diff --git a/Vagrantfile b/Vagrantfile
index 22bedba9d..064601ac9 100644
--- a/Vagrantfile
+++ b/Vagrantfile
@@ -21,10 +21,11 @@ ansible_provision = proc do |ansible|
   # these aren't supported by Vagrant, see
   # https://github.com/mitchellh/vagrant/issues/3539
   ansible.groups = {
-    'mons' => (0..NMONS - 1).map { |j| "mon#{j}" },
-    'osds' => (0..NOSDS - 1).map { |j| "osd#{j}" },
-    'mdss' => (0..NMDSS - 1).map { |j| "mds#{j}" },
-    'rgws' => (0..NRGWS - 1).map { |j| "rgw#{j}" }
+    'mons'    => (0..NMONS - 1).map { |j| "mon#{j}" },
+    'osds'    => (0..NOSDS - 1).map { |j| "osd#{j}" },
+    'mdss'    => (0..NMDSS - 1).map { |j| "mds#{j}" },
+    'rgws'    => (0..NRGWS - 1).map { |j| "rgw#{j}" },
+    'clients' => (0..CLIENTS - 1).map { |j| "client#{j}" }
   }
 
   # In a production deployment, these should be secret
diff --git a/roles/ceph-common/defaults/main.yml b/roles/ceph-common/defaults/main.yml
index 1b297919c..b5d25afbf 100644
--- a/roles/ceph-common/defaults/main.yml
+++ b/roles/ceph-common/defaults/main.yml
@@ -51,7 +51,7 @@ ceph_dev_redhat_distro: centos7
 #
 fsid: "{{ cluster_uuid.stdout }}"
 cephx: true
-cephx_require_signatures: true # Kernel RBD does NOT support signatures!
+cephx_require_signatures: true # Kernel RBD does NOT support signatures for Kernels < 3.18!
 cephx_cluster_require_signatures: true
 cephx_service_require_signatures: false
 max_open_files: 131072
diff --git a/site.yml b/site.yml
index 72704be59..2579dafcc 100644
--- a/site.yml
+++ b/site.yml
@@ -6,6 +6,7 @@
   - osds
   - mdss
   - rgws
+  - clients # Kernel RBD does NOT support signatures for Kernels < 3.18! Make sure to set cephx_require_signatures: false
   sudo: True
   roles:
   - { role: ceph-common, when: not docker }