[packages/docker] add systemd note

[glen]

commit b4d3994d0d545c8fa7bf0df93b66a589bfe1edb7
Author: Elan Ruusamäe <glen at delfi.ee>
Date:   Mon Sep 26 22:27:51 2016 +0300

    add systemd note

 docker.sysconfig | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/docker.sysconfig b/docker.sysconfig
index 8ac1cf7..4f3191c 100644
--- a/docker.sysconfig
+++ b/docker.sysconfig
@@ -7,6 +7,10 @@ SERVICE_RUN_NICE_LEVEL="+0"
 SERVICE_LIMITS="-n 1048576 -u 1048576"
 
 # Modify these options if you want to change the way the docker daemon runs
+# IMPORTANT:
+# When using systemd, do not use variables in variables:
+#  OPTIONS="$OPTIONS --foo"
+# ... systemd parser does not handle these
 #OPTIONS=""
 
 # Use overlay storage driver
================================================================

---- gitweb:

http://git.pld-linux.org/gitweb.cgi/packages/docker.git/commitdiff/b4d3994d0d545c8fa7bf0df93b66a589bfe1edb7