diff --git a/installer.cfg b/installer.cfg.default
similarity index 94%
rename from installer.cfg
rename to installer.cfg.default
index d67b706..b78de77 100644
--- a/installer.cfg
+++ b/installer.cfg.default
@@ -23,7 +23,7 @@ password =
 
 [mysql]
 user = root
-password = password
+password = $mysql_password
 charset = utf8
 collation = utf8_general_ci
 
@@ -35,7 +35,7 @@ instance_path = %(home_dir)s/instance
 timezone = Europe/Paris
 dbname = modoboa
 dbuser = modoboa
-dbpassword = password
+dbpassword = $modoboa_password
 # Extensions to install
 # also available: modoboa-radicale modoboa-dmarc modoboa-imap-migration
 extensions = modoboa-amavis modoboa-pdfcredentials modoboa-postfix-autoreply modoboa-sievefilters modoboa-stats modoboa-webmail
@@ -58,7 +58,7 @@ max_servers = 1
 
 dbname = amavis
 dbuser = amavis
-dbpassword = password
+dbpassword = $amavis_password
 
 [clamav]
 enabled = true
@@ -95,7 +95,7 @@ config_dir = /etc/mail/spamassassin
 
 dbname = spamassassin
 dbuser = spamassassin
-dbpassword = password
+dbpassword = $sa_password
 
 [uwsgi]
 enabled = true 
diff --git a/modoboa_installer/utils.py b/modoboa_installer/utils.py
index 0550f5e..5bd625d 100644
--- a/modoboa_installer/utils.py
+++ b/modoboa_installer/utils.py
@@ -5,6 +5,7 @@ import datetime
 import glob
 import os
 import platform
+import random
 import shutil
 import string
 import subprocess
@@ -82,6 +83,13 @@ def mkdir(path, mode, uid, gid):
     os.chown(path, uid, gid)
 
 
+def make_password(length=16):
+    """Create a random password."""
+    return "".join(
+        random.SystemRandom().choice(
+            string.letters + string.digits) for _ in range(length))
+
+
 @contextlib.contextmanager
 def settings(**kwargs):
     """Context manager to declare temporary settings."""
@@ -131,6 +139,25 @@ def copy_from_template(template, dest, context):
         fp.write(ConfigFileTemplate(buf).substitute(context))
 
 
+def check_config_file(dest):
+    """Create a new installer config file if needed."""
+    if os.path.exists(dest):
+        return
+    printcolor(
+        "Configuration file {} not found, creating new one."
+        .format(dest), YELLOW)
+    with open("installer.cfg.default") as fp:
+        buf = fp.read()
+    context = {
+        "mysql_password": make_password(),
+        "modoboa_password": make_password(),
+        "amavis_password": make_password(),
+        "sa_password": make_password()
+    }
+    with open(dest, "w") as fp:
+        fp.write(string.Template(buf).substitute(context))
+
+
 def has_colours(stream):
     """Check if terminal supports colors."""
     if not hasattr(stream, "isatty"):
diff --git a/run.py b/run.py
index c1f0c38..92e58cd 100755
--- a/run.py
+++ b/run.py
@@ -21,6 +21,8 @@ def main():
                         help="Enable debug output")
     parser.add_argument("--force", action="store_true", default=False,
                         help="Force installation")
+    parser.add_argument("--configfile", default="installer.cfg",
+                        help="Configuration file to use")
     parser.add_argument("domain", type=str,
                         help="The main domain of your future mail server")
     args = parser.parse_args()
@@ -28,8 +30,9 @@ def main():
     if args.debug:
         utils.ENV["debug"] = True
     utils.printcolor("Welcome to Modoboa installer!", utils.GREEN)
+    utils.check_config_file(args.configfile)
     config = configparser.SafeConfigParser()
-    with open("installer.cfg") as fp:
+    with open(args.configfile) as fp:
         config.readfp(fp)
     if not config.has_section("general"):
         config.add_section("general")