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DevOps for Networking

You're reading from   DevOps for Networking Bringing Network Automation into DevOps culture

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Product type Paperback
Published in Oct 2016
Publisher
ISBN-13 9781786464859
Length 364 pages
Edition 1st Edition
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Author (1):
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Steven Armstrong Steven Armstrong
Author Profile Icon Steven Armstrong
Steven Armstrong
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Table of Contents (13) Chapters Close

Preface 1. The Impact of Cloud on Networking 2. The Emergence of Software-defined Networking FREE CHAPTER 3. Bringing DevOps to Network Operations 4. Configuring Network Devices Using Ansible 5. Orchestrating Load Balancers Using Ansible 6. Orchestrating SDN Controllers Using Ansible 7. Using Continuous Integration Builds for Network Configuration 8. Testing Network Changes 9. Using Continuous Delivery Pipelines to Deploy Network Changes 10. The Impact of Containers on Networking 11. Securing the Network Index

Load balancing immutable and static infrastructure


With the introduction of public and private cloud solutions such as AWS and OpenStack, there has been a shift towards utilizing immutable infrastructure instead of traditional static servers.

This has raised a point of contention with pets versus cattle or, as Gartner defines it bi-modal (http://www.gartner.com/it-glossary/bimodal/).

Gartner has said that two different strategies need to be adopted, one for new microservices, cattle, and one for legacy infrastructure, pets. Cattle are servers that are killed off once they have served their purpose or have an issue, typically lasting one release iteration. Alternately, pets are servers that will have months or years of uptime and will be patched and cared for by operations staff.

Gartner defines pets as Mode 1 and cattle as Mode 2. It is said that a cattle approach favors the stateless microservice cloud-native applications, whereas a pet, on the other hand, is any application that is a monolith...

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