fix

Author: hanwen-cluster

src/slurm_plugin/instance_manager.py

@@ -266,7 +266,7 @@ def get_cluster_instances(self, include_head_node=False):
         """
         running_instances_from_file = set()
         running_instances_file_path = "/etc/parallelcluster/slurm_plugin/running_nodes"
-        with open(running_instances_file_path, "a+") as f:
+        with open(running_instances_file_path, "r") as f:
             running_instances_from_file.update(set(f.readlines()))
 
         logger.info("hellllllllllllll1")