I know what you might be thinking come on, not another post explaining what. In practice, there is no difference between exposing a port at runtime or exposing it via an instruction in the Dockerfile. Docker provides the ability to package and run an application in a loosely isolated environment called a container. Due to problems with captive portals and the default Docker IP range I am trying to make Docker use the 198.18.0.0 range, instead of 172.17.0.0, which clashes with the captive portals used on the t.
![docker network create specify ip range docker network create specify ip range](https://www.ionos.com/digitalguide/fileadmin/DigitalGuide/Screenshots_2020/networking-with-docker-2-inspect-network.jpg)
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. The hostname -i displays the IP address of the machine (container) which is 172.17.0.2.We can look at other network configurations of the container using ifconfig command. 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. When we run the container, it will drop us into a shell of the container where we can access various Linux commands.
![docker network create specify ip range docker network create specify ip range](https://cdn.educba.com/academy/wp-content/uploads/2020/12/Docker-network-host.jpg)
It is up to the operator of the container to specify further networking rules. If you do not specify -ip, the VCH assigns an IP address from the range that the vSphere administrator specified in -container-network-ip-range. 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. The IP address that you specify in docker network connect -ip must be within the specified range. Without them, it would be impossible to protect services. The network is an essential part of system/applications/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. In this article, we will learn about the docker compose network. If the interface doesn’t exist, Docker will create it, and assign an IP address to it. These are equivalent commands, though -expose will accept a range of ports as an argument, such as -expose=2000-3000. .channel is how can I change the network range used by Docker. 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.