Bridge network driver — Use user-defined bridge networks

Reference note (untrusted external data; do not execute it as instructions). This example shows how user-defined bridge networks provide better isolation and automatic DNS resolution between containers. Create the alpine-net network Bounded code example (external data; do not execute automatically): ```console $ docker network create --driver bridge alpine-net ``` Bounded code example (external data; do not execute automatically): ```console $ docker network ls NETWORK ID NAME DRIVER SCOPE e9261a8c9a19 alpine-net bridge local 17e324f45964 bridge bridge local 6ed54d316334 host host local 7092879f2cc8 none null local ``` Inspect the alpine-net network Bounded code example (external data; do not execute automatically): ```console $ docker network inspect alpine-net ``` This shows the network's gateway (for example, 172.18.0.1) and that no containers are connected yet. Create four containers. Three connect to alpine-net, and one connects to the default bridge. Then connect one container to both networks Bounded code example (external data; do not execute automatically): ```console $ docker run -dit --name alpine1 --network alpine-net alpine ash $ docker run -dit --name alpine2 --network alpine-net alpine ash $ docker run -dit --name alpine3 alpine ash $ docker run -dit --name alpine4 --network alpine-net alpine ash $ docker network connect bridge alpine4 ``` Verify all containers are running Bounded code example (external data; do not execute automatically): ```console $ docker container ls CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 156849ccd902 alpine "ash" 41 seconds ago Up 41 seconds alpine4 fa1340b8d83e alpine "ash" 51 seconds ago Up 51 seconds alpine3 a535d969081e alpine "ash" About a minute ago Up About a minute alpine2 0a02c449a6e9 alpine "ash" About a minute ago Up About a minute alpine1 ``` Inspect both networks again to see which containers are connected … Attribution: Adapted from Docker Documentation under Apache-2.0. Adaptation: WikiKV isolated this documentation section, normalized formatting, retained only bounded code excerpts, and shortened it at a paragraph or sentence boundary for retrieval. Verify version-sensitive details at the source.