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You're reading from  Learn Docker - Fundamentals of Docker 19.x - Second Edition

Product typeBook
Published inMar 2020
PublisherPackt
ISBN-139781838827472
Edition2nd Edition
Tools
Docker
Concepts
Containerization
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Author (1)
Dr. Gabriel N. Schenker
Dr. Gabriel N. Schenker
author image
Dr. Gabriel N. Schenker

Dr. Gabriel N. Schenker has more than 25 years of experience as an independent consultant, architect, leader, trainer, mentor, and developer. Currently, Gabriel works as Lead Solution Architect at Techgroup Switzerland. Prior to that, Gabriel worked as Lead Curriculum Developer at Docker and at Confluent. Gabriel has a Ph.D. in Physics, and he is a Docker Captain, a Certified Docker Associate, a Certified Kafka Developer and Operator, and an ASP Insider. When not working, Gabriel enjoys time with his wonderful wife Veronicah and his children.
Read more about Dr. Gabriel N. Schenker

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Scaling a service

Now, let's, for a moment, assume that our sample application has been live on the web and become very successful. Loads of people want to see our cute animal images. So now we're facing a problem, since our application has started to slow down. To counteract this problem, we want to run multiple instances of the web service. With Docker Compose, this is readily done.

Running more instances is also called scaling up. We can use this tool to scale our web service up to, say, three instances:

$ docker-compose up --scale web=3

If we do this, we are in for a surprise. The output will look similar to the following screenshot:

Output of docker-compose --scale

The second and third instances of the web service fail to start. The error message tells us why: we cannot use the same host port 80 more than once. When instances 2 and...

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Learn Docker - Fundamentals of Docker 19.x - Second Edition
Published in: Mar 2020Publisher: PacktISBN-13: 9781838827472
© 2020 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Dr. Gabriel N. Schenker

Dr. Gabriel N. Schenker has more than 25 years of experience as an independent consultant, architect, leader, trainer, mentor, and developer. Currently, Gabriel works as Lead Solution Architect at Techgroup Switzerland. Prior to that, Gabriel worked as Lead Curriculum Developer at Docker and at Confluent. Gabriel has a Ph.D. in Physics, and he is a Docker Captain, a Certified Docker Associate, a Certified Kafka Developer and Operator, and an ASP Insider. When not working, Gabriel enjoys time with his wonderful wife Veronicah and his children.
Read more about Dr. Gabriel N. Schenker

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