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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

Scaling nodes when replica state is pending

A replica of a service might be in the pending state. There might be quite a few reasons for that, and we won't go through all of them. Instead, we'll explore one of the most common causes behind having a replica pending deployment. A service might have memory reservation that cannot be fulfilled with the current cluster.

Let's say that a service has memory reservation set to 3 GB. All the replicas of that service are running but, at one moment, the system scales that service by increasing the number of replicas by one. What happens if none of the nodes have 3 GB of unreserved memory? Docker Swarm will set the status of the new replica to pending, hoping that 3 GB will be available in the future. ...

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Publisher Resources

ISBN: 9781788991278Supplemental Content