Comment by kawsper

Oh, you are right, after searching a little on the subject it looks like some people are doing things like this:

    iptables -I INPUT -p tcp -m multiport —dports 80,443 —syn -j DROP && sleep 0.5 && \
    /etc/init.d/haproxy reload;
    iptables -D INPUT -p -tcp -m multiport —dports 80,443 —syn -j DROP

Source: https://medium.com/@Drew_Stokes/actual-zero-downtime-with-ha...