Have you ever wanted to learn Devops, asked "What is Devops" or wanted to start learning DevOps?

This is a minimal viable example of many of the concepts in DevOps which might help you continue to uncover better ways of doing it and help others learn too.

Explore this repo, ask questions and learn

This is a minimal web application with state (database) which:

• ✔️ Automatically generates releases based on semantic version for every merge into the main branch (using intuit/auto)
• 🗄️ Database migrations are version controlled and ran upon app startup
  • This repository uses alembic (python) but you might use alembic/doctrine (php), flyway/liquibase (java) - the concept is the same
• 🔎 When a pull request is opened, a preview application is automatically built, with a url so people can view the proposed new version
• 🔃 When a pull request gets merged into the main branch, the latest application is automatically deployed (using Dokku). (Pipeline Code / UI)
  • You might use Kubernetes with ArgoCD (the underlying concepts are the same)
• 💾 A backup/snapshot of any database is taken pre and post each release
• 🚨 Codebase is regularly automatically scanned for known security issues
• ☸️ At each release a container is built and published to a container registry (Pipeline Code / UI)

cd src python3.9 -m venv venv . venv/bin/activate pip install -r requirements.txt 

Env settings:

cp .env.example .env 

cd src . venv/bin/activate export FLASK_APP=minimalcd export FLASK_DEBUG=1 flask run 

http://127.0.0.1:5000

podman build -t minimalcd -f src/Dockerfile 

podman run -p 8082:80 minimalcd 

(almost) Everything below this point are instructions if you wanted to set this up yourself from scratch

APP_NAME=<app-name> DOKKU_SERVER_IP=<dokku-server-ip> DOKKU_USERNAME=<username> git remote add dokku $DOKKU_USERNAME@$DOKKU_SERVER_IP:$APP_NAME git remote -v show ssh $DOKKU_USERNAME@$DOKKU_SERVER_IP -C dokku apps:create $APP_NAME ssh $DOKKU_USERNAME@$DOKKU_SERVER_IP -C dokku git:initialize $APP_NAME ssh $DOKKU_USERNAME@$DOKKU_SERVER_IP -C dokku builder:set minimalcd build-dir src git push dokku main 

APP_NAME=minimalcd DOKKU_SERVER_IP=192.168.1.10 DOKKU_USERNAME=dokku git remote add dokku $DOKKU_USERNAME@$DOKKU_SERVER_IP:$APP_NAME git remote -v show ssh $DOKKU_USERNAME@$DOKKU_SERVER_IP -C dokku apps:create $APP_NAME ssh $DOKKU_USERNAME@$DOKKU_SERVER_IP -C dokku git:initialize $APP_NAME ssh $DOKKU_USERNAME@$DOKKU_SERVER_IP -C dokku builder-dockerfile:set $APP_NAME dockerfile-path src/Dockerfile git push dokku main 

curl -L https://github.com/intuit/auto/releases/download/v10.36.5/auto-linux.gz > auto-linux.gz gunzip auto-linux.gz chmod +x auto-linux ./auto-linux init # follow on-screen ./auto-linux create-labels 

ssh $DOKKU_USERNAME@$DOKKU_SERVER_IP -C dokku apps:destroy --force $APP_NAME 

Dokku by default expects your Dockerfile to be in the root directory, and the default working directory is the root of the repo.

For changing the name/location of the Dockerfile, you can use the builder-dockerfile:set:

ssh $DOKKU_USERNAME@$DOKKU_SERVER_IP -C dokku builder-dockerfile:set $APP_NAME dockerfile-path Dockerfile 

For changing the working directory of the docker build context, use:

ssh $DOKKU_USERNAME@$DOKKU_SERVER_IP -C dokku builder:set minimalcd build-dir src 

See dokku/dokku#4502 for more details.

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