Download pdf - Building and Deploying containerized Python Apps in the Cloud

Building and Deploying containerized Python Apps in the Cloud

Rodolfo CarvalhoSoftware Engineer

Mar 12th, 2016

Rodolfo Carvalho, PyCon SK 20162

Shipping Apps

Background Wiring Components Together

Rinse & RepeatCreating Containers


Background

Manual Automated


Techniques & Practices

● Sprints● Automated Tests● TDD

● Continuous Integration● Continuous Deployment


Tools

● Ansible● Yum / DNF● IaaS

● Pip● PaaS● Docker


Docker

● “Docker allows you to package an application with all of its dependencies into a standardized unit”

● “Docker containers wrap up a piece of software in a complete filesystem that contains everything it needs to run: code, runtime, system tools, system libraries – anything you can install on a server. This guarantees that it will always run the same, regardless of the environment it is running in.”

Creating Containers


Containers & Images


Minimal Web App and Dockerfile


docker build -t hello .docker build -t hello .


Image Considerations 1/2

● Base Image● Proper usage of layers● Default user & permissions● Other defaults:

● Exposed ports● Work directory● Entrypoint / Cmd


Image Considerations 2/2

● Install dependencies● System● Language

● Reuse


Source-To-Imagegithub.com/openshift/source-to-image


s2i build . centos/python-34-centos7 hello-s2is2i build . centos/python-34-centos7 hello-s2i


OpenShift Builds

Wiring Components Together


More Apps


oc new-appoc new-app


OpenShift Templates

Rinse & Repeat

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