please use following command: docker run --restart=unless-stopped -e INTERFACE="ens32" -e STATE="BACKUP" -e VIRTUAL_ROUTER_ID="51" -e PRIORITY="100" -e VIRTUAL_IP="192.168.101.200" -e VIRTUAL_MASK="24" -d -v /root/keep-haproxy/haproxy.cfg:/usr/local/etc/haproxy/haproxy.cfg:ro --net=host --privileged 10.0.2.50/winhong/docker-keepalived-haproxy:20170522-2
-f, /usr/local/etc/haproxy/haproxy.cfg

or use d2.yml