Docker 服务发现不适用于默认网桥

Question

似乎 docker 服务发现仅适用于用户定义的网络，而不适用于默认网桥(docker0)，但我在文档中没有找到任何内容。
docker run --rm -d --name c1 alpine sleep 2hdocker run --rm -d --name c2 alpine sleep 2hdocker exec -ti c1 ping c2
它给了我 ping: bad address 'c2'
但是如果我创建一个自定义桥接网络一切正常:docker network create u-bridgedocker run --rm -d --name u1 --net u-bridge alpine sleep 2hdocker run --rm -d --name u2 --net u-bridge alpine sleep 2hdocker exec -ti u1 ping u2
它给了我:PING u2 (172.18.0.3): 56 data bytes (...)
默认桥接网络不应该有服务发现吗？

Answer 1

默认网桥上的容器需要明确 linked ，这被认为是遗留/弃用的行为。

Warning: The --link flag is a deprecated legacy feature of Docker. It may eventually be removed. Unless you absolutely need to continue using it, we recommend that you use user-defined networks to facilitate communication between two containers instead of using --link. One feature that user-defined networks do not support that you can do with --link is sharing environmental variables between containers. However, you can use other mechanisms such as volumes to share environment variables between containers in a more controlled way.

正如您所演示的那样，应改用用户定义的网络。