Update dpdkbind.service with EnvironmentFile

developers/Vagrantfile

@@ -139,7 +139,6 @@ sudo cp /tmp/ovsdb-server.service /etc/systemd/system/ovsdb-server.service
 sudo cp /tmp/dpdkbind.service /etc/systemd/system/dpdkbind.service
 
 # Name of network interface provisioned for DPDK to bind
-export NET_IF_NAME=enp0s18
 sudo apt-get -qq update
 sudo apt-get -y -qq install clang doxygen hugepages build-essential libnuma-dev libpcap-dev inux-headers-`uname -r` dh-autoreconf libssl-dev libcap-ng-dev openssl python python-pip htop
 sudo pip install six
@@ -181,8 +180,7 @@ echo "igb_uio" | sudo tee -a /etc/modules
 
 # Bind secondary network adapter
 # Note that this NIC setup will binding dpdk port after reboot
-echo "ExecStart=/sbin/ifconfig ${NET_IF_NAME} down" | sudo tee -a /etc/systemd/system/dpdkbind.service
-echo "ExecStart=${DPDK_DIR}/usertools/dpdk-devbind.py --bind=igb_uio ${NET_IF_NAME}" | sudo tee -a /etc/systemd/system/dpdkbind.service
+echo 'NET_IF_NAME=enp0s18' | sudo tee -a /etc/default/dpdkbind
 sudo systemctl enable dpdkbind
 sudo systemctl start dpdkbind
 sudo ${DPDK_DIR}/usertools/dpdk-devbind.py --status

developers/systemctl/dpdkbind.service

@@ -8,3 +8,6 @@ WantedBy=multi-user.target
 [Service]
 Type=oneshot
 RemainAfterExit=true
+EnvironmentFile=-/etc/default/dpdkbind
+ExecStart=/sbin/ifconfig "$NET_IF_NAME" down
+ExecStart=/usr/src/dpdk-stable-17.11.2/usertools/dpdk-devbind.py --bind=igb_uio "$NET_IF_NAME"