rancher v2.8.1 如何成功注册已有 k8s 集群

需要加入的集群为rke2部署的双节点集群

$ kubectl get node
NAME           STATUS   ROLES                              AGE   VERSION
rke-master01   Ready    control-plane,etcd,master,worker   94d   v1.26.8+rke2r1
rke-master02   Ready    control-plane,etcd,master,worker   93d   v1.26.8+rke2r1

登陆 rancher

注意：直接执行截图中的命令，不要改动yaml内容。当执行完后注册集群的agent会报错，随后，我们通过
kubectl edit deploy cattle-cluster-agent -n cattle-system命令添加hostAlias,其他方式会注册失败，例如：先修改yaml再apply执行。

格式如下：

      hostAliases:- hostnames:- rancher02.demo.comip: 192.168.23.80

完整内容：

---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:name: proxy-clusterrole-kubeapiserver
rules:
- apiGroups: [""]resources:- nodes/metrics- nodes/proxy- nodes/stats- nodes/log- nodes/specverbs: ["get", "list", "watch", "create"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:name: proxy-role-binding-kubernetes-master
roleRef:apiGroup: rbac.authorization.k8s.iokind: ClusterRolename: proxy-clusterrole-kubeapiserver
subjects:
- apiGroup: rbac.authorization.k8s.iokind: Username: kube-apiserver
---
apiVersion: v1
kind: Namespace
metadata:name: cattle-system---apiVersion: v1
kind: ServiceAccount
metadata:name: cattlenamespace: cattle-system---apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:name: cattle-admin-bindingnamespace: cattle-systemlabels:cattle.io/creator: "norman"
subjects:
- kind: ServiceAccountname: cattlenamespace: cattle-system
roleRef:kind: ClusterRolename: cattle-adminapiGroup: rbac.authorization.k8s.io---apiVersion: v1
kind: Secret
metadata:name: cattle-credentials-535d46anamespace: cattle-system
type: Opaque
data:url: "aHR0cHM6Ly9yYW5jaGVyMDIuZGVtby5jb20="token: "Z2hwZmJkbHBzbTk1NTJ4cXZuYmQ3NW5yOXA1N3d0ZnN4bGJ2dDd6cmwyY3Zwc3BxbGc5NWY1"namespace: ""---apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:name: cattle-adminlabels:cattle.io/creator: "norman"
rules:
- apiGroups:- '*'resources:- '*'verbs:- '*'
- nonResourceURLs:- '*'verbs:- '*'---apiVersion: apps/v1
kind: Deployment
metadata:name: cattle-cluster-agentnamespace: cattle-systemannotations:management.cattle.io/scale-available: "2"
spec:selector:matchLabels:app: cattle-cluster-agenttemplate:metadata:labels:app: cattle-cluster-agentspec:affinity:nodeAffinity:preferredDuringSchedulingIgnoredDuringExecution:- preference:matchExpressions:- key: node-role.kubernetes.io/controlplaneoperator: Invalues:- "true"weight: 100- preference:matchExpressions:- key: node-role.kubernetes.io/control-planeoperator: Invalues:- "true"weight: 100- preference:matchExpressions:- key: node-role.kubernetes.io/masteroperator: Invalues:- "true"weight: 100- preference:matchExpressions:- key: cattle.io/cluster-agentoperator: Invalues:- "true"weight: 1requiredDuringSchedulingIgnoredDuringExecution:nodeSelectorTerms:- matchExpressions:- key: beta.kubernetes.io/osoperator: NotInvalues:- windowspodAntiAffinity:preferredDuringSchedulingIgnoredDuringExecution:- podAffinityTerm:labelSelector:matchExpressions:- key: appoperator: Invalues:- cattle-cluster-agenttopologyKey: kubernetes.io/hostnameweight: 100serviceAccountName: cattlehostAliases:- hostnames:- rancher02.demo.comip: 192.168.23.80tolerations:# No taints or no controlplane nodes found, added defaults- effect: NoSchedulekey: node-role.kubernetes.io/controlplanevalue: "true"- effect: NoSchedulekey: "node-role.kubernetes.io/control-plane"operator: "Exists"- effect: NoSchedulekey: "node-role.kubernetes.io/master"operator: "Exists"containers:- name: cluster-registerimagePullPolicy: IfNotPresentenv:- name: CATTLE_IS_RKEvalue: "false"- name: CATTLE_SERVERvalue: "https://rancher02.demo.com"- name: CATTLE_CA_CHECKSUMvalue: "d818528e6c91a42ed9573c1cbe4b6e3df067d3ebca8b57efccb8e463306e3760"- name: CATTLE_CLUSTERvalue: "true"- name: CATTLE_K8S_MANAGEDvalue: "true"- name: CATTLE_CLUSTER_REGISTRYvalue: ""- name: CATTLE_SERVER_VERSIONvalue: v2.8.1- name: CATTLE_INSTALL_UUIDvalue: 26c8f3d4-ad4d-4412-87e6-2f4ecb3ce63c- name: CATTLE_INGRESS_IP_DOMAINvalue: sslip.ioimage: rancher/rancher-agent:v2.8.1volumeMounts:- name: cattle-credentialsmountPath: /cattle-credentialsreadOnly: truevolumes:- name: cattle-credentialssecret:secretName: cattle-credentials-535d46adefaultMode: 320strategy:type: RollingUpdaterollingUpdate:maxUnavailable: 0maxSurge: 1---
apiVersion: v1
kind: Service
metadata:name: cattle-cluster-agentnamespace: cattle-system
spec:ports:- port: 80targetPort: 80protocol: TCPname: http- port: 443targetPort: 444protocol: TCPname: https-internalselector:app: cattle-cluster-agent

注册成功。如图：