Common Issues strconv.Atoi: parsing "": invalid syntax Solution docker-compose down --remove-orphans Remove all docker images and containers docker system prune -a Validate/Test the haproxy configuration, docker run -it --rm --name haproxy-syntax-check haproxy-docker haproxy -c -f /usr/local/etc/haproxy/haproxy.cfg Open JMeter via terminal open /usr/local/bin/jmeter