[skip ci] Add export logs method to utils (#13067)

Signed-off-by: ThreadDao <yufen.zong@zilliz.com>

tests/python_client/utils/util_k8s.py

@@ -1,3 +1,4 @@
+import os.path
 import time
 from kubernetes import client, config
 from kubernetes.client.rest import ApiException
@@ -78,6 +79,35 @@ def get_pod_list(namespace, label_selector):
         raise Exception(str(e))
 
 
+def export_pods_log(namespace, label_selector):
+    """
+    export pod logs with label selector to '/tmp/milvus'
+
+    :param namespace: the namespace where the release
+    :type namespace: str
+
+    :param label_selector: labels to restrict which pods logs to export
+    :type label_selector: str
+
+    :example:
+            >>> export_logs("chaos-testing", "app.kubernetes.io/instance=mic-milvus")
+    """
+    pod_log_path = '/tmp/milvus'
+    if not os.path.isdir(pod_log_path):
+        os.makedirs(pod_log_path)
+
+    # get pods and export logs
+    items = get_pod_list("chaos-testing", label_selector=label)
+    try:
+        for item in items:
+            pod_name = item.metadata.name
+            os.system(f'kubectl logs {pod_name} > {pod_log_path}/{pod_name}.log 2>&1')
+    except Exception as e:
+        log.error(f"Exception when export pod {pod_name} logs: %s\n" % e)
+        raise Exception(str(e))
+
+
 if __name__ == '__main__':
     label = "app.kubernetes.io/instance=test-proxy-pod-failure, component=proxy"
     res = get_pod_list("chaos-testing", label_selector=label)
+    export_pods_log(namespace='chaos-testing', label_selector=label)