Getting Started with Kubernetes InitContainers and Volume pre-population - DEV Community 👩💻👨💻
Other examples of this pattern being useful can be if your application relies on configurations with variable requirements; maybe you're issued a token, or an address is fairly dynamic, and this needs to be passed through files on disk, rather than the environment (i.e. a loadbalancer, or webserver, or database client with a configuration file, not easily handled through a Secret or ConfigMap because of how often they change), this provides a somewhat easily programmable interface for pre-populating or completing the templating of data handed to a container.
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