It’s frustrating. When you put EXPOSE 80 (or any port you want) in your Dockerfile that’s going to tell Docker that your container’s service can be connected to on port 80. I specify the port bindings in the docker-compose-build.yml, but when I run docker-compose, and docker-ps there is no listing for any ports, nor can I hit them with Postman. A Docker container contains everything it needs to function and nothing more. Docker has almost 4 years now.

You can also tell Docker which IP to bind on. If you don’t have an idea, grab yourself a cup of coffee. I was born in Bangladesh. In the src/ directory, all the source code of my NodeJS application will be kept.. If you don’t know what a UUID is, read all about it in Now if you try to connect directly to the Docker container using Docker containers can connect to the outside world without any configuration. At universities or schools, they most likely don’t even teach you anything about Docker. I’ll show you the result of the curl command.Let me also show you how this would look in your browser if you visited 0.0.0.0:8080.By default, Docker exposes container ports to the IP address 0.0.0.0 (this matches any IP on the system). And it will only take you six minutes!Don’t worry if you only know a bit about Docker. In this directory, you should keep all the project files and a Run the following command to create a project directory Run the following command to create a Docker container That’s basically how you expose certain ports in your custom Docker images you will be building using In the earlier section of this article, I showed you how to expose a TCP port using a You can easily expose a TCP port (let’s say TCP port You can also expose an UDP port (Let’s say UDP port You can expose TCP and UDP port at the same time with the following lines in your If you don’t specify what protocol (TCP or UDP) to use, TCP is used by default.
Let’s explore them.That sounds nice, but how am I supposed to find this port now? I guess I’ll just install it, right?You end up with a lot of different programs and often need to configure system variables, etc. Otherwise, you can look silly during a job interview.

This option is a bit confusing to some, but it allows the individual who is generating the Docker container to specify a network port the individual can use to interact with the container. This will bind the exposed port to your Docker host on a random port (verified by running docker container ls). Have a look at the So when your nodejs app container tries to connect to the 6379 port of the redis container, the EXPOSE instruction is what makes this possible.docker run -p : IMAGE_NAMEI don’t think there’s any need to use the EXPOSE instruction in your own Dockerfile if the docker image is simply a web app. To start using docker and building docker images, the only thing we need is a Dockerfile (and of course, docker itself).I have seen lot of developers getting confused in understanding what it exactly means.The EXPOSE instruction informs Docker that the container listens on the specified network ports at runtime. It is really easy to create a custom Docker image from existing Docker images using EXPOSE does not make the ports of the container accessible to the host.Let’s say we have two containers, a nodejs application and a redis server. Docker port binding is an important concept to understand if you’re working with containers.

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