[lxcfs] add lxcfs support for docklet

conf/lxc-script/lxc-ifdown

@@ -1,3 +1,9 @@
 #!/bin/sh
 
+# $1 : name of container ( name in lxc-start with -n)
+# $2 : net
+# $3 : network flags, up or down
+# $4 : network type, for example, veth
+# $5 : value of lxc.network.veth.pair 
+
 ovs-vsctl --if-exists del-port $Bridge $5

conf/lxc-script/lxc-prestart

@@ -5,4 +5,12 @@
 # $3 Section (always 'lxc').
 # $4 The hook type (i.e. 'clone' or 'pre-mount').
 
+# following environment variables are set by lxc :
+# $LXC_NAME: is the container's name.
+# $LXC_ROOTFS_MOUNT: the path to the mounted root filesystem.
+# $LXC_CONFIG_FILE: the path to the container configuration file.
+# $LXC_SRC_NAME: in the case of the clone hook, this is the original container's name.
+# $LXC_ROOTFS_PATH: this is the lxc.rootfs entry for the container. 
+#                   Note this is likely not where the mounted rootfs is to be found, use LXC_ROOTFS_MOUNT for that.
+
 echo $HNAME > $LXC_ROOTFS_PATH/etc/hostname

prepare.sh

@@ -27,7 +27,7 @@ fi
 
 # install packages that docklet needs (in ubuntu)
 # some packages' name maybe different in debian
-apt-get install -y cgmanager lxc lvm2 bridge-utils curl exim4 openssh-server openvswitch-switch 
+apt-get install -y cgmanager lxc lxcfs lxc-templates lvm2 bridge-utils curl exim4 openssh-server openvswitch-switch 
 apt-get install -y python3 python3-netifaces python3-flask python3-flask-sqlalchemy python3-pampy
 apt-get install -y python3-psutil
 apt-get install -y python3-lxc