Python: host is set to localhost when loading from kube config file in v12

[Limonkufu]

What happened (please include outputs or screenshots):
We are using the following code to set up:

from kubernetes import client, config, watch

config.load_kube_config(kubeconfig)
    host = config.kube_config.Configuration().host
    logging.info("HOST INFO: {}".format(host))

The kubeconfig file has server field set up correctly. This is working with with version 11.0.0 correctly but when we change the version to 12.0.0 then it returns:

HOST INFO: http://localhost

I tried to investigate it and according to kube_config.py file it should be set correctly in _load_cluster_info method but it is not setting up correctly.

What you expected to happen:
Host url to be set correctly in compliance with kube-config file

How to reproduce it (as minimally and precisely as possible):

• Install version 11.0.0 run the above code with a valid kube-config file
• See the host url set correctly
• Update the version to 12.0.0 and run the code again
• See the host url set incorrectly to http://localhost

Anything else we need to know?:

Environment:

• Kubernetes version (kubectl version): v1.18.2
• OS (e.g., MacOS 10.13.6): Ubuntu 18.04
• Python version (python --version) 3.7
• Python client version (pip list | grep kubernetes) 12.0.0

[felixhuettner]

We just encountered the same thing. It seems like this change requires you now to explicitly get the default configuration.

So your line would need to change to something like:
host = config.kube_config.Configuration.get_default_copy().host

Something like this should probably be mentioned in the release notes.

[Limonkufu]

@felixhuettner thanks this solves the issue but using get_default_copy() instead of direct call seems counter-intuitive after setting the configuration from file. (note that this change is also not documented in the readme/examples)

[rasisuku]

I am also facing this issue.

[chancez]

At the very least, this needs a mention in the changelog so that users know how to fix this.

[ntavares]

load_incluster_config() broke too for 12.0.0. It's not clear to me yet how to retain the same mechanism...

[DontWorry33]

My process for setting up my configuration when using load_incluster_config() was:

from kubernetes import client, config, utils
from kubernetes.client import Configuration

config.load_incluster_config()
c = Configuration()
c.assert_hostname = False
Configuration.set_default(c)

which failed to work with for 12.0.0. But if I don't set the new Configuration object as default and only have:

config.load_incluster_config()

it seems to use the correct cluster configuration

[roycaihw]

/assign
cc @palnabarun @yliaog

[liyao2598330]

I have the same problem,when i use client 8.0.0 get kubernetes version info,It is normal.

from sdk.v8.kubernetes import client
from sdk.v8.kubernetes import config

config.load_kube_config()
configuration = client.Configuration()
configuration.verify_ssl = False

api_client = client.ApiClient(configuration=configuration)
version_api = client.VersionApi(api_client)
print(version_api.get_code())

##output
{
   'build_date': '2019-04-22T11:34:20Z',
   'compiler': 'gc',
   'git_commit': '8cb561c',
   'git_tree_state': '',
   'git_version': 'v1.12.6-aliyun.1',
   'go_version': 'go1.10.8',
   'major': '1',
   'minor': '12+',
   'platform': 'linux/amd64'
}

but when i use client 12.0.0.0,a procedural exception has occurred.

urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='localhost', port=80): Max retries exceeded with url: /version/ (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7f9c7cf6f070>: Failed to establish a new connection: [Errno 61] Connection refused'))

It looks like a configuration error,After referring to the above answer, I modified it to

from sdk.v12.kubernetes import client
from sdk.v12.kubernetes import config

config.load_kube_config()
configuration = client.Configuration().get_default_copy()
configuration.verify_ssl = False

api_client = client.ApiClient(configuration=configuration)
version_api = client.VersionApi(api_client)
print(version_api.get_code())

That solved my problem,I think that part of the configuration code logic has changed

[riceluxs1t]

@ntavares I confirm this. Have you found a workaround that uses either v12.0.0 or v12.0.1? I am currently using the following code snippet and it fails

from kubernetes import config, client
from kubernetes.client import ApiClient
from kubernetes.dynamic import DynamicClient

config.load_incluster_config()
configuration = client.Configuration.get_default_copy()

k8s_client = ApiClient(configuration=configuration)
dyn_client = DynamicClient(k8s_client)
dyn_client.resources.get(kind="Secret").create(...)

Version: 12.0.1
Python Version: 3.7.6
K8s version: v1.18.9