Book Image

Production Ready OpenStack - Recipes for Successful Environments

By : Arthur Berezin
Book Image

Production Ready OpenStack - Recipes for Successful Environments

By: Arthur Berezin

Overview of this book

OpenStack is the most popular open source cloud platform used by organizations building internal private clouds and by public cloud providers. OpenStack is designed in a fully distributed architecture to provide Infrastructure as a Service, allowing us to maintain a massively scalable cloud infrastructure. OpenStack is developed by a vibrant community of open source developers who come from the largest software companies in the world. The book provides a comprehensive and practical guide to the multiple uses cases and configurations that OpenStack supports. This book simplifies the learning process by guiding you through how to install OpenStack in a single controller configuration. The book goes deeper into deploying OpenStack in a highly available configuration. You'll then configure Keystone Identity Services using LDAP, Active Directory, or the MySQL identity provider and configure a caching layer and SSL. After that, you will configure storage back-end providers for Glance and Cinder, which will include Ceph, NFS, Swift, and local storage. Then you will configure the Neutron networking service with provider network VLANs, and tenant network VXLAN and GRE. Also, you will configure Nova's Hypervisor with KVM, and QEMU emulation, and you will configure Nova's scheduler filters and weights. Finally, you will configure Horizon to use Apache HTTPD and SSL, and you will customize the dashboard's appearance.
Table of Contents (16 chapters)
Production Ready OpenStack - Recipes for Successful Environments
About the Author
About the Reviewers

Configuring Nova scheduler weights

Nova scheduler first evaluates the configured filters, and it compiles a list of hosts that pass the filters and can be tasked with running the virtual machines instances, after filtering out hosts that don't follow the required capabilities. After Nova scheduler compiles a list of valid candidates to execute the nova request, the scheduler uses weights mechanism to determine which host is the most suitable candidate that executes the request and runs the virtual machine instance. Weights are calculated for each host when a virtual machine instance is to be scheduled, the scheduler calculates host's weight by monitoring resource consumptions of the host. We can set a policy to spread the virtual machine instances across the hosts, or to stack them on a host until resources on that host are exhausted and then schedule virtual machine instances to run on the next best suited host.

Nova scheduler calculates each weight with a configurable multiplier and then...