![]() In practice, there is no difference between exposing a port at runtime or exposing it via an instruction in the Dockerfile. ![]() Remember that we also placed the Basic HTTP authentication credentials in this folder. As explained previously, I use the shared folder to share some common information between various services. More on these later in this Traefik 2 docker guide. Essentially, EXPOSE or -expose is just metadata that provides information to be used by another command, or to inform choices made by the container operator. docker network create -gateway 192.168.90.1 -subnet 192.168.90.0/24 t2proxy. Used in conjunction with the -P flag, which I'll get to a bit later in this article, this strategy for documenting ports via the EXPOSE command can be very useful. It is up to the operator of the container to specify further networking rules. ![]() Given the limitation of the EXPOSE instruction, a Dockerfile author will often include an EXPOSE rule only as a hint to which ports will provide services. However, neither EXPOSE nor -expose depend on the host in any way these rules don't make ports accessible from the host by default. These are equivalent commands, though -expose will accept a range of ports as an argument, such as -expose=2000-3000. You can expose a port in two ways: either in the Dockerfile with the EXPOSE instruction, or in the docker run string with -expose=1234.
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