diff --git a/README.md b/README.md
index c31cbc7..6dcabc2 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,14 @@
-#hpc-cloud
+# hpc-cloud
 
 This repository will contain playbooks to bring up openstack components inside docker containers.
 
-It makes use of [/home/egon/projects/hpc-cloud/roles/common/tasks/users.yml](ansible roles).
+It makes use of ansible roles.
 The roles can be set in the inventory file (hosts)
 
-Cirrently,Tue 25 Apr 2017 02:45:20 PM CEST, only mariadb and keystone are implemented. They can be brought up with
- $ ansible-playbook main.yml
+To bring up one role, for instance keystone, use:
+
+    $ ansible-playbook keystone.yml
+
+To bring up all roles, use
+
+    $ ansible-playbook site.yml
diff --git a/roles/keystone/files/Dockerfile b/roles/keystone/files/Dockerfile
index d30f204..f23e6fc 100644
--- a/roles/keystone/files/Dockerfile
+++ b/roles/keystone/files/Dockerfile
@@ -4,6 +4,7 @@
 # run keystone-manage db_sync from this docker first:
 # $ docker run hpc/keystone --add-host=mariadb:<ip mariadb> "keystone-manage db_sync"
 
+# wellicht ubuntu 16.04 of anders 18.04
 FROM ubuntu:zesty
 
 RUN apt-get update
@@ -11,6 +12,7 @@ RUN apt-get update
 RUN apt-get install --yes keystone
 
 # set admin token TODO: make this a secret
+# in volume of met env
 ADD keystone.conf /etc/keystone/keystone.conf
 
 RUN mkdir /etc/keystone/fernet-keys
diff --git a/roles/mariadb/files/mysql.service b/roles/mariadb/files/mysql.service
index c82c263..ec696fc 100644
--- a/roles/mariadb/files/mysql.service
+++ b/roles/mariadb/files/mysql.service
@@ -8,9 +8,9 @@ TimeoutStartSec=0
 Restart=always
 ExecStartPre=-/usr/bin/docker stop %n
 ExecStartPre=-/usr/bin/docker rm %n
-ExecStartPre=/usr/bin/docker pull mariadb:10.1.22
+ExecStartPre=/usr/bin/docker pull mariadb:10.2
 ExecStart=/usr/bin/docker run  -p 3306:3306 --name %n -v /srv/lib/mysql:/var/lib/mysql \
- -e MYSQL_ROOT_PASSWORD=geheim mariadb:10.1.22
+ -e MYSQL_ROOT_PASSWORD=geheim mariadb:10.2
  
 [Install]
 WantedBy=multi-user.target
diff --git a/main.yml b/site.yml
similarity index 100%
rename from main.yml
rename to site.yml