network provision shell script.

gistfile1.txt

#!/bin/bash

ROUTER_ID="f2c8e7a4-ce7f-41cb-8c92-6e85a3453e57"
NS="qrouter-$ROUTER_ID"
LOG="/data/log/neutron/$NS-manual.log"

TIME=`date`
echo "Manual provision of $NS started at $TIME." > $LOG

# VLAN tag which is allocated by network admin.
VLAN="100"
# Physical if connected to the L2 switch which is used to route packet through the direct link . 
DIRECTLINK_PHY_IF="eth3"
DOT1Q_IF="$DIRECTLINK_PHY_IF.$VLAN"
# REMOTE SUBNET which is routable through the direct link. 
REMOTE_SUBNET="1.1.1.0/24"
DIRECTLINK_LOCAL_IP="169.254.1.1/24"
# This ip will serve as nexthop to REMOTE_CIDR. 
DIRECTLINK_REMOTE_IP="169.254.1.2"

function ensure_dot1q_if() {
    ip netns exec $NS ip link show $DOT1Q_IF
    if [ $? -ne 0 ]; then
	ip link show $DOT1Q_IF
	if [ $? -ne 0 ]; then
	    echo "vlan is not created yet, create it and move it into namespace." >> $LOG
	    ip link add link $DIRECTLINK_PHY_IF name $DOT1Q_IF type vlan id $VLAN
	    ip link set dev $DOT1Q_IF netns $NS
	    ip netns exec $NS ip link set $DOT1Q_IF up
	    ip netns exec $NS ip addr replace $DIRECTLINK_LOCAL_IP dev $DOT1Q_IF
	else
	    echo "vlan is is not present in namespace, move it in." >> $LOG
	    ip link set dev $DOT1Q_IF netns $NS
	    ip netns exec $NS ip link set $DOT1Q_IF up
	    ip netns exec $NS ip addr replace $DIRECTLINK_LOCAL_IP dev $DOT1Q_IF
	fi
    else
	echo "vlan if is already present in namespace." >> $LOG
	ip netns exec $NS ip link set $DOT1Q_IF up
	ip netns exec $NS ip addr replace $DIRECTLINK_LOCAL_IP dev $DOT1Q_IF
    fi
}

function ensure_routes() {
    ip netns exec $NS ip route replace $REMOTE_SUBNET dev $DOT1Q_IF via $DIRECTLINK_REMOTE_IP
}

ensure_dot1q_if
ensure_routes

echo "provision of $NS finished."  >> $LOG