diff --git a/check_openstack.py b/check_openstack.py
index 088911f..548051b 100644
--- a/check_openstack.py
+++ b/check_openstack.py
@@ -3,33 +3,33 @@
 import os
 import requests
 import yaml
+import argparse
 
 from novaclient.client import Client as nova_auth
 from keystoneclient.v3.client import Client as keystone_auth
 
-def get_credentials():
-    with open('/home/arif/clouds.yaml','r') as stream:
-        creds = yaml.safe_load(stream)['clouds']['arif-home']['auth']
+def get_credentials(site_id):
+    home = os.environ['HOME']
+    with open('{}/clouds.yaml'.format(home),'r') as stream:
+        creds = yaml.safe_load(stream)['clouds'][site_id]['auth']
 
     creds['version'] = '2'
     return creds
 
-def get_auth_token():
-    creds = get_credentials()
+def get_auth_token(creds):
     keystone_client = keystone_auth(**creds)
     
     return keystone_client.auth_token
 
-def get_servers():
-    creds = get_credentials()
+def get_servers(creds):
     nova_client = nova_auth(**creds)
 
     print(nova_client.servers.list())
 
-def get_cores():
+def get_cores(creds):
     url="http://placement.example.com:8778"
 
-    token = get_auth_token()
+    token = get_auth_token(creds)
 
     headers = {}
     headers['content-type'] = 'application/json'
@@ -59,9 +59,18 @@ def get_cores():
 
       print("{}: {}".format(hostname,cores))
 
-def main():
-    get_servers()
-    get_cores()
+def _parse_args():
+    parser = argparse.ArgumentParser()
+    parser.add_argument('-s', '--site', metavar="<site-id>",
+                        help="Site to run against", dest="site_id",
+                        required=True)
+    return parser.parse_args()
+
+def main(args):
+    creds = get_credentials(args.site_id)
+
+    get_servers(creds)
+    get_cores(creds)
 
 if __name__ == '__main__':
-    main()
+    main(_parse_args())