Docker fornece vários drivers de rede (bridge, host, overlay, macvlan, none) para diferentes necessidades de conectividade, além de recursos como redes definidas pelo usuário com descoberta de serviços baseada em DNS. Compreender a rede em profundidade é importante para conectar aplicações multi-container e multi-host corretamente.
Drivers de rede
BRIDGE (default) → a private internal network on a single host; containers communicate;
isolated from the host except via published ports. USER-DEFINED bridges add DNS
(containers reach each other by name) — preferred over the default bridge.
HOST → the container uses the host's network stack directly (no isolation, no port
mapping needed) — max performance, less isolation.
OVERLAY → spans MULTIPLE hosts → containers on different machines communicate
(for Docker Swarm / multi-host clusters).
MACVLAN → gives a container its own MAC/IP on the physical network (appears as a
physical device).
NONE → no networking (fully isolated).
