A minimalistic example of an image processing web app accessing a PostgreSQL [1] database and a minio object store written in Go [2]. For each incoming image a message is posted to a RabbitMQ [5] message queue.

This application is part of an exam for the free anynines Kubernetes Training.

This code contains refactoring challenges for the training participants. It implements the "happy path" - there is little to no error handling - and thus is rather fragile.

go mod init github.com/fischerjulian/irmgard

Assumptions:

• RabbitMQ is available via local network
• PostgreSQL is available via local network

Assuming there is a PostgreSQL server running with a user postgres and an empty database postgresl:

POSTGRES_HOST=<postgresql-host> POSTGRES_USERNAME=<postgresql-username> POSTGRES_PASSWORD=<postgresl-password> go run main.go

e.g.

POSTGRES_HOST=localhost POSTGRES_USERNAME=postgres POSTGRES_PASSWORD=xxx go run main.go

TODO Create a Dockerfile and build a container image. As a hint, the workflow of creating a Docker container image is stated below.

docker image build -t irmgard:0.3.0 .

docker image tag irmgard:0.3.0 fischerjulian/irmgard:0.3.0

docker image push fischerjulian/irmgard:0.3.0                                   

docker image pull fischerjulian/irmgard:0.3.0

In order to run the image you will also have to set the env vars POSTGRES_HOST and POSTGRES_PASSWORD which is not contained in the examples below as the images will be used in the context of Kubernetes, only.

Run local image with version tag 0.3.0:

docker container run -p 8080:8080 irmgard:0.3.0

Run remote image with version tag 0.3.0:

docker container run -p  8080:8080 fischerjulian/irmgard:0.3.0

curl -F 'image=@/Users/jfischer/Downloads/000d8ea8207c6d7dae321da11083a312.jpg' localhost:8080

1. PostgreSQL, https://www.postgresql.org/
2. Go, https://golang.org/
3. Go PQ, https://github.com/lib/pq
4. RabbitMQ, https://www.rabbitmq.com/
5. RabbitMQ Go Introduction, https://www.rabbitmq.com/tutorials/tutorial-one-go.html