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The DevOps 2.2 Toolkit
book

The DevOps 2.2 Toolkit

by Viktor Farcic
March 2018
Intermediate to advanced content levelIntermediate to advanced
360 pages
7h 52m
English
Packt Publishing
Content preview from The DevOps 2.2 Toolkit

Updating service constraints

The services we created so far are scheduled without any constraints, apart from those that tie some of the services to one of the Swarm managers.

Without constraints, Swarm will distribute service replicas evenly. It will place them on a node that has fewest containers. Such a strategy can be disastrous. For example, we might end up with Prometheus, ElasticSearch, and MongoDB on the same node. Since all three of them require a fair amount of memory, their performance can deteriorate quickly. At the same time, the rest of the nodes might be running very undemanding services like go-demo. As a result, we can end up with a very uneven distribution of replicas from the resource perspective.

We cannot blame Swarm ...

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Publisher Resources

ISBN: 9781788991278Supplemental Content