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DOCKER RUN IMAGE IN BACKGROUND HOW TO
In a future article, we will learn how to perform CRUD operations on a PostgreSQL database using C#. It's just a matter of running a few commands and paying attention to the parameters passed in input.
DOCKER RUN IMAGE IN BACKGROUND INSTALL
In this article, we've seen how to download and install a PostgreSQL database on our local environment by using Docker. I've already introduced Docker in another article, where I explained how to run MongoDB locally:Īs usual, the best resource is the official website:įinally, a special mention to Francesco Ciulla, who thought me how to run Postgres with Docker while I thought him how to query it with C#.
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Remember that the hostname is simply localhost.Īnd we've finished! ? Now you can work with a local instance of Postgres and shut it remove it when you don't need it anymore. There, you can connect to the server by using the environment variable you've defined when running docker run. I prefer the second approach (yes, I know, it's not cool as using the terminal, but it works), so I downloaded pgAdmin. You can work with the DB using the console, or, if you prefer, using a UI. Now that we have Postgres up and running, we can work with it. Always refer to the official docs, specifically to the documentation related to the image version you are consuming. Note: environment variables may change with newer image versions. If you forgot which environment variables you've defined for that container, you can retrieve them using Docker Desktop or by running docker exec myPostgresDb env, as shown below: Do a ls command to list all the images and identify the name and tag. Assuming you have docker images ready for running, let us find out the name and tag of the image that we want to use. Postgres is the name of the image we are using to create the container.Īs a result, you will see the newly created container on the CLI (running docker ps) or view it using some UI tool like Docker Desktop: Docker uses run command to run the image.It takes lots of options and parameters, however in this post we will see the basic things required to run a docker image. This means that the container runs in a background process. d indicates that the container run in a detached mode.
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Of course, we're defining the username and password of the admin user, as well as the name of the database. e POSTGRES_USER=postgresUser, -e POSTGRES_PASSWORD=postgresPW, and -e POSTGRES_DB=postgresDB set some environment variables. In this case, the local 5455 port maps to Docker's 5432 port. Postgres natively exposes the port 5432, and we have to map that port (that lives within Docker) to a local port. name myPostgresDb is the name we assign to the container that we are creating. Docker run is the command used to create and run a new container based on an already downloaded image.