July 2018
Intermediate to advanced
504 pages
11h 34m
English
Content preview from Learn OpenShift
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Separating configuration from application code using ConfigMaps
The ConfigMap resource is used to separate data from a pod running an application. These kinds of resource contain arbitrary data to be injected into a pod as configuration. Injection in this context means that the pod can use it in the following ways:
- Export its key/value pairs as environment variables
- Supply its values as command-line arguments to the application
- Mount it as a volume inside the pod to the location where the application expects to find its configuration file
Before you begin, make sure you are logged in as an unprivileged user for the most representative experience:
# oc login -u alice
Let's look at the process of exporting ConfigMap as an environment variable ...
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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.