Add default sysfs settings

This uses the new Alpine sysfs.conf service to allow config of sysfs.

Default file that sets transparent huge pages to only be used on request
to fix #368

Database setting available for user configuration.

Signed-off-by: Justin Cormack <justin.cormack@docker.com>

alpine/Dockerfile

@@ -72,7 +72,6 @@ COPY packages/oom/etc /etc/
 COPY packages/9pmount-vsock/9pmount-vsock /sbin/
 COPY packages/test/etc /etc/
 COPY packages/test/mobytest /usr/bin/
-COPY packages/sysctl/etc /etc/
 COPY packages/iptables/iptables /usr/local/sbin/
 COPY packages/containerd/etc /etc/
 COPY packages/aws/etc /etc/
@@ -97,6 +96,7 @@ RUN \
   rc-update add devfs sysinit && \
   rc-update add hwdrivers sysinit && \
   rc-update add sysfs && \
+  rc-update add sysfsconf && \
   rc-update add fsck && \
   rc-update add root && \
   rc-update add localmount && \

alpine/etc/sysfs.d/01-moby.conf

@@ -0,0 +1,2 @@
+kernel/mm/transparent_hugepage/enabled = madvise
+kernel/mm/transparent_hugepage/defrag = madvise

alpine/packages/hostsettings/etc/init.d/hostsettings

@@ -10,7 +10,7 @@ start() {
 	ebegin "Configuring host settings from database"
 
 	mobyconfig exists etc/sysctl.conf && mobyconfig get etc/sysctl.conf > /etc/sysctl.conf
-
+	mobyconfig exists etc/sysfs.conf && mobyconfig get etc/sysfs.conf > /etc/sysfs.conf
 	mobyconfig exists etc/resolv.conf && mobyconfig get etc/resolv.conf > /etc/resolv.conf
 
 	mobyconfig exists etc/hosts && mobyconfig get etc/hosts >> /etc/hosts