Docker Run Local

• docker-run-local is a lightweight Docker-based local development environment that helps you spin up essential backend services like PostgreSQL, MongoDB, and more — with zero manual setup.

Using docker to run packages locally.

Installing Docker

• Docker GUI is the easiest way to get off the ground.

• You can find instructions to install docker on Installing Docker

• At the end of the installation, you need to make sure you’re able to run the following command -

  docker run hello-world
  

What are we using docker for?

• Docker let’s you do a lot of things.

• It let’s you containerise your applications.

• It let’s you run other people’s code + packages in your machine.

• It let’s you run common software packages inside a container (For eg - Mongo, Postgres etc)

      Window/Mac Machine
       ____________________________________________________
      |                                                    |
      |                                                    |
      |       Container               Container            |
      |       ______________        ______________         |
      |      |              |      |              |        |
      |      |   MongoDB    |      |  Postgres    |        |
      |      |              |      |              |        |
      |      |    27017     |      |    5432      |        |
      |      |______________|      |______________|        |
      |                                                    |
      |____________________________________________________|
  

Where can we get packages from?

• Just like you can push your code to Github/Gitlab.
• You can push images to docker registries

Common commands to know

1. Running an image

• Let’s say you wan’t to run MongoDB locally Docker MongoDB

  docker run mongo

• You will notice you can’t open it in MongoDB Compass

2. Adding a port mapping

• The reason is that you haven’t added a port mapping

  # docker run -p <local_port>:<container_port> mongo
  docker run -p 27017:27017 mongo

3. Running a detached container

• The -d flag will run the container in the background

• This will allow you to run the container and continue using the terminal for other commands.

  docker run -d -p 27017:27017 mongo

4. Inspecting a container

• This will show you all the containers you are running.

  docker ps

5. Stopping a container

• Will stop the container that you are running

  docker kill <container_id>

Common packages

Mongo

docker run -d -p 27017:27017 mongo

• The connection string for this mongo would be

  mongodb://localhost:27017

Postgres

docker run -e POSTGRES_PASSWORD=mysecretpassword -d -p 5432:5432 postgres

• The connection string for this postgres would be

  postgresql://postgres:mysecretpassword@localhost:5432/postgres