实验案例

1、kubernetes对普通用户授权

RBAC是基于角色的访问控制

创建一个kaka用户来管理namespace=dev的dashboard账户

第一步：在指定namespace创建账户kaka

root@k8s-master01:/apps/k8s-yaml/auth-case# kubectl create namespace dev
namespace/dev created

root@k8s-master01:/apps/k8s-yaml/auth-case# kubectl create serviceaccount kaka -n dev
serviceaccount/kaka created

第二步：创建kaka-role规则

root@k8s-master01:/apps/k8s-yaml/auth-case# kubectl api-resources 
NAME                              SHORTNAMES   APIVERSION                             NAMESPACED   KIND
bindings                                       v1                                     true         Binding
componentstatuses                 cs           v1                                     false        ComponentStatus
configmaps                        cm           v1                                     true         ConfigMap
endpoints                         ep           v1                                     true         Endpoints
events                            ev           v1                                     true         Event
limitranges                       limits       v1                                     true         LimitRange
namespaces                        ns           v1                                     false        Namespace
nodes                             no           v1                                     false        Node
persistentvolumeclaims            pvc          v1                                     true         PersistentVolumeClaim
persistentvolumes                 pv           v1                                     false        PersistentVolume
pods                              po           v1                                     true         Pod
podtemplates                                   v1                                     true         PodTemplate
replicationcontrollers            rc           v1                                     true         ReplicationController
resourcequotas                    quota        v1                                     true         ResourceQuota
secrets                                        v1                                     true         Secret
serviceaccounts                   sa           v1                                     true         ServiceAccount
services                          svc          v1                                     true         Service
mutatingwebhookconfigurations                  admissionregistration.k8s.io/v1        false        MutatingWebhookConfiguration
validatingwebhookconfigurations                admissionregistration.k8s.io/v1        false        ValidatingWebhookConfiguration
customresourcedefinitions         crd,crds     apiextensions.k8s.io/v1                false        CustomResourceDefinition
apiservices                                    apiregistration.k8s.io/v1              false        APIService
controllerrevisions                            apps/v1                                true         ControllerRevision
daemonsets                        ds           apps/v1                                true         DaemonSet
deployments                       deploy       apps/v1                                true         Deployment
replicasets                       rs           apps/v1                                true         ReplicaSet
statefulsets                      sts          apps/v1                                true         StatefulSet
tokenreviews                                   authentication.k8s.io/v1               false        TokenReview
localsubjectaccessreviews                      authorization.k8s.io/v1                true         LocalSubjectAccessReview
selfsubjectaccessreviews                       authorization.k8s.io/v1                false        SelfSubjectAccessReview
selfsubjectrulesreviews                        authorization.k8s.io/v1                false        SelfSubjectRulesReview
subjectaccessreviews                           authorization.k8s.io/v1                false        SubjectAccessReview
horizontalpodautoscalers          hpa          autoscaling/v1                         true         HorizontalPodAutoscaler
cronjobs                          cj           batch/v1                               true         CronJob
jobs                                           batch/v1                               true         Job
certificatesigningrequests        csr          certificates.k8s.io/v1                 false        CertificateSigningRequest
leases                                         coordination.k8s.io/v1                 true         Lease
endpointslices                                 discovery.k8s.io/v1                    true         EndpointSlice
events                            ev           events.k8s.io/v1                       true         Event
ingresses                         ing          extensions/v1beta1                     true         Ingress
flowschemas                                    flowcontrol.apiserver.k8s.io/v1beta1   false        FlowSchema
prioritylevelconfigurations                    flowcontrol.apiserver.k8s.io/v1beta1   false        PriorityLevelConfiguration
nodes                                          metrics.k8s.io/v1beta1                 false        NodeMetrics
pods                                           metrics.k8s.io/v1beta1                 true         PodMetrics
ingressclasses                                 networking.k8s.io/v1                   false        IngressClass
ingresses                         ing          networking.k8s.io/v1                   true         Ingress
networkpolicies                   netpol       networking.k8s.io/v1                   true         NetworkPolicy
runtimeclasses                                 node.k8s.io/v1                         false        RuntimeClass
poddisruptionbudgets              pdb          policy/v1                              true         PodDisruptionBudget
podsecuritypolicies               psp          policy/v1beta1                         false        PodSecurityPolicy
clusterrolebindings                            rbac.authorization.k8s.io/v1           false        ClusterRoleBinding
clusterroles                                   rbac.authorization.k8s.io/v1           false        ClusterRole
rolebindings                                   rbac.authorization.k8s.io/v1           true         RoleBinding
roles                                          rbac.authorization.k8s.io/v1           true         Role
priorityclasses                   pc           scheduling.k8s.io/v1                   false        PriorityClass
csidrivers                                     storage.k8s.io/v1                      false        CSIDriver
csinodes                                       storage.k8s.io/v1                      false        CSINode
csistoragecapacities                           storage.k8s.io/v1beta1                 true         CSIStorageCapacity
storageclasses                    sc           storage.k8s.io/v1                      false        StorageClass
volumeattachments                              storage.k8s.io/v1                      false        VolumeAttachment

kaka-role.yaml

cat >> kaka-role.yaml << EOF
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  namespace: dev
  name: kaka-role
rules:
- apiGroups: ["*"]  #资源的版本信息,"*"表示所有版本
  resources: ["pods","pods/exec"]  #资源信息，pods表示pod资源，pods/exec表示可以进入pod执行命令
  verbs: ["*"] #做什么操作，"*"表示所有操作
  ##RO-Role
  #verbs: ["get", "watch", "list"]
- apiGroups: ["extensions", "apps/v1"]
  resources: ["deployments"]
  verbs: ["get", "list", "watch", "create", "update", "patch", "delete"]
  ##RO-Role
  #verbs: ["get", "watch", "list"]
EOF

root@k8s-master01:/apps/k8s-yaml/auth-case# kubectl apply -f kaka-role.yaml 
role.rbac.authorization.k8s.io/kaka-role created

第三步：将规则与账户进行绑定

cat >> kaka-role-bind.yaml << EOF
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: role-bind-kaka
  namespace: dev
subjects:
- kind: ServiceAccount
  name: kaka
  namespace: dev
roleRef:
  kind: Role
  name: kaka-role
  apiGroup: rbac.authorization.k8s.io
EOF

root@k8s-master01:/apps/k8s-yaml/auth-case# kubectl apply -f kaka-role-bind.yaml 
rolebinding.rbac.authorization.k8s.io/role-bind-kaka created

第四步：获取token名称

root@k8s-master01:/apps/k8s-yaml/auth-case# kubectl get secrets -n dev | grep kaka
kaka-token-mpbwh      kubernetes.io/service-account-token   3      17m


#root@k8s-master01:/apps/k8s-yaml/auth-case# kubectl get secret kaka-token-mpbwh -o jsonpath={.data.token} -n dev |base64 -d
root@k8s-master01:/apps/k8s-yaml/auth-case# kubectl describe secrets kaka-token-mpbwh -n dev
Name:         kaka-token-mpbwh
Namespace:    dev
Labels:       <none>
Annotations:  kubernetes.io/service-account.name: kaka
              kubernetes.io/service-account.uid: 632d6a30-aa82-4145-9504-f0343f6a71f4

Type:  kubernetes.io/service-account-token

Data
====
ca.crt:     1350 bytes
namespace:  3 bytes
token:      eyJhbGciOiJSUzI1NiIsImtpZCI6InYyWDRVcktKczh1WVJBWUlXcWFZQVdWV1l4a2FwMXRGRURrMGV2RUxmaUUifQ.eyJpc3MiOiJrdWJlcm5ldGVzL3NlcnZpY2VhY2NvdW50Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9uYW1lc3BhY2UiOiJkZXYiLCJrdWJlcm5ldGVzLmlvL3NlcnZpY2VhY2NvdW50L3NlY3JldC5uYW1lIjoia2FrYS10b2tlbi1tcGJ3aCIsImt1YmVybmV0ZXMuaW8vc2VydmljZWFjY291bnQvc2VydmljZS1hY2NvdW50Lm5hbWUiOiJrYWthIiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9zZXJ2aWNlLWFjY291bnQudWlkIjoiNjMyZDZhMzAtYWE4Mi00MTQ1LTk1MDQtZjAzNDNmNmE3MWY0Iiwic3ViIjoic3lzdGVtOnNlcnZpY2VhY2NvdW50OmRldjprYWthIn0.AL3k4uILRID6eF3Fp2UVrYT7CpaGxX97kJVJeggZdOyqnawTRpg5fmvGkdjm7TmtoKqhzAFYY5cjKe9YD_m8MxXW1YT7-4sFGuuAjLGzHEKcR3kctzUttOSu0SExHEFGAlsciOvq_TfruAoV4k1vG_5TbN9_BJ6bJTppQ8lI4zjToXM3asmGh_OM-wrV97p-YGSBnWnNQqZ6Mz3Vsw4gTwz7Y1z3q9v5FSByWRnSyoZJZaqI9TaBc3jAJg0DHJ4VFPvO8kdWv9_2eqwQ-VGGcdxCK3VDbtIIs98fj_G_G3Vw6zu4EcNV5BLXYX3Lb8rtiJnvml_GkUmoI_5DF7QOCg

第五步：使用token登录dashboard

原因是kaka用户无获取pods/exec的权限

2、kubernetes对普通用户的认证

基于kube-config文件登录

第六步到第八步在kubernetes的kubeasz部署机上操作，本实验为172.168.33.201

第九步及其之后是在k8s-master01上操作，本实验为172.168.33.207

第六步：创建csr文件

root@harbor:/apps/certs# pwd
/apps/certs

root@harbor:/apps/certs# cat >> kaka-csr.json << EOF
{
  "CN": "China",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "BeiJing",
      "L": "BeiJing",
      "O": "k8s",
      "OU": "System"
    }
  ]
}
EOF

第七步：使用cfssl签发证书

#安装cfssl命令
root@harbor:/etc/kubeasz# apt install golang-cfssl -y
#生成证书
root@harbor:/etc/kubeasz# cfssl gencert -ca=/etc/kubeasz/clusters/k8s-ywx/ssl/ca.pem  -ca-key=//etc/kubeasz/clusters/k8s-ywx/ssl/ca-key.pem -config=/etc/kubeasz/clusters/k8s-ywx/ssl/ca-config.json -profile=kubernetes kaka-csr.json | cfssljson -bare  kaka

root@harbor:/apps/certs# ls
kaka-csr.json  kaka-key.pem  kaka.csr  kaka.pem

第八步：将kaka的证书拷贝到k8s-master节点

root@harbor:/apps/certs# scp -r ./* 172.168.33.207:/etc/kubernetes/ssl/
kaka-csr.json                                                              100%  218   230.1KB/s   00:00    
kaka-key.pem                                                               100% 1679     2.8MB/s   00:00    
kaka.csr                                                                   100%  993     1.2MB/s   00:00    
kaka.pem                                                                   100% 1383     2.3MB/s   00:00

第九步：生成普通用户kaka的kubeconfig文件

root@k8s-master01:/etc/kubernetes/ssl# kubectl config set-cluster k8s-ywx --certificate-authority=/etc/kubernetes/ssl/ca.pem --embed-certs=true --server=https://172.168.33.50:6443 --kubeconfig=kaka.kubeconfig 
#--embed-certs=true 为嵌入证书信息

第十步：设置客户端认证参数

root@k8s-master01:/etc/kubernetes/ssl# kubectl config set-credentials kaka 
--client-certificate=/etc/kubernetes/ssl/kaka.pem 
--client-key=/etc/kubernetes/ssl/kaka-key.pem 
--embed-certs=true 
--kubeconfig=kaka.kubeconfig

第十一步：设置上下文参数(多集群使用上下文区分)

https://kubernetes.io/zh/docs/concepts/configuration/organize-cluster-access-kubeconfig/

root@k8s-master01:/etc/kubernetes/ssl# kubectl config set-context k8s-ywx 
--cluster=k8s-ywx 
--user=kaka 
--namespace=dev 
--kubeconfig=kaka.kubeconfig

第十二步：设置默认上下文

root@k8s-master01:/etc/kubernetes/ssl# kubectl config use-context k8s-ywx --kubeconfig=kaka.kubeconfig

第十三步：将第四步中获取的token值写入kaka.kubeconfig的最后

root@k8s-master01:/etc/kubernetes/ssl# vim kaka.kubeconfig 

  name: k8s-ywx
contexts:
- context:
    cluster: k8s-ywx
    namespace: dev
    user: kaka
  name: k8s-ywx
current-context: k8s-ywx
kind: Config
preferences: {}
users:
- name: kaka
  user:
    client-certificate-data: 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
    client-key-data: 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
    token: eyJhbGciOiJSUzI1NiIsImtpZCI6InYyWDRVcktKczh1WVJBWUlXcWFZQVdWV1l4a2FwMXRGRURrMGV2RUxmaUUifQ.eyJpc3MiOiJrdWJlcm5ldGVzL3NlcnZpY2VhY2NvdW50Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9uYW1lc3BhY2UiOiJkZXYiLCJrdWJlcm5ldGVzLmlvL3NlcnZpY2VhY2NvdW50L3NlY3JldC5uYW1lIjoia2FrYS10b2tlbi1tcGJ3aCIsImt1YmVybmV0ZXMuaW8vc2VydmljZWFjY291bnQvc2VydmljZS1hY2NvdW50Lm5hbWUiOiJrYWthIiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9zZXJ2aWNlLWFjY291bnQudWlkIjoiNjMyZDZhMzAtYWE4Mi00MTQ1LTk1MDQtZjAzNDNmNmE3MWY0Iiwic3ViIjoic3lzdGVtOnNlcnZpY2VhY2NvdW50OmRldjprYWthIn0.AL3k4uILRID6eF3Fp2UVrYT7CpaGxX97kJVJeggZdOyqnawTRpg5fmvGkdjm7TmtoKqhzAFYY5cjKe9YD_m8MxXW1YT7-4sFGuuAjLGzHEKcR3kctzUttOSu0SExHEFGAlsciOvq_TfruAoV4k1vG_5TbN9_BJ6bJTppQ8lI4zjToXM3asmGh_OM-wrV97p-YGSBnWnNQqZ6Mz3Vsw4gTwz7Y1z3q9v5FSByWRnSyoZJZaqI9TaBc3jAJg0DHJ4VFPvO8kdWv9_2eqwQ-VGGcdxCK3VDbtIIs98fj_G_G3Vw6zu4EcNV5BLXYX3Lb8rtiJnvml_GkUmoI_5DF7QOCg

第十四步：使用kaka.kubeconfig登录dashboard并测试

I have a dream so I study hard!!!