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Nditah's Blog

Up and running with docker in 5 minute

Up and running with docker in 5 minute

Setup PostgreSQL database with docker

We use docker at PMT to develop our backend APIs for our transport and logistic applications. Docker greatly improves our productivity by offering a consistent development environment for your entire team; support for multiple stacks, and easy management of development dependencies, and not to mention, ease of deployment.

We develop backend with Java, Rust, Javascript, Elixir, Go, and C++ programming languages together with various database technologies such as Postgresql, MySql, MongoDB, and Noe4j. A typical task we do during development is setting up the development environment (with the database). Docker takes away these repetitive, mundane configuration tasks.

In this article, we will see how to install docker and launch PostgreSQL in five minutes.

1. Go to the official website and download the right version for your machine.

Personally, I use Ubuntu and Snapcraft works for me:

# snapd can be installed from the command line

$ sudo apt update
$ sudo apt install snapd
# use snap to install docker

$ sudo snap install docker

2. Verify that Docker Engine is installed correctly by running the hello-world image.

 sudo docker run hello-world

This command downloads a test image and runs it in a container. When the container runs, it prints an informational message and exits.

3. (download and) launch the docker images. PostgreSQL 13 in my case

docker run -d --name pg13 -p 5432:5432 -e POSTGRES_HOST_AUTH_METHOD=trust postgres:13

4. Connect to the docker container

docker exec -it pg13 /bin/bash

psql -h localhost -U postgres

psql -U postgres -h localhost -p 5432 -c "show server_version" postgres  server_version

#5. Now that you are in the database shell, you can execute SQL commands. Of course, replace mydb, myuser and mypass with the desire database name, database user and user's password (as required in your dot-env file).

sudo -u postgres psql
postgres=# CREATE DATABASE mydb;
postgres=# CREATE USER myuser WITH ENCRYPTED PASSWORD  'mypass';

5. Let’s stop the instance

docker stop pg13

6. And let’s clear any data generated and stored by our instance

docker rm pg13

7. To clean or prune unused (dangling) images

docker image prune

To remove all images which are not in use containers, add - a

docker image prune -a

To Purne your entire system

docker system prune

Download a Docker cheatsheet for more commands at your fingertip.

Thanks for reading and happy coding!

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