From 14bd3e5d232c28b79788f31dca987083558bb0c2 Mon Sep 17 00:00:00 2001
From: Alexander Block <ablock84@gmail.com>
Date: Wed, 7 Dec 2016 17:18:41 +0100
Subject: [PATCH] Allow to specify docker storage driver

---
 inventory/group_vars/all.yml             | 4 ++++
 roles/docker/templates/docker.service.j2 | 3 +++
 2 files changed, 7 insertions(+)

diff --git a/inventory/group_vars/all.yml b/inventory/group_vars/all.yml
index f64cab5aa..849fae574 100644
--- a/inventory/group_vars/all.yml
+++ b/inventory/group_vars/all.yml
@@ -157,6 +157,10 @@ docker_daemon_graph: "/var/lib/docker"
 ## to self hosted registries like so:
 docker_options: "--insecure-registry={{ kube_service_addresses }} --graph={{ docker_daemon_graph }}"
 
+## Uncomment this if you want to force overlay/overlay2 as docker storage driver
+## Please note that overlay2 is only supported on newer kernels
+#docker_storage_options: -s overlay2
+
 # K8s image pull policy (imagePullPolicy)
 k8s_image_pull_policy: IfNotPresent
 
diff --git a/roles/docker/templates/docker.service.j2 b/roles/docker/templates/docker.service.j2
index 60ab22194..584557cee 100644
--- a/roles/docker/templates/docker.service.j2
+++ b/roles/docker/templates/docker.service.j2
@@ -11,6 +11,9 @@ Wants=docker.socket
 
 [Service]
 Type=notify
+{% if docker_storage_options is defined %}
+Environment="DOCKER_STORAGE_OPTIONS={{docker_storage_options}}"
+{% endif %}
 Environment=GOTRACEBACK=crash
 ExecReload=/bin/kill -s HUP $MAINPID
 Delegate=yes