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You're reading from  Getting Started with Kubernetes, Second Edition - Second Edition

Product typeBook
Published inMay 2017
PublisherPackt
ISBN-139781787283367
Edition2nd Edition
Tools
Kubernetes
Concepts
System Administration
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Author (1)
Jonathan Baier
Jonathan Baier
author image
Jonathan Baier

Jonathan Baier is an emerging technology leader living in Brooklyn, New York. He has had a passion for technology since an early age. When he was 14 years old, he was so interested in the family computer (an IBM PCjr) that he pored over the several hundred pages of BASIC and DOS manuals. Then, he taught himself to code a very poorly-written version of Tic-Tac-Toe. During his teenage years, he started a computer support business. Throughout his life, he has dabbled in entrepreneurship. He currently works as Senior Vice President of Cloud Engineering and Operations for Moody's corporation in New York.
Read more about Jonathan Baier

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Scaling a cluster

All these techniques are great for the scaling of the application, but what about the cluster itself. At some point, you will pack the nodes full and need more resources to schedule new pods for your workloads.

Autoscaling

When you create your cluster, you can customize the starting number of nodes (minions) with the NUM_MINIONS environment variable. By default, it is set to 4.

Additionally, the Kubernetes team has started to build autoscaling capability into the cluster itself. Currently, this is the only support on GCE and GKE, but work is being done on other providers. This capability utilizes the KUBE_AUTOSCALER_MIN_NODES, KUBE_AUTOSCALER_MAX_NODES, and KUBE_ENABLE_CLUSTER_AUTOSCALER environment variables.

The following example shows how to set the environment variables for autoscaling before running kube-up.sh:

$ export NUM_MINIONS=5
$ export KUBE_AUTOSCALER_MIN_NODES=2
$ export KUBE_AUTOSCALER_MAX_NODES=5
$ export KUBE_ENABLE_CLUSTER_AUTOSCALER=true

Also, bear in mind...

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Getting Started with Kubernetes, Second Edition - Second Edition
Published in: May 2017Publisher: PacktISBN-13: 9781787283367
© 2017 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Jonathan Baier

Jonathan Baier is an emerging technology leader living in Brooklyn, New York. He has had a passion for technology since an early age. When he was 14 years old, he was so interested in the family computer (an IBM PCjr) that he pored over the several hundred pages of BASIC and DOS manuals. Then, he taught himself to code a very poorly-written version of Tic-Tac-Toe. During his teenage years, he started a computer support business. Throughout his life, he has dabbled in entrepreneurship. He currently works as Senior Vice President of Cloud Engineering and Operations for Moody's corporation in New York.
Read more about Jonathan Baier

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