You can use this repo for build and develop backstage, please hit the star. Thanks!

Backstage

Instructions on How to Deploy Backstage App in Ubuntu 20.04

Note :- Please try this step on freshly installed ubuntu O/S and Clone this repo

7007 is port number for backend 
3000 is port number for frontend

Installing Docker, Nodejs 18, NPM

Note :- Nodejs 16 or 18 version is only support

1. sudo apt install –y docker.io
2. curl -fsSL https://deb.nodesource.com/setup_18.x | sudo -E bash - && sudo apt-get install -y nodejs
    OR
   curl -sL https://deb.nodesource.com/setup_16.x | sudo -E bash -
   sudo apt-get install -y nodejs
3. sudo npm install --global yarn
   npm install -g npm@10.0.0

To verify version

4. node --version
5. yarn --version 
6. nvm --version 
7. npm version (nvm list, which nvm)

To setup/install backstage app

8. npx @backstage/create-app@latest

Go inside the Backstage App

9. cd Backstage-app

Creating a new files inside backstage-app folder

Note :- all this 3 files can be copied/paste from this same repo inside deploy-app folder

10. nano Dockerfile       (we are using from Multi-stage Build Image) 
11. nano app-config.yaml 
12. nano .dockerignore

Running and creating docker image

13. yarn install 
14. yarn build:backend 
15. yarn build-image --tag rashidmd/backstage:1.0.0 
16. docker image build -t rashidmd/backstage:1.0.0 .

Pusing docker image to Docker Hub

17. docker login
18. docker push rashidmd/backstage:1.0.0

UNINSTALL NODEJS, NPM

   1. sudo apt-get remove nodejs 
   2. sudo apt-get remove npm 
   3. sudo rm /etc/apt/sources.list.d/nodesource.list  
   4. sudo rm -rf /home/ubuntu/.npm 
   5. sudo apt purge --autoremove nodejs npm

For Installation in Minikube

1. sudo apt install docker.io
2. sudo usermod -aG docker $USER && newgrp docker
3. curl -LO https://storage.googleapis.com/minikube/releases/latest/minikube_latest_amd64.deb
4. sudo dpkg -i minikube_latest_amd64.deb
5. minikube start
6. kubectl get po -A
7. minikube kubectl -- get po -A
8. alias kubectl="minikube kubectl --"

I have tested above all steps it just deploy backstage app in kubernetes cluster whethers its EKS, AKS, GKE.

HERE IS SCREENSHOT

MohdRashid01/Backstage