![]() If the container exposes the port 80, we can run docker run -p 8089:80 image-name. But that ports belong to the container! Since we need to access the container from our localhost, we need to map a local port to one of the ports exposed by the container. Once the container is up and running, it exposes one or more ports (for example, the container for an API may expose port 80). But we haven’t finished yet! Docker containers ports So now we have our container accessible within the machine. docker rm stops and removes the specified container.docker stop stops the specified container.docker ps -a lists all the containers, also the ones stopped.docker ps lists all the containers currently up.docker run creates and runs a container using the specified image.Once you have downloaded an image, you can “build” it to have your container up and running: docker rmi removes the specified image from your machine Ĭontainers are the living versions of an image.docker image ls lists all the downloaded images stored on your machine.docker pull downloads the specified image from Docker Hub.There are few commands to know when working with images: Most of the images are available on DockerHub: this is a library of official images of various types, from databases to frameworks, from operating systems to cache platforms. Do you remember snapshots from the VM world? Well, images are the same for containers: a set of instructions and file system layers that, when executed, allow your container to be alive. ![]() Images are the blueprints that contain all the information to run a container. You can refer to the Getting Started page on the project’s website to know how to download and install it.īut, first, let me introduce the key concepts to know about Docker: images and containers. You’ve probably heard of Docker: it is an open-source project that allows developers to run, create and distribute unit of software in a standardized way it works with containers, that, simplifying a lot, are isolated applications with their own file systems and that can be run anywhere: think of them as VMs, but with a different and lighter underlying structure.įirst of all, you must install Docker on your machine. First of all, I’ll explain what is Docker and what it can do for us then we’ll run MongoDB on a Docker container. The port 80 is exposed to be consulted by devices, web browsers or others microservices.In this article, I’m going to explain how you can try out the functionalities of MongoDB without installing it, but running it on a Docker container. The port 27017 is exposed to be consulted by Robomongo system. Used to lookup booking information for users. This service is used get a list of movies playing on a certain date. It provides the movie title, rating on a 1-10 scale, director and other information. This service is used to get information about a movie. This service returns information about the users of Cinema. Add the following line in your /etc/hosts file: Virtual domains has been defined in docker-compose.yml file and configured in /etc/hosts file. By default we are using: movies.local, bookings.local, users.local and showtimes.local We must add virtual domains in order to use each api entry point. The project structure is based in the knowledge learned in the book: Webĭevelopment with Go by Shiju Varghese, ISBN 978-1-4842-1053-6 Prerequisite The Cinema use case is based on the project written in Python by Umer Mansoor. Booking Service: Provides booking information.Show Times Service: Provides show times information.Movie Service: Provides information like movie ratings, title, etc.Users Service: Provides users information.The Cinema backend is powered by 4 microservices, all of witch happen to be written in Go, using MongoDB for manage the database and Docker to isolate and deploy the ecosystem. ![]() Cinema is an example project which demonstrates the use of microservices for a fictional movie theater.
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