--- docker-1.12.1/contrib/init/systemd/docker.service	2016-08-30 00:06:51.450800482 +0300
+++ docker-1.12.1/contrib/init/systemd/docker.service	2016-09-26 21:36:55.000000000 +0300
@@ -5,11 +5,12 @@
 Requires=docker.socket
 
 [Service]
+EnvironmentFile=-/etc/sysconfig/docker
 Type=notify
 # the default is not to use systemd for cgroups because the delegate issues still
 # exists and systemd currently does not support the cgroup feature set required
 # for containers run by docker
-ExecStart=/usr/bin/dockerd -H fd://
+ExecStart=/usr/sbin/dockerd -H fd:// $OPTIONS
 ExecReload=/bin/kill -s HUP $MAINPID
 # Having non-zero Limit*s causes performance problems due to accounting overhead
 # in the kernel. We recommend using cgroups to do container-local accounting.