同一个 ServiceAccount 管理指定的多个 NameSpace 中的资源
- 普通情况下是：
- ServiceAccount 通过 RoleBinding 与所在 namespace 中的 Role 进行绑定，获取所在 namespace 中的资源权限
- ServiceAccount 通过 ClusterRoleBinding 与 ClusterRole 进行绑定，获取集群内的资源权限（不限定 namespace ）
-
而实现”同一个 ServiceAccount 获取指定的多个 NameSpace 中的资源权限“的做法是：
-
同一个 ServiceAccount 通过 RoleBinding 在不同的 namespace 中绑定 ClusterRole，从而获取该 namespace 中的资源权限
-
ClusterRole 可以是同一个 ClusterRole，也可以是不同的 ClusterRole
-
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
apiVersion: v1
kind: ServiceAccount
metadata:
name: fdr-developer
namespace: default
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: developer
rules:
- apiGroups: [""]
resources: ["pods"]
verbs: ["create", "delete", "get", "list", "patch", "update", "watch"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding # 注意这里不是 ClusterRoleBinding
metadata:
name: fdr-developer-dev-fdr
namespace: dev-fdr # ServiceAccount[fdr-developer] 在 namespace[dev-fdr] 内具有 ClusterRole[developer] 定义的权限
subjects:
- kind: ServiceAccount
name: fdr-developer
namespace: default
roleRef:
kind: ClusterRole # 这里是 ClusterRole
name: developer
apiGroup: rbac.authorization.k8s.io
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: fdr-developer-stag-fdr
namespace: stag-fdr
subjects:
- kind: ServiceAccount
name: fdr-developer
namespace: default
roleRef:
kind: ClusterRole
name: developer
apiGroup: rbac.authorization.k8s.io
- 验证
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
apiVersion: v1
kind: Pod
metadata:
name: pod-auth-test
namespace: default
spec:
serviceAccountName: fdr-developer
containers:
- name: pod-auth-test
image: alpine:3.16
imagePullPolicy: IfNotPresent
command: ["sh","-c","sleep 3600"]
volumeMounts:
- name: kubectl
mountPath: /usr/bin/kubectl
readOnly: true
volumes:
- name: kubectl
hostPath:
path: /usr/bin/kubectl
1
2
3
4
5
6
7
8
9
10
[root@k8s-master1 ~]# kubectl exec -it pod-auth-test -- sh
/ # kubectl get po -n dev-fdr
No resources found in dev-fdr namespace.
/ # kubectl get po -n stag-fdr
No resources found in stag-fdr namespace.
/ # kubectl get po -n devops
Error from server (Forbidden): pods is forbidden: User "system:serviceaccount:default:fdr-developer" cannot list resource "pods" in API group "" in the namespace "devops"
/ # kubectl get po
Error from server (Forbidden): pods is forbidden: User "system:serviceaccount:default:fdr-developer" cannot list resource "pods" in API group "" in the namespace "default"
/ #
