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k8s之Flannel网络插件安装提示forbidden无权限

article 2024/9/26 3:30:29

在这里插入图片描述

一、问题描述

在安装k8s的网络插件时，提示如下信息，各种forbidden无权限

[root@zzyk8s01 scripts]# kubectl apply -f kube-flannel.yml 
Error from server (Forbidden): error when retrieving current configuration of:
Resource: "policy/v1beta1, Resource=podsecuritypolicies", GroupVersionKind: "policy/v1beta1, Kind=PodSecurityPolicy"
Name: "psp.flannel.unprivileged", Namespace: ""
from server for: "kube-flannel.yml": podsecuritypolicies.policy "psp.flannel.unprivileged" is forbidden: User "system:node:zzyk8s01" cannot get resource "podsecuritypolicies" in API group "policy" at the cluster scope
Error from server (Forbidden): error when retrieving current configuration of:
Resource: "rbac.authorization.k8s.io/v1, Resource=clusterroles", GroupVersionKind: "rbac.authorization.k8s.io/v1, Kind=ClusterRole"
Name: "flannel", Namespace: ""
from server for: "kube-flannel.yml": clusterroles.rbac.authorization.k8s.io "flannel" is forbidden: User "system:node:zzyk8s01" cannot get resource "clusterroles" in API group "rbac.authorization.k8s.io" at the cluster scope
Error from server (Forbidden): error when retrieving current configuration of:
Resource: "rbac.authorization.k8s.io/v1, Resource=clusterrolebindings", GroupVersionKind: "rbac.authorization.k8s.io/v1, Kind=ClusterRoleBinding"
Name: "flannel", Namespace: ""
from server for: "kube-flannel.yml": clusterrolebindings.rbac.authorization.k8s.io "flannel" is forbidden: User "system:node:zzyk8s01" cannot get resource "clusterrolebindings" in API group "rbac.authorization.k8s.io" at the cluster scope
Error from server (Forbidden): error when retrieving current configuration of:
Resource: "/v1, Resource=serviceaccounts", GroupVersionKind: "/v1, Kind=ServiceAccount"
Name: "flannel", Namespace: "kube-system"
from server for: "kube-flannel.yml": serviceaccounts "flannel" is forbidden: User "system:node:zzyk8s01" cannot get resource "serviceaccounts" in API group "" in the namespace "kube-system": can only create tokens for individual service accounts
Error from server (Forbidden): error when retrieving current configuration of:
Resource: "/v1, Resource=configmaps", GroupVersionKind: "/v1, Kind=ConfigMap"
Name: "kube-flannel-cfg", Namespace: "kube-system"
from server for: "kube-flannel.yml": configmaps "kube-flannel-cfg" is forbidden: User "system:node:zzyk8s01" cannot get resource "configmaps" in API group "" in the namespace "kube-system": no relationship found between node 'zzyk8s01' and this object
Error from server (Forbidden): error when retrieving current configuration of:
Resource: "apps/v1, Resource=daemonsets", GroupVersionKind: "apps/v1, Kind=DaemonSet"
Name: "kube-flannel-ds", Namespace: "kube-system"
from server for: "kube-flannel.yml": daemonsets.apps "kube-flannel-ds" is forbidden: User "system:node:zzyk8s01" cannot get resource "daemonsets" in API group "apps" in the namespace "kube-system"
[root@zzyk8s01 scripts]#

二、解决方法

这可能是由于config没有更新导致的，/root/.kube/config是从/etc/kubernetes/admin.conf复制而来。复制来之后，是需要执行更新kubeconfig命令的。

2.1 更新 kubeconfig 命令：

export KUBECONFIG=/root/.kube/config
chmod g-r /root/.kube/config

2.2 再次执行安装flannel的命令

提示各种OK

[root@zzyk8s01 scripts]# kubectl apply -f kube-flannel.yml            
Warning: policy/v1beta1 PodSecurityPolicy is deprecated in v1.21+, unavailable in v1.25+
podsecuritypolicy.policy/psp.flannel.unprivileged created
clusterrole.rbac.authorization.k8s.io/flannel created
clusterrolebinding.rbac.authorization.k8s.io/flannel created
serviceaccount/flannel created
configmap/kube-flannel-cfg created
daemonset.apps/kube-flannel-ds created

2.3 查看flannel的运行情况

显示各种Running

[root@zzyk8s01 scripts]# kubectl get pods -n kube-system
NAME                               READY   STATUS    RESTARTS   AGE
coredns-78fcd69978-vlzpd           1/1     Running   0          2d16h
coredns-78fcd69978-vmtdm           1/1     Running   0          2d16h
etcd-zzyk8s01                      1/1     Running   1          2d16h
kube-apiserver-zzyk8s01            1/1     Running   1          2d16h
kube-controller-manager-zzyk8s01   1/1     Running   2          2d16h
kube-flannel-ds-fpzm9              1/1     Running   0          36s
kube-flannel-ds-gkgnz              1/1     Running   0          36s
kube-flannel-ds-tmb5s              1/1     Running   0          36s
kube-proxy-2gxv9                   1/1     Running   0          2d16h
kube-proxy-h2zdl                   1/1     Running   0          2d16h
kube-proxy-v6drm                   1/1     Running   1          2d16h
kube-scheduler-zzyk8s01            1/1     Running   2          2d16h

2.4 查看flannel网络情况

如下图，cni0和flannel.1网络都UP状态在这里插入图片描述

三、附上 `kube-flannel.yml`的文件

---
apiVersion: policy/v1beta1
kind: PodSecurityPolicy
metadata:
  name: psp.flannel.unprivileged
  annotations:
    seccomp.security.alpha.kubernetes.io/allowedProfileNames: docker/default
    seccomp.security.alpha.kubernetes.io/defaultProfileName: docker/default
    apparmor.security.beta.kubernetes.io/allowedProfileNames: runtime/default
    apparmor.security.beta.kubernetes.io/defaultProfileName: runtime/default
spec:
  privileged: false
  volumes:
  - configMap
  - secret
  - emptyDir
  - hostPath
  allowedHostPaths:
  - pathPrefix: "/etc/cni/net.d"
  - pathPrefix: "/etc/kube-flannel"
  - pathPrefix: "/run/flannel"
  readOnlyRootFilesystem: false
  # Users and groups
  runAsUser:
    rule: RunAsAny
  supplementalGroups:
    rule: RunAsAny
  fsGroup:
    rule: RunAsAny
  # Privilege Escalation
  allowPrivilegeEscalation: false
  defaultAllowPrivilegeEscalation: false
  # Capabilities
  allowedCapabilities: ['NET_ADMIN', 'NET_RAW']
  defaultAddCapabilities: []
  requiredDropCapabilities: []
  # Host namespaces
  hostPID: false
  hostIPC: false
  hostNetwork: true
  hostPorts:
  - min: 0
    max: 65535
  # SELinux
  seLinux:
    # SELinux is unused in CaaSP
    rule: 'RunAsAny'
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: flannel
rules:
- apiGroups: ['extensions']
  resources: ['podsecuritypolicies']
  verbs: ['use']
  resourceNames: ['psp.flannel.unprivileged']
- apiGroups:
  - ""
  resources:
  - pods
  verbs:
  - get
- apiGroups:
  - ""
  resources:
  - nodes
  verbs:
  - list
  - watch
- apiGroups:
  - ""
  resources:
  - nodes/status
  verbs:
  - patch
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: flannel
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: flannel
subjects:
- kind: ServiceAccount
  name: flannel
  namespace: kube-system
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: flannel
  namespace: kube-system
---
kind: ConfigMap
apiVersion: v1
metadata:
  name: kube-flannel-cfg
  namespace: kube-system
  labels:
    tier: node
    app: flannel
data:
  cni-conf.json: |
    {
      "name": "cbr0",
      "cniVersion": "0.3.1",
      "plugins": [
        {
          "type": "flannel",
          "delegate": {
            "hairpinMode": true,
            "isDefaultGateway": true
          }
        },
        {
          "type": "portmap",
          "capabilities": {
            "portMappings": true
          }
        }
      ]
    }
  net-conf.json: |
    {
      "Network": "10.244.0.0/16",
      "Backend": {
        "Type": "vxlan"
      }
    }
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: kube-flannel-ds
  namespace: kube-system
  labels:
    tier: node
    app: flannel
spec:
  selector:
    matchLabels:
      app: flannel
  template:
    metadata:
      labels:
        tier: node
        app: flannel
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: kubernetes.io/os
                operator: In
                values:
                - linux
      hostNetwork: true
      priorityClassName: system-node-critical
      tolerations:
      - operator: Exists
        effect: NoSchedule
      serviceAccountName: flannel
      initContainers:
      - name: install-cni
        image: jmgao1983/flannel #quay.io/coreos/flannel:v0.13.1-rc2
        command:
        - cp
        args:
        - -f
        - /etc/kube-flannel/cni-conf.json
        - /etc/cni/net.d/10-flannel.conflist
        volumeMounts:
        - name: cni
          mountPath: /etc/cni/net.d
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
      containers:
      - name: kube-flannel
        image: jmgao1983/flannel #quay.io/coreos/flannel:v0.13.1-rc2
        command:
        - /opt/bin/flanneld
        args:
        - --ip-masq
        - --kube-subnet-mgr
        resources:
          requests:
            cpu: "100m"
            memory: "50Mi"
          limits:
            cpu: "100m"
            memory: "50Mi"
        securityContext:
          privileged: false
          capabilities:
            add: ["NET_ADMIN", "NET_RAW"]
        env:
        - name: POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: POD_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        volumeMounts:
        - name: run
          mountPath: /run/flannel
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
      volumes:
      - name: run
        hostPath:
          path: /run/flannel
      - name: cni
        hostPath:
          path: /etc/cni/net.d
      - name: flannel-cfg
        configMap:
          name: kube-flannel-cfg