diff --git a/gestion/gen_confs/generate.py b/gestion/gen_confs/generate.py
index 5709b7e7..03f47709 100755
--- a/gestion/gen_confs/generate.py
+++ b/gestion/gen_confs/generate.py
@@ -33,7 +33,7 @@ signal.signal(signal.SIGINT, signal.SIG_IGN) # Pas de Ctrl-C
 db = crans_ldap()
 make_lock('auto_generate', 'Big lock', nowait=1)
 
-def trigger(host):
+def trigger(host, background=False):
     if not 'adm.crans.org' in host:
         host=host + '.adm.crans.org'
     options = ['PasswordAuthentication=no', 'ConnectTimeout=1', 'VerifyHostKeyDNS=yes',
@@ -43,11 +43,14 @@ def trigger(host):
         args.append('-o')
         args.append(opt)
     args.extend(["rpcssh@%s" % host, "generate"])
-    p=subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
-    out, err = p.communicate()
-    if err:
-        raise Exception(err)
-    return out
+    if background:
+        subprocess.Popen(args)
+    else:
+        p=subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        out, err = p.communicate()
+        if err:
+            raise Exception(err)
+        return out
 
 class base_reconfigure:
     try: