Cloud & Networking
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You're reading from  The DevOps 2.5 Toolkit

Product typeBook
Published inNov 2019
PublisherPackt
ISBN-139781838647513
Edition1st Edition
Tools
Kubernetes
Concepts
DevOps
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Author (1)
Viktor Farcic
Viktor Farcic
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Viktor Farcic

Viktor Farcic is a senior consultant at CloudBees, a member of the Docker Captains group, and an author. He codes using a plethora of languages starting with Pascal (yes, he is old), Basic (before it got the Visual prefix), ASP (before it got the .NET suffix), C, C++, Perl, Python, ASP.NET, Visual Basic, C#, JavaScript, Java, Scala, and so on. He never worked with Fortran. His current favorite is Go. Viktor's big passions are Microservices, Continuous Deployment, and Test-Driven Development (TDD). He often speaks at community gatherings and conferences. Viktor wrote Test-Driven Java Development by Packt Publishing, and The DevOps 2.0 Toolkit. His random thoughts and tutorials can be found in his blog—Technology Conversations
Read more about Viktor Farcic

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The complete HorizontalPodAutoscaler flow of events

Metrics Server is fetching memory and CPU data from Kubelets running on the worker nodes. In parallel, Prometheus Adapter is fetching data from Prometheus Server which, as you already know, pulls data from different sources. Data from both Metrics Server and Prometheus Adapter is combined in Metrics Aggregator.

HPA is periodically evaluating metrics defined as scaling criteria. It's fetching data from Metrics Aggregator, and it does not really care whether they're coming from Metrics Server, Prometheus Adapter, or any other tool we could have used.

Once scaling criteria is met, HPA manipulates Deployments and StatefulSets by changing their number of replicas.

As a result, rolling updates are performed by creating and updating ReplicaSets which, in turn, create or remove Pods.

Figure 5-3: HPA using a combination of...
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The DevOps 2.5 Toolkit
Published in: Nov 2019Publisher: PacktISBN-13: 9781838647513
© 2019 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Viktor Farcic

Viktor Farcic is a senior consultant at CloudBees, a member of the Docker Captains group, and an author. He codes using a plethora of languages starting with Pascal (yes, he is old), Basic (before it got the Visual prefix), ASP (before it got the .NET suffix), C, C++, Perl, Python, ASP.NET, Visual Basic, C#, JavaScript, Java, Scala, and so on. He never worked with Fortran. His current favorite is Go. Viktor's big passions are Microservices, Continuous Deployment, and Test-Driven Development (TDD). He often speaks at community gatherings and conferences. Viktor wrote Test-Driven Java Development by Packt Publishing, and The DevOps 2.0 Toolkit. His random thoughts and tutorials can be found in his blog—Technology Conversations
Read more about Viktor Farcic

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