Adding the root_helper line to dhcp_agent.ini, identical to the one I already have in quantum.conf, resolved the problem for me as well.
A notable difference seems to be that in quantum.conf it resides under the AGENT section by default; in dhcp_agent.ini it resides under the DEFAULT section.
Adding the root_helper line to dhcp_agent.ini, identical to the one I already have in quantum.conf, resolved the problem for me as well.
A notable difference seems to be that in quantum.conf it resides under the AGENT section by default; in dhcp_agent.ini it resides under the DEFAULT section.