Introducing ENV instead of flags for operator's main.go skeleton manifest

[AlmogBaku]

What do you want to happen?

Configuring operators with Environment Variables instead of flags is considered as best practice, especially due to the limitation to provide dynamic configurations over the flags (i.e. Secrets, ConfigMaps, etc.)

Using flags can allow easier extensibility of the scaffold main.go, and compatibility with the 12factor manifest.

In addition, I highly recommend the usage of caarl0s/env repository for simplicity or

Extra Labels

No response

[AlmogBaku]

I don't mind writing a PR if this is an acceptable feature.

[coderanger]

I think you are overstating it that env vars are a best practice. 12factor was an important step in the ops journey for many but it is neither dogma nor overall applicable in a modern setting. I think the more important "best practice" is consistency with all other Kubernetes daemons which use CLI flags rather than env vars. That said, if wanted to introduce Viper to the default skeleton to support both transparently, maybe that would be nice?

[camilamacedo86]

+1 for the @coderanger POV and suggestion.
@AlmogBaku, please feel free to contribute with PRs.

Your help is more than welcome.

[AlmogBaku]

@camilamacedo86, the reason I'm asking is to know if there's an acceptance to the concept since it's a major chunk ;-)

Viper looks good. I haven't known this one :)

[jeesmon]

Isn’t ComponentConfig the approach to solve this problem?

https://book.kubebuilder.io/component-config-tutorial/tutorial.html

https://docs.google.com/document/d/1FdaEJUEh091qf5B98HM6_8MS764iXrxxigNIdwHYW9c/edit#heading=h.yrvizvdexvtq

[coderanger]

the reason I'm asking is to know if there's an acceptance to the concept since it's a major chunk ;-)

It really depends on how much it complicates things. As Jeesmon mentioned, there's potentially some motion towards in-band config via custom objects though that also hasn't gained much traction.

[jmrodri]

label this as support and add to next milestone

[AlmogBaku]

Hey,
Since this is a design feature, let's try to agree upon the design before I'll jump to implementation.

I see that the ComponentConfig was contributed by @pwittrock, are you available on Slack for a brief chat?

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/lifecycle rotten

[AlmogBaku]

@camilamacedo86 should we add it to go/v4 or also for go/v3?

[AlmogBaku]

/remove-lifecycle rotten

[rashmigottipati]

/assign @AlmogBaku

[AlmogBaku]

note: make sure viper can handle one dash arguments as go flags (to support backward compatibility)

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/lifecycle stale

[AlmogBaku]

/remove-lifecycle stale

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/lifecycle stale

[AlmogBaku]

/remove-lifecycle stale

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/lifecycle stale

[AlmogBaku]

/remove-lifecycle stale

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/close not-planned

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

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/close not-planned

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