Building a python-flask app image with Docker and pushing to Dockerhub using Jenkins CI/CD

• Install python3, pip3 & flask
• $ git clone https://github.com/Lily-G1/docker-flask-demo/
• $ cd docker-flask-demo
• $ python3 app.py
• View application on localhost/IP:8080

• Install Docker
• $ cd docker-flask-demo
• $ docker build -t flask-app . (to build image)
• $ docker run -d -p 8080:8080 flask-app (to run container)
• $ docker stop 'container-ID' (to stop container)

• Install Jenkins on same server. See installation guide here
• On the Jenkins U.I, go to Manage Jenkins -> Credentials -> global -> Add Credentials :
  • Kind = ‘username & password’-> Enter your dockerhub account's username & password respectively
  • Id = ‘dockerhub’
  • Description = ‘dockerhub_credentials’. Save.
• Go to dashboard & create new item (pipeline project) -> Advanced Project Options -> Advanced -> Display Name = ‘Docker-Flask-App’
• Pipeline -> Pipeline SCM (enter github repo details). Save.
• Go to Manage Jenkins -> Manage Plugins -> Install ‘safe restart’ plugin
• On the server's command line:
• $ sudo usermod -a -G docker Jenkins. Log out & Log back in (to give Jenkins access to Docker)
• Restart Jenkins using systemctl on the command line OR via the U.I using 'safe restart'
• Build project
• Check Dockerhub to confirm that image was pushed successfully

• Edit the image name on the Jenkinsfile to your preference