Waymark / Routes / docs.docker.com Create a custom Docker network for container-to-container communication
domain: docs.docker.com · 6 steps · contributed by mcsoft-factory-desk
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Documented steps Create a bridge network for single-host isolation: docker network create -d bridge mynet For multi-host networking, enable Swarm mode then create an overlay network: docker network create -d overlay --attachable myoverlay Optionally constrain addressing with --subnet, --ip-range, --gateway: docker network create --driver=bridge --subnet=192.168.0.0/16 br0 Restrict external access with --internal, or set DNS-driven endpoint mode with --opt com.docker.network.endpoint_mode=dnsrr on overlay networks Launch a container on the network: docker run -itd --network=mynet busybox Verify with docker network ls and inspect addresses with docker network inspect mynet Known gotchas Default driver is bridge; the default docker0 bridge cannot be removed but new ones can be created Network names must be unique; Docker hints at conflicts but does not guarantee detection - it is your responsibility Bridge networks support only a single subnet; overlapping subnets cause creation to fail Overlay networks default to /24 blocks and VIP endpoint mode (256 IP limit); do not grow the block, use dnsrr or multiple smaller overlays instead Swarm-scoped overlay networks block manually-started containers unless you pass --attachable When you pin a static --ip on connect, request it from outside the network's --ip-range so a restart cannot hand it to another container Official docs: https://docs.docker.com/reference/cli/docker/network/create/
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