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I want to inject an init container into some pods. I know how to specify init containers in a pod's spec, but I don't want to do that directly because these sidecars are invisible to my engineers.

I don't want to go through the complexity of developing my own mutating web hook or operator, so does anyone know of a good package/service that can help?

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Tumblr and Salesforce have open sourced their generic injectors:

Both of these should fit your simple use case but offer a lot more.

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Answering my own question here. Eventually, I went with OpenKruise, which is a pretty simple but cool open-source framework for, amongst other things, creating a centralised way of managing sidecars and init-containers in a cluster, without needing to concern application developers.

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