diff --git a/roles/juju-setup/defaults/main.yml b/roles/juju-setup/defaults/main.yml
index a9c7e81..e01d658 100644
--- a/roles/juju-setup/defaults/main.yml
+++ b/roles/juju-setup/defaults/main.yml
@@ -8,6 +8,7 @@
 charm_versions: {}
 
 pki_dir: "{{ playbook_dir }}/pki"
+credentials_dir: "{{ playbook_dir }}/credentials"
 
 site_name: placeholder-sitename
 site_suffix: "{{ site_name }}.test"
diff --git a/roles/juju-setup/templates/juju_config.yml.j2 b/roles/juju-setup/templates/juju_config.yml.j2
index bf157ea..e91e5c2 100644
--- a/roles/juju-setup/templates/juju_config.yml.j2
+++ b/roles/juju-setup/templates/juju_config.yml.j2
@@ -54,7 +54,8 @@
   openstack-origin: "cloud:trusty-kilo"
 
 percona-cluster:
-  max-connections: 20000
+  max-connections: 5000
+  innodb-buffer-pool-size: "20%"
 
 rabbitmq-server:
   ssl: "on"