ResourceWarning: unclosed SSLSocket

while calling self.core_api_instance.list_namespaced_pod method getting following warning message:

/usr/lib64/python3.5/json/decoder.py:355: ResourceWarning: unclosed <ssl.SSLSocket fd=5, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=0, laddr=('<lan-ip>', 40169), raddr=('<remote-ip>', 6443)>
  obj, end = self.scan_once(s, idx)

Note:I am using unittest package in python then only above warning message is coming. Any idea reason behind it?

[tdesikan]

While ignoring the ResourceWarning is one approach, a better one might be to explicitly close all the underlying connection pools that the kubernetes client uses.

Adding a __del__ function and calling rest_client.pool_manager.clear() seems to do the trick.

def __init__(self):
  self._api = client.CoreV1Api()

def __del__(self):
  self._api.api_client.rest_client.pool_manager.clear()
  self._api.api_client.close()

[dguyhasnoname]

thanks to @mturde. It worked for me: https://github.com/dguyhasnoname/k8s-cluster-checker/blob/master/objects/test.py