Question

我需要从启用RBAC的集群中同一命名空间中的另一个Pod调用Kubernetes作业。使用C＃Kubernetes client library创建作业。此任务在未启用RBAC的测试环境中可以正常工作。

遵循Kubernetes documentation创建服务帐户后，我具有以下YAML。

apiVersion: v1
kind: ServiceAccount
metadata:
  name: x20-jobs-sp
  namespace: prod
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  namespace: prod
  name: x20-jobs-sp-role
rules:
- apiGroups: [""]
  resources: ["pods"]
  verbs: ["get", "list", "watch", "create", "update", "patch", "delete"]
- apiGroups: ["batch", "extensions"]
  resources: ["jobs"]
  verbs: ["get", "list", "watch", "create", "update", "patch", "delete"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: x20-jobs-sp-rolebinding
  namespace: prod
subjects:
  - kind: ServiceAccount
    # Reference to ServiceAccount kind's `metadata.name`
    name: x20-jobs-sp
    # Reference to ServiceAccount kind's `metadata.namespace`
    namespace: prod
roleRef:
  kind: ClusterRole
  name: x20-jobs-sp-role
  apiGroup: rbac.authorization.k8s.io

这是调用作业的代码。

var job = await client.CreateNamespacedJobAsync(new k8s.Models.V1Job
{
    Metadata = new k8s.Models.V1ObjectMeta
    {
        Name = safeName
    },
    Spec = new k8s.Models.V1JobSpec
    {
        Template = new k8s.Models.V1PodTemplateSpec
        {
            Spec = new k8s.Models.V1PodSpec
            {
                Containers = new List<k8s.Models.V1Container>()
                {
                    new k8s.Models.V1Container
                    {
                        Image = $"{_containerRegistry}/{jobName}:{_imageTag}",
                        Args = args.Select(x => x.ToString()).ToList(),
                        Env = GetDefaultEnvironment(),
                        Name = safeName,
                        ImagePullPolicy = "Always"  
                    }
                },
                ImagePullSecrets = new List<k8s.Models.V1LocalObjectReference>
                {
                    new k8s.Models.V1LocalObjectReference
                    {
                        Name = _containerRegistry
                    }
                },
                RestartPolicy = "OnFailure", 
                ServiceAccountName = "x20-jobs-sp" // jobs service principal
            }
        },
        TtlSecondsAfterFinished = _ttlSecondsAfterFinished
    }
}, _namespace);

此正确创建的是ServiceAccount，ClusterRole和ClusterRoleBinding，但是尝试调用任务仍然会导致Forbidden结果。

我已经为ClusterRole尝试了许多不同的选项，包括使用内置的cluster-admin角色，但都没有成功。已经使用kubectl auth can-i命令对此进行了测试。

我想念什么？

Answer 1

因此，原来的原因是试图调用作业的pod的默认服务帐户没有必要的角色绑定。
我通过将cluster-admin RoleBinding添加到命名空间中的默认服务帐户并调用该作业来进行了测试。
kubectl create clusterrolebinding --user system:serviceaccount:prod:default prod-cluster-admin --clusterrole cluster-admin

Kubernetes作业服务帐号

1 个答案: