ValueError：选择器的值无效，不得为无

Question

我对 Kubernetes 很陌生，我必须使用 Kubernetes python-client 创建一个 pod。 因此，为了进行实验，我正在尝试运行项目提供的examples notebooks，而不做任何更改，看看事情是如何工作的。

在第 3 步以 intro_notebook.ipynb 开始出现错误：

ValueError: Invalid value for `selector`, must not be `None`

代码如下：

from kubernetes import client, config

我唯一更改的部分是第二个单元，因为我使用 Ubuntu 的 microk8s 运行 Kubernetes：

config.load_kube_config('/var/snap/microk8s/current/credentials/client.config')

api_instance = client.AppsV1Api()
dep = client.V1Deployment()
spec = client.V1DeploymentSpec() # <<< At this line I hit the error!

完整的回溯：

ValueError                                Traceback (most recent call last)
<ipython-input-9-f155901e8381> in <module>
      1 api_instance = client.AppsV1Api()
      2 dep = client.V1Deployment()
----> 3 spec = client.V1DeploymentSpec()

~/.local/share/virtualenvs/jupyter-2hJZ4kgI/lib/python3.8/site-packages/kubernetes/client/models/v1_deployment_spec.py in __init__(self, min_ready_seconds, paused, progress_deadline_seconds, replicas, revision_history_limit, selector, strategy, template)
     76         if revision_history_limit is not None:
     77             self.revision_history_limit = revision_history_limit
---> 78         self.selector = selector
     79         if strategy is not None:
     80             self.strategy = strategy

~/.local/share/virtualenvs/jupyter-2hJZ4kgI/lib/python3.8/site-packages/kubernetes/client/models/v1_deployment_spec.py in selector(self, selector)
    215         """
    216         if selector is None:
--> 217             raise ValueError("Invalid value for `selector`, must not be `None`")  # noqa: E501
    218 
    219         self._selector = selector

ValueError: Invalid value for `selector`, must not be `None`

我正在运行python3.8：

$ pip freeze | grep -e kuber
kubernetes==11.0.0

$ snap list microk8s 
Name      Version  Rev   Tracking       Publisher   Notes
microk8s  v1.18.6  1551  latest/stable  canonical✓  classic

更新

将 microk8s 降级到 v1.15.11 并没有解决问题。

Answer 1

这是因为他们将验证更改为在构造函数中进行，而不是稍后进行 - 这不是笔记本所期望的。 他们你只需要在构造Deployment之前将这些内部分配向上移动即可：

name = "my-busybox"
spec = client.V1DeploymentSpec(
    selector=client.V1LabelSelector(match_labels={"app":"busybox"}),
    template=client.V1PodTemplateSpec(),
)
container = client.V1Container(
    image="busybox:1.26.1",
    args=["sleep", "3600"],
    name=name,
)
spec.template.metadata = client.V1ObjectMeta(
    name="busybox",
    labels={"app":"busybox"},
)
spec.template.spec = client.V1PodSpec(containers = [container])
dep = client.V1Deployment(
    metadata=client.V1ObjectMeta(name=name),
    spec=spec,
)