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 2d16h2.4 查看flannel网络情况
如下图，cni0和flannel.1网络都UP状态
三、附上 kube-flannel.yml的文件
---
apiVersion: policy/v1beta1
kind: PodSecurityPolicy
metadata:name: psp.flannel.unprivilegedannotations:seccomp.security.alpha.kubernetes.io/allowedProfileNames: docker/defaultseccomp.security.alpha.kubernetes.io/defaultProfileName: docker/defaultapparmor.security.beta.kubernetes.io/allowedProfileNames: runtime/defaultapparmor.security.beta.kubernetes.io/defaultProfileName: runtime/default
spec:privileged: falsevolumes:- configMap- secret- emptyDir- hostPathallowedHostPaths:- pathPrefix: "/etc/cni/net.d"- pathPrefix: "/etc/kube-flannel"- pathPrefix: "/run/flannel"readOnlyRootFilesystem: false# Users and groupsrunAsUser:rule: RunAsAnysupplementalGroups:rule: RunAsAnyfsGroup:rule: RunAsAny# Privilege EscalationallowPrivilegeEscalation: falsedefaultAllowPrivilegeEscalation: false# CapabilitiesallowedCapabilities: ['NET_ADMIN', 'NET_RAW']defaultAddCapabilities: []requiredDropCapabilities: []# Host namespaceshostPID: falsehostIPC: falsehostNetwork: truehostPorts:- min: 0max: 65535# SELinuxseLinux:# SELinux is unused in CaaSPrule: '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:- podsverbs:- get
- apiGroups:- ""resources:- nodesverbs:- list- watch
- apiGroups:- ""resources:- nodes/statusverbs:- patch
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:name: flannel
roleRef:apiGroup: rbac.authorization.k8s.iokind: ClusterRolename: flannel
subjects:
- kind: ServiceAccountname: flannelnamespace: kube-system
---
apiVersion: v1
kind: ServiceAccount
metadata:name: flannelnamespace: kube-system
---
kind: ConfigMap
apiVersion: v1
metadata:name: kube-flannel-cfgnamespace: kube-systemlabels:tier: nodeapp: 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-dsnamespace: kube-systemlabels:tier: nodeapp: flannel
spec:selector:matchLabels:app: flanneltemplate:metadata:labels:tier: nodeapp: flannelspec:affinity:nodeAffinity:requiredDuringSchedulingIgnoredDuringExecution:nodeSelectorTerms:- matchExpressions:- key: kubernetes.io/osoperator: Invalues:- linuxhostNetwork: truepriorityClassName: system-node-criticaltolerations:- operator: Existseffect: NoScheduleserviceAccountName: flannelinitContainers:- name: install-cniimage: jmgao1983/flannel #quay.io/coreos/flannel:v0.13.1-rc2command:- cpargs:- -f- /etc/kube-flannel/cni-conf.json- /etc/cni/net.d/10-flannel.conflistvolumeMounts:- name: cnimountPath: /etc/cni/net.d- name: flannel-cfgmountPath: /etc/kube-flannel/containers:- name: kube-flannelimage: jmgao1983/flannel #quay.io/coreos/flannel:v0.13.1-rc2command:- /opt/bin/flanneldargs:- --ip-masq- --kube-subnet-mgrresources:requests:cpu: "100m"memory: "50Mi"limits:cpu: "100m"memory: "50Mi"securityContext:privileged: falsecapabilities:add: ["NET_ADMIN", "NET_RAW"]env:- name: POD_NAMEvalueFrom:fieldRef:fieldPath: metadata.name- name: POD_NAMESPACEvalueFrom:fieldRef:fieldPath: metadata.namespacevolumeMounts:- name: runmountPath: /run/flannel- name: flannel-cfgmountPath: /etc/kube-flannel/volumes:- name: runhostPath:path: /run/flannel- name: cnihostPath:path: /etc/cni/net.d- name: flannel-cfgconfigMap:name: kube-flannel-cfg
