diff --git a/roles/setup-devstack-log-dir/README.rst b/roles/setup-devstack-log-dir/README.rst
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+++ b/roles/setup-devstack-log-dir/README.rst
@@ -0,0 +1,11 @@
+Set up the devstack log directory
+
+Create a log directory on the ephemeral disk partition to save space
+on the root device.
+
+**Role Variables**
+
+.. zuul:rolevar:: devstack_base_dir
+   :default: /opt/stack
+
+   The devstack base directory.
diff --git a/roles/setup-devstack-log-dir/defaults/main.yaml b/roles/setup-devstack-log-dir/defaults/main.yaml
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+++ b/roles/setup-devstack-log-dir/defaults/main.yaml
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+devstack_base_dir: /opt/stack
diff --git a/roles/setup-devstack-log-dir/tasks/main.yaml b/roles/setup-devstack-log-dir/tasks/main.yaml
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+++ b/roles/setup-devstack-log-dir/tasks/main.yaml
@@ -0,0 +1,5 @@
+- name: Create logs directory
+  file:
+    path: '{{ devstack_base_dir }}/logs'
+    state: directory
+  become: yes