分配给主体的kubectl和see(cluster)角色

时间:2017-04-03 13:57:42

标签: kubernetes kubectl

我可以使用kubectl来查看应用了集群角色的主题,例如:

kubectl get clusterrolebindings system:node --all-namespaces -o json                                                                                                                                                                    
{
    "apiVersion": "rbac.authorization.k8s.io/v1beta1",
    "kind": "ClusterRoleBinding",
     ....
     ....
    "subjects": [
        {
            "apiGroup": "rbac.authorization.k8s.io",
            "kind": "Group",
            "name": "system:nodes"
        }
    ]
}

我想以相反的方式获取此信息,例如:我想列出应用于"系统的所有策略:节点"主题。

我该怎么做?

1 个答案:

答案 0 :(得分:15)

反向索引没有API。您可以查找绑定并筛选包含预期主题的绑定。例如,使用bash,jq和kubectl:

# $1 is kind (User, Group, ServiceAccount)
# $2 is name ("system:nodes", etc)
# $3 is namespace (optional, only applies to kind=ServiceAccount)
function getRoles() {
    local kind="${1}"
    local name="${2}"
    local namespace="${3:-}"

    kubectl get clusterrolebinding -o json | jq -r "
      .items[]
      | 
      select(
        .subjects[]?
        | 
        select(
            .kind == \"${kind}\" 
            and
            .name == \"${name}\"
            and
            (if .namespace then .namespace else \"\" end) == \"${namespace}\"
        )
      )
      |
      (.roleRef.kind + \"/\" + .roleRef.name)
    "
}

$ getRoles Group system:authenticated
ClusterRole/system:basic-user
ClusterRole/system:discovery

$ getRoles ServiceAccount attachdetach-controller kube-system
ClusterRole/system:controller:attachdetach-controller
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