Docker विभिन्न connectivity आवश्यकताओं के लिए कई network drivers (bridge, host, overlay, macvlan, none) प्रदान करता है, साथ ही DNS-आधारित service discovery वाले user-defined networks जैसी सुविधाएँ। networking को गहराई से समझना multi-container और multi-host applications को सही ढंग से जोड़ने के लिए महत्वपूर्ण है।
network drivers
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).
