Book Image

Containers in OpenStack

Book Image

Containers in OpenStack

Overview of this book

Containers are one of the most talked about technologies of recent times. They have become increasingly popular as they are changing the way we develop, deploy, and run software applications. OpenStack gets tremendous traction as it is used by many organizations across the globe and as containers gain in popularity and become complex, it’s necessary for OpenStack to provide various infrastructure resources for containers, such as compute, network, and storage. Containers in OpenStack answers the question, how can OpenStack keep ahead of the increasing challenges of container technology? You will start by getting familiar with container and OpenStack basics, so that you understand how the container ecosystem and OpenStack work together. To understand networking, managing application services and deployment tools, the book has dedicated chapters for different OpenStack projects: Magnum, Zun, Kuryr, Murano, and Kolla. Towards the end, you will be introduced to some best practices to secure your containers and COE on OpenStack, with an overview of using each OpenStack projects for different use cases.
Table of Contents (17 chapters)
Title Page
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface

Components


The diagram in the Zun WebSocket proxy section shows the architecture of Zun. Zun has two binaries: zun-api and zun-compute. These two services together carry the whole life cycle of container management of containers. These services interact with other OpenStack services such as Glance for the container images, Cinder for providing volume to the containers, and Neutron for the connectivity between containers and the outside world. The request for containers is finally communicated to the Docker services running on the compute node. Docker then creates the container for the users.

zun-api

zun-api is a WSGI server that serves the users' API requests. For every resource in Zun, there are separate handlers:

  • Container
  • Host
  • Images
  • Zun services

Each of the controllers handle a request for specific resources. They validate the request for permissions, validate the OpenStack resources including validating if the image is present in Docker Hub or Glance, and create a DB object for the resource...