diff --git a/README.md b/README.md
new file mode 100644
index 0000000..5b73cc1
--- /dev/null
+++ b/README.md
@@ -0,0 +1,52 @@
+Slurm
+=====
+
+Install and configure Slurm
+
+Role Variables
+--------------
+
+All variables are optional. However, if unset, the role will essentially do nothing. See the [defaults][defaults] and [example playbook](#example-playbook) for examples.
+
+You need to define a `slurm_user` like this, unless you want to override anything.
+
+```yaml
+slurm_user: {}
+```
+
+For the various roles a slurm node can play, you can either set group names, or add values to a list, `slurm_roles`.
+
+- group slurmservers or `slurm_roles: ['controller']`
+- group slurmexechosts or `slurm_roles: ['exec']`
+- group slurmdbdservers or `slurm_roles: ['dbd']`
+
+Dependencies
+------------
+
+None.
+
+Example Playbook
+----------------
+
+```yaml
+- name: Slurm all in One
+  hosts: all
+  vars:
+    slurm_user: {}
+    slurm_roles: ['controller', 'exec', 'dbd']
+  roles:
+    - galaxyproject.slurm
+```
+
+License
+-------
+
+MIT
+
+Author Information
+------------------
+
+[Nate Coraor](https://github.com/natefoo)
+[Helena Rasche](https://github.com/erasche)
+
+[View contributors on GitHub](https://github.com/galaxyproject/ansible-cvmfs/graphs/contributors)
diff --git a/defaults/main.yml b/defaults/main.yml
index 9cad024..65c0058 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -1,3 +1,3 @@
 ---
-
 slurm_upgrade: no
+slurm_roles: []
diff --git a/tasks/main.yml b/tasks/main.yml
index de53ad0..49f3791 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -24,15 +24,15 @@
 
 - name: Include controller installation tasks
   include: slurmctld.yml
-  when: "'slurmservers' in group_names"
+  when: "'slurmservers' in group_names or 'controller' in slurm_roles"
 
 - name: Include execution host installation tasks
   include: slurmd.yml
-  when: "'slurmexechosts' in group_names"
+  when: "'slurmexechosts' in group_names or 'exec' in slurm_roles"
 
 - name: Include DB installation tasks
   include: slurmdbd.yml
-  when: "'slurmdbdservers' in group_names"
+  when: "'slurmdbdservers' in group_names 'dbd' in slurm_roles"
 
 - name: Install Slurm client (apt)
   apt:
@@ -129,18 +129,18 @@
     name: "{{ slurmdbd_service_name }}"
     enabled: yes
     state: started
-  when: "'slurmdbdservers' in group_names"
+  when: "'slurmdbdservers' in group_names 'dbd' in slurm_roles"
 
 - name: Ensure slurmctld is running
   service:
     name: "{{ slurmctld_service_name }}"
     enabled: yes
     state: started
-  when: "'slurmservers' in group_names"
+  when: "'slurmservers' in group_names or 'controller' in slurm_roles"
 
 - name: Ensure slurmd is running
   service:
     name: "{{ slurmd_service_name }}"
     enabled: yes
     state: started
-  when: "'slurmexechosts' in group_names"
+  when: "'slurmexechosts' in group_names or 'exec' in slurm_roles"