May 2018
Beginner to intermediate
160 pages
3h 45m
English
Content preview from Deploying to OpenShift
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Chapter 14. Working with Persistent Storage
When an application is run inside a container, it has access to its own filesystem. This contains a copy of the operating system files from the image, any application server or language runtime files, as well as the source code or compiled binary for the application being run.
When the application is running, it can write files to any part of the filesystem it has permission to write to, but when the container is stopped, any changes made will be lost. This is because the local container filesystem is ephemeral.
In order to preserve data created by an application across restarts of the application, or share dynamic data between instances of an application, persistent storage is required. This may be persistent storage that is attached directly to a container the application is running in, or persistent storage attached to a separate database running in OpenShift that the application is using.
In this chapter, you will learn about persistent storage provided by OpenShift, how to make a persistent volume claim, and how to mount the persistent volume into the container for an application.
Types of Persistent Storage
When an OpenShift cluster is set up, it will be configured for persistent storage by the cluster admin. The persistent volumes available may be pre-allocated from fixed storage, or a dynamic storage provisioner can be set up with persistent volumes being allocated on demand from a persistent storage provider.
OpenShift supports ...
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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.