0 等网卡，但是依然有一定概率会识别失败。需要手动修改，指定网卡。
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| I0916 06:12:44.587396 1 leaderelection.go:185] attempting to acquire leader lease default/cluster.local-nfs-client-nfs-client-provisioner...
E0916 06:12:44.597222 1 event.go:259] Could not construct reference to: '&v1.Endpoints{TypeMeta:v1.TypeMeta{Kind:"", APIVersion:""}, ObjectMeta:v1.ObjectMeta{Name:"cluster.local-nfs-client-nfs-client-provisioner", GenerateName:"", Namespace:"default", SelfLink:"", UID:"bd270086-5338-464b-b50d-b3ec110fc6d1", ResourceVersion:"4413847", Generation:0, CreationTimestamp:v1.Time{Time:time.Time{wall:0x0, ext:63767369564, loc:(*time.Location)(0x1956800)}}, DeletionTimestamp:(*v1.Time)(nil), DeletionGracePeriodSeconds:(*int64)(nil), Labels:map[string]string(nil), Annotations:map[string]string{"control-plane.alpha.kubernetes.io/leader":"{\"holderIdentity\":\"nfs-client-nfs-client-provisioner-5d4fd84f8b-pnwkv_1b60c33d-16b5-11ec-9098-dae3d1cb24d6\",\"leaseDurationSeconds\":15,\"acquireTime\":\"2021-09-16T06:12:44Z\",\"renewTime\":\"2021-09-16T06:12:44Z\",\"leaderTransitions\":0}"}, OwnerReferences:[]v1.OwnerReference(nil), Initializers:(*v1.Initializers)(nil), Finalizers:[]string(nil), ClusterName:""}, Subsets:[]v1.EndpointSubset(nil)}' due to: 'selfLink was empty, can't make reference'. Will not report event: 'Normal' 'LeaderElection' 'nfs-client-nfs-client-provisioner-5d4fd84f8b-pnwkv_1b60c33d-16b5-11ec-9098-dae3d1cb24d6 became leader'
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Kubernetes 1.20 开始, 默认删除了 metadata.selfLink 字段。但是 nfs-client-provisioner 依然使用了该字段。因此, 需要在 kube-apiserver 中开启。
编辑 /etc/kubernetes/manifests/kube-apiserver.yaml , 在启动参数中添加一行 - --feature-gates=RemoveSelfLink=false 即可。
