February 2019
Intermediate to advanced
240 pages
5h 25m
English
Content preview from Docker for Rails Developers
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Scale Up the Web Service
Currently, we have a single container (or replica) of each service running on our swarm. However, with Swarm, we can scale up services to meet real or anticipated demand. Here we’re talking about horizontally scaling your app—running multiple containers for a service, each of which can handle a certain amount of load.
Ready to try this out? Let’s scale our web service up to run three containers; watch what happens in the visualizer as you run the following command:
| | $ docker service scale myapp_web=3 |
| | myapp_web scaled to 3 |
| | overall progress: 3 out of 3 tasks |
| | 1/3: running [==================================================>] |
| | 2/3: running [==================================================>] |
| | 3/3: running ... |
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.