Issues with minikube

[swhoro]

When I use this c lib on minikube, CoreV1API_listNamespacedEndpoints (and some other apis) will print error:

curl_easy_perform() failed

URL: https://192.168.49.2:8443/api/v1/namespaces/default/endpoints?allowWatchBookmarks=0&limit=0&sendInitialEvents=0&timeoutSeconds=0&watch=0
IP: 192.168.49.2
PORT: 8443
SCHEME: HTTPS
StrERROR: SSL peer certificate or SSH remote key was not OK
The return code of HTTP request=0
Cannot get any service.

It seems when load_kube_config, the apiKeys cannot parse correctly (maybe it is because there is no api token in my ~/.kube/config ?)

But the golang lib runs normally.

minikube version:

minikube version: v1.30.1
commit: 08896fd1dc362c097c925146c4a0d0dac715ace0

kubectl version:

clientVersion:
  buildDate: "2023-05-17T14:20:07Z"
  compiler: gc
  gitCommit: 7f6f68fdabc4df88cfea2dcf9a19b2b830f1e647
  gitTreeState: clean
  gitVersion: v1.27.2
  goVersion: go1.20.4
  major: "1"
  minor: "27"
  platform: linux/amd64
kustomizeVersion: v5.0.1
serverVersion:
  buildDate: "2023-03-15T13:33:12Z"
  compiler: gc
  gitCommit: 9e644106593f3f4aa98f8a84b23db5fa378900bd
  gitTreeState: clean
  gitVersion: v1.26.3
  goVersion: go1.19.7
  major: "1"
  minor: "26"
  platform: linux/amd64

[brendandburns]

What does your kube config file look like? It should be in $HOME/.kube/config Please paste it into this issue, but please make sure to redact any secret data (e.g. certificates) first.

[swhoro]

What does your kube config file look like? It should be in $HOME/.kube/config Please paste it into this issue, but please make sure to redact any secret data (e.g. certificates) first.

apiVersion: v1
clusters:
- cluster:
    certificate-authority: /home/***/.minikube/ca.crt
    extensions:
    - extension:
        last-update: Sat, 15 Jul 2023 21:04:32 CST
        provider: minikube.sigs.k8s.io
        version: v1.30.1
      name: cluster_info
    server: https://192.168.49.2:8443
  name: minikube
contexts:
- context:
    cluster: minikube
    extensions:
    - extension:
        last-update: Sat, 15 Jul 2023 21:04:32 CST
        provider: minikube.sigs.k8s.io
        version: v1.30.1
      name: context_info
    namespace: default
    user: minikube
  name: minikube
current-context: minikube
kind: Config
preferences: {}
users:
- name: minikube
  user:
    client-certificate: /home/***/.minikube/profiles/minikube/client.crt
    client-key: /home/***/.minikube/profiles/minikube/client.key

[brendandburns]

Looking at the code, we don't currently support loading from cetificate authorities from files outside of the kubeconfig file:

It wouldn't be hard to add support for this, we'd welcome a PR if you want to send it, the relevant code is here:

https://github.com/kubernetes-client/c/blob/master/kubernetes/config/kube_config_yaml.c#L215

[swhoro]

Thanks.

In fact, I am a noob of c, so I am not sure if I can do this.

I will try to fix this.

[brendandburns]

You'll want to do something similar to this which loads client keys:

https://github.com/kubernetes-client/c/blob/master/kubernetes/config/kube_config_yaml.c#L225

[swhoro]

You'll want to do something similar to this which loads client keys:

https://github.com/kubernetes-client/c/blob/master/kubernetes/config/kube_config_yaml.c#L225

Thanks for your hint, I have tested my modification and create a PR: #198

And I have another question: what does progress_func do.

In this example: https://github.com/kubernetes-client/c/blob/master/examples/multi_thread/watch_pod.c

There are two functions in apiClient named data_callback_func and progress_func

I think the data_callback_func will be called when the watched resources are changed (notified by k8s api server) . The program(thread) will be paused on CoreV1API_listNamespacedPod, resumed when notification comes and execute data_callback_func, and paused until next notification comes, keep looping like this.

But I do not know what does progress_func do and when will this function be called? I searched in Google but nothing related found.

So here is my question: did I understand data_callback_func correctly and what does progress_func do and when will it be triggered?

[ityuhui]

data_callback_func is called when new data is received by the C client library from API server. https://github.com/kubernetes-client/c/blob/c223563bda143b3ca9e38cbee5782b37cad040a3/kubernetes/src/apiClient.c#L470-L471

progress_func is called by libcurl while transmitting: https://github.com/kubernetes-client/c/blob/c223563bda143b3ca9e38cbee5782b37cad040a3/kubernetes/src/apiClient.c#L392-L393

https://curl.se/libcurl/c/CURLOPT_XFERINFOFUNCTION.html

Generally you don't need provide your progress_func, The example uses progress_func to exit watching and avoid memory leak.

[swhoro]

data_callback_func is called when new data is received by the C client library from API server.

https://github.com/kubernetes-client/c/blob/c223563bda143b3ca9e38cbee5782b37cad040a3/kubernetes/src/apiClient.c#L470-L471

progress_func is called by libcurl while transmitting:

https://github.com/kubernetes-client/c/blob/c223563bda143b3ca9e38cbee5782b37cad040a3/kubernetes/src/apiClient.c#L392-L393

https://curl.se/libcurl/c/CURLOPT_XFERINFOFUNCTION.html

Generally you don't need provide your progress_func, The example uses progress_func to exit watching and avoid memory leak.

Thank you

[ityuhui]

Close this issue as it is resovled by https://github.com/kubernetes-client/c/pull/198 Thanks @swhoro