sonic-buildimage/dockers/docker-dhcp-relay/start.sh

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#!/usr/bin/env bash
sonic-cfggen -m /etc/sonic/minigraph.xml -t /usr/share/sonic/templates/isc-dhcp-relay.j2 > /etc/default/isc-dhcp-relay
rm -f /var/run/rsyslogd.pid
supervisorctl start rsyslogd
VLAN_IFACE_NAME=`sonic-cfggen -m /etc/sonic/minigraph.xml -v "minigraph_vlan_interfaces[0]['attachto']"`
# Wait for the VLAN to come up (i.e., 'ip link show' returns 0)
until ip link show $VLAN_IFACE_NAME > /dev/null 2>&1; do
sleep 1
done
# Start the DHCP relay
supervisorctl start isc-dhcp-relay