在 k8s 上启用服务拓扑

Question

我正在使用 k8s 和 kubeadm 1.17 版。我正在尝试启用服务拓扑功能门，但我不能。文档说要使用“--feature-gates="ServiceTopology=true,EndpointSlice=true"。我尝试在“kubeadm init”中使用它......但kubeadm说集群不可用。你能帮我吗？这就是我正在关注的文档：https://kubernetes.io/docs/tasks/administer-cluster/enabling-service-topology/

Answer 1

就我而言（kubeadm 版本 1.18.2），它适用于以下 kubeadm 配置 .yaml 文件（podSubnet 在那里，因为我使用的是 Flannel CNI）。 kube-proxy 的 key 是 https://godoc.org/k8s.io/kube-proxy/config/v1alpha1#KubeProxyConfiguration 中提到的“featureGates”

---
apiVersion: kubeadm.k8s.io/v1beta2
kind: ClusterConfiguration
apiServer:
  extraArgs:
    feature-gates: "ServiceTopology=true,EndpointSlice=true"
controllerManager:
  extraArgs:
    feature-gates: "ServiceTopology=true,EndpointSlice=true"
scheduler:
  extraArgs:
    feature-gates: "ServiceTopology=true,EndpointSlice=true"
networking:
   podSubnet: "10.244.0.0/16"

---
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
featureGates:
  ServiceTopology: true
  EndpointSliceProxying: true

Answer 2

这不是 kubeadm 的标志。您需要为每个 kubernetes 控制平面组件启用它，例如控制器管理器、API Server、调度程序、Kube 代理。需要修改所有主节点上位于 /etc/kubernetes/manifests 位置的每个组件的 yaml 以添加功能标志 - --feature-gates=ServiceTopology=true

以 API 服务器 yaml 为例

root@kind-control-plane:/# cat /etc/kubernetes/manifests/kube-apiserver.yaml 
apiVersion: v1
kind: Pod
metadata:
  annotations:
    kubeadm.kubernetes.io/kube-apiserver.advertise-address.endpoint: 172.18.0.2:6443
  creationTimestamp: null
  labels:
    component: kube-apiserver
    tier: control-plane
  name: kube-apiserver
  namespace: kube-system
spec:
  containers:
  - command:
    - kube-apiserver
    - --advertise-address=172.18.0.2
    - --allow-privileged=true
    - --authorization-mode=Node,RBAC
    - --client-ca-file=/etc/kubernetes/pki/ca.crt
    - --enable-admission-plugins=NodeRestriction
    - --enable-bootstrap-token-auth=true
    - --etcd-cafile=/etc/kubernetes/pki/etcd/ca.crt
    - --etcd-certfile=/etc/kubernetes/pki/apiserver-etcd-client.crt
    - --etcd-keyfile=/etc/kubernetes/pki/apiserver-etcd-client.key
    - --etcd-servers=https://127.0.0.1:2379
    - --insecure-port=0
    - --kubelet-client-certificate=/etc/kubernetes/pki/apiserver-kubelet-client.crt
    - --kubelet-client-key=/etc/kubernetes/pki/apiserver-kubelet-client.key
    - --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname
    - --proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.crt
    - --proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client.key
    - --requestheader-allowed-names=front-proxy-client
    - --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.crt
    - --requestheader-extra-headers-prefix=X-Remote-Extra-
    - --requestheader-group-headers=X-Remote-Group
    - --requestheader-username-headers=X-Remote-User
    - --secure-port=6443
    - --service-account-key-file=/etc/kubernetes/pki/sa.pub
    - --service-cluster-ip-range=10.96.0.0/12
    - --tls-cert-file=/etc/kubernetes/pki/apiserver.crt
    - --tls-private-key-file=/etc/kubernetes/pki/apiserver.key
    - --feature-gates=ServiceTopology=true 

编辑：

对于kube proxy，需要创建自定义 kubeadm 配置文件以添加功能标志

apiVersion: kubeadm.k8s.io/v1beta2
kind: ClusterConfiguration
...
---
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
FeatureGates:
  ServiceTopology: true

参考here