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

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#!/usr/bin/env bash
# Remove stale rsyslog PID file if it exists
rm -f /var/run/rsyslogd.pid
# Start rsyslog
supervisorctl start rsyslogd
# If our supervisor config has entries in the "isc-dhcp-relay" group...
if [ $(supervisorctl status | grep -c "^isc-dhcp-relay:") -gt 0 ]; then
# Wait for all interfaces to come up and be assigned IPv4 addresses before
# starting the DHCP relay agent(s). If an interface the relay should listen
# on is down, the relay agent will not start. If an interface the relay
# should listen on is up but does not have an IP address assigned when the
# relay agent starts, it will not listen or send on that interface for the
# lifetime of the process.
/usr/bin/wait_for_intf.sh
# Start all DHCP relay agent(s)
supervisorctl start isc-dhcp-relay:*
fi