已创建 k8s 卷快照，但它在 python k8s 客户端中返回 409 错误消息

Question

我使用 python k8s 客户端成功地对我的卷进行了快照。

但是，我收到了以下消息。

我在集群中没有相同的volumesnapshot。

为什么会这样？

代码：

def create_snapshot（命名空间，pvc_name）：

snapshot_class = "snapshotclass"
snapshot_name = f"snapshot-{pvc_name}"

snapshot_resource = {
"apiVersion": "snapshot.storage.k8s.io/v1beta1",
"kind": "VolumeSnapshot",
"metadata": {"name": snapshot_name},
"spec": {
    "volumeSnapshotClassName": snapshot_class,
    "source": {"persistentVolumeClaimName": pvc_name}
    }
}

res = custom_api.create_namespaced_custom_object(
    group="snapshot.storage.k8s.io",
    version="v1beta1",
    namespace= namespace,
    plural="volumesnapshots",
    body=snapshot_resource,
)

print(res)

create_snapshot("test", "test-pvc")

卷快照创建成功，但我收到一条消息：

  File "/home/new/my/test/rescheduler/utils/k8s_controller.py", line 72, in create_snapshot
    body=snapshot_resource,
  File "/home/new/my/test/venv/lib/python3.6/site-packages/kubernetes/client/api/custom_objects_api.py", line 225, in create_namespaced_custom_object
    return self.create_namespaced_custom_object_with_http_info(group, version, namespace, plural, body, **kwargs)  # noqa: E501
  File "/home/new/my/test/venv/lib/python3.6/site-packages/kubernetes/client/api/custom_objects_api.py", line 358, in create_namespaced_custom_object_with_http_info
    collection_formats=collection_formats)
  File "/home/new/my/test/venv/lib/python3.6/site-packages/kubernetes/client/api_client.py", line 353, in call_api
    _preload_content, _request_timeout, _host)
  File "/home/new/my/test/venv/lib/python3.6/site-packages/kubernetes/client/api_client.py", line 184, in __call_api
    _request_timeout=_request_timeout)
  File "/home/new/my/test/venv/lib/python3.6/site-packages/kubernetes/client/api_client.py", line 397, in request
    body=body)
  File "/home/new/my/test/venv/lib/python3.6/site-packages/kubernetes/client/rest.py", line 280, in POST
    body=body)
  File "/home/new/my/test/venv/lib/python3.6/site-packages/kubernetes/client/rest.py", line 233, in request
    raise ApiException(http_resp=r)
kubernetes.client.exceptions.ApiException: (409)
Reason: Conflict
HTTP response headers: HTTPHeaderDict({'Audit-Id': 'dec3c73a-e5fc-4c63-8d1a-6e2e6c6600e1', 'Cache-Control': 'no-cache, private', 'Content-Type': 'application/json', 'Date': 'my, 25 Apr 2021 10:50:52 GMT', 'Content-Length': '346'})
HTTP response body: {"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"volumesnapshots.snapshot.storage.k8s.io \"snapshot-test-pvc\" already exists","reason":"AlreadyExists","details":{"name":"snapshot-test-pvc,"group":"snapshot.storage.k8s.io","kind":"volumesnapshots"},"code":409}

Answer 1

将此答案发布为社区 wiki，以提供在尝试使用上述代码片段创建资源时遇到错误409的可能原因之一。

随意扩展它。

---

问题中遇到的错误：

Reason: Conflict
HTTP response headers: HTTPHeaderDict({'Audit-Id': 'dec3c73a-e5fc-4c63-8d1a-6e2e6c6600e1', 'Cache-Control': 'no-cache, private', 'Content-Type': 'application/json', 'Date': 'my, 25 Apr 2021 10:50:52 GMT', 'Content-Length': '346'})
HTTP response body: {"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"volumesnapshots.snapshot.storage.k8s.io \"snapshot-test-pvc\" already exists","reason":"AlreadyExists","details":{"name":"snapshot-test-pvc,"group":"snapshot.storage.k8s.io","kind":"volumesnapshots"},"code":409}

"snapshot-test-pvc\" already exists","reason":"AlreadyExists"

表示资源已存在于集群中。 要检查资源是否存在于集群中，您可以运行以下命令：

• $ kubectl get volumesnapshots -A
• $ kubectl describe volumesnapshots RESOURCE_NAME -A

我已经使用了问题中的代码并且没有任何问题。 行动过程如下：

• 首次运行 - VolumeSnapshot创建成功
• 第二次运行 - 代码返回 409 错误，说明资源已存在。

kubernetes.client.exceptions.ApiException: (409)
Reason: Conflict
<-- REDACTED --> 
HTTP response body: {"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"volumesnapshots.snapshot.storage.k8s.io \"snapshot-example-pvc\" already exists","reason":"AlreadyExists","details":{"name":"snapshot-example-pvc","group":"snapshot.storage.k8s.io","kind":"volumesnapshots"},"code":409}

旁注！

上面的错误是通过问题中的修改代码（主要是值）返回的。

尝试在已创建的资源上运行$ kubectl create -f resource.yaml -v=4时，您也会看到此错误。

---

对于任何对此感兴趣的人来说，这是问题中使用的代码的最小、可重现的示例（它缺少import并且def放错了位置）：

from kubernetes import client, config

def create_snapshot(namespace, pvc_name):

    config.load_kube_config()

    custom_api = client.CustomObjectsApi()

    snapshot_class = "snapshotclass"
    snapshot_name = f"snapshot-{pvc_name}"

    snapshot_resource = {
    "apiVersion": "snapshot.storage.k8s.io/v1beta1",
    "kind": "VolumeSnapshot",
    "metadata": {"name": snapshot_name},
    "spec": {
        "volumeSnapshotClassName": snapshot_class,
        "source": {"persistentVolumeClaimName": pvc_name}
        }
    }

    res = custom_api.create_namespaced_custom_object(
        group="snapshot.storage.k8s.io",
        version="v1beta1",
        namespace= namespace,
        plural="volumesnapshots",
        body=snapshot_resource,
    )

    print(res)

create_snapshot("default", "test-pvc")

---

其他资源：

• Github.com：Fabric8io：Kubernetes 客户端：问题：创建 pod 时出现 409 冲突状态代码
• Oreilly.com：库：查看：管理 Kubernetes：第 4 章