Fixes #18

Author: haxorof

CHANGELOG.md

@@ -11,6 +11,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 - Add support to ensure Docker is not upgraded ([#17](../../issues/17))
 
+### Fixed
+
+- /proc/sys/fs/may_detach_mounts does not exists in all kernel 3.10 versions ([#18](../../issues/18))
+
 ## [1.0.1](../../releases/tag/1.0.1) - 2017-10-22
 
 ### Fixed

tasks/main-CentOS.yml

@@ -37,16 +37,21 @@
   become: true
   when: yum_repo.changed
 
+- name: Stat /proc/sys/fs/may_detach_mounts
+  stat:
+    path: /proc/sys/fs/may_detach_mounts
+  register: may_detach_mounts
+
 - name: Ensure fs.may_detach_mounts is set to avoid 'Device or resource busy'
   sysctl:
     name: fs.may_detach_mounts
     value: 1
     sysctl_file: /etc/sysctl.d/99-docker.conf
     reload: yes
   become: true
-  when: ansible_kernel | version_compare('4', '<')
+  when: ansible_kernel|version_compare('4', '<') and may_detach_mounts.stat.exists
 
 - include: main-Mountflags.yml
-  when: ansible_kernel | version_compare('4', '<')
+  when: ansible_kernel|version_compare('4', '<')
 
 - include: main-Generic.yml