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Document migration path to ingress-nginx chart from stable/nginx-ingress #6038

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scottrigby
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Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

@k8s-ci-robot k8s-ci-robot added do-not-merge/work-in-progress Indicates that a PR should not merge because it is a work in progress. cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. size/L Denotes a PR that changes 100-499 lines, ignoring generated files. labels Aug 18, 2020
@scottrigby scottrigby force-pushed the migration-from-stable-nginx-ingress branch from 8192f35 to f78693f Compare August 18, 2020 21:16
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aledbf commented Aug 18, 2020

/assign @ChiefAlexander


The following table lists the configurable parameters of the ingress-nginx chart and their default values.
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just remove this section without a replacement?

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Yeah, why was this removed?

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Hey good question – I should have given more context, have been doing this a lot lately trying to prep the move from stable for charts that have been in discussion for a while.

These chart README templates have been copied and re-copied across charts for years, and now that we're moving repos and counting down the days to Helm 2's end of support, it seems like a good time to simplify things.

For this issue, I needed to add an Upgrading section, for the remaining item in #5161 before we can mark the stable/nginx-ingress chart deprecated and point users here. I took the opportunity to make a few other section cleanup changes. Major differences are:

  • Added Helm 2 and Helm 3 commands, with links to Helm 3 command reference links (from there, users can select Helm 2 from the version dropdown if they wish)
  • Removed the options table that's duplicated from (often out of sync with) values.yaml in favor of helm inspect (Helm 2) and helm show values (Helm 3). The values.yaml file is well organized and commented, giving users a much better (and never out of sync) reference to what they can configure.

The rest of the changes I made were capitalization, removing some other duplicated instructions, linking to the better docs now at helm.sh/docs (they were not always this complete in the past when these README templates were initially written), nesting sub-headers (the configuration-related H2s now H3s underneath the "configure" H2, etc).

Related discussion at prometheus-community/helm-charts#14, where we're moving all the prometheus-related charts.

Personally I think it's cleaner this way, but lmk what you think 🙂

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This is great. I had no idea about the helm show values. I see now that is commented down later.

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Removed the options table that's duplicated from (often out of sync with) values.yaml in favor of helm inspect (Helm 2) and helm show values (Helm 3).

Makes sense. +1 from me


Alternatively, a YAML file that specifies the values for the parameters can be provided while installing the chart. For example,
### Migrating from stable/nginx-ingress
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👍

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Just making sure, does thumbs up mean you think this section is good enough to deprecate the stable/nginx-ingress chart? I think the sooner there aren't two locations for users the better. We can still work to improve this, but just checking how you feel for this stage of the plan to officially deprecate stable and move here?

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This section looks reasonable and clear about what to expect


```console
$ helm install ingress-nginx --set controller.extraArgs.v=2
# Helm 2
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@ChiefAlexander makes sense to keep mentioning helm2?

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Technically this chart should support either in its current form. I don't really mind leaving the references until helm 2 is fully dedicated. That or we flip the API version in the chart.yaml to the helm 3 version and just force helm 3 🤷‍♂️

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Helm 2 is still supported until Nov 13th, at which point I was thinking we should just remove those references from the README and docs.

@ChiefAlexander I would love to see moving to chart api v2, but would recommend keeping this v1 chart intact until after the Helm 2 support end date. One fun option could be to start on a v2 chart alongside this one (we just can't have two charts by the same name in the same helm repo index, even if they're two different chart api versions. So it could be named differently until then, or just not added to the repo index until then. Or we could just wait). One really nice feature as of Helm v3.1.0 is the post-renderer flag, which I hope will encourage chart api v2 charts to be dramatically simpler (less if/else logic for every use case within gotemplating) because end users can add their edge cases with a post renderer, so no need to add every use case in the world to ever chart after that. Would love to chat more about this one when you all have time! Thinking it's out of scope for this PR though

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aledbf commented Aug 18, 2020

@scottrigby thank you for working on this 🎉


The following table lists the configurable parameters of the ingress-nginx chart and their default values.
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Yeah, why was this removed?


```console
$ helm install ingress-nginx --set controller.extraArgs.v=2
# Helm 2
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Technically this chart should support either in its current form. I don't really mind leaving the references until helm 2 is fully dedicated. That or we flip the API version in the chart.yaml to the helm 3 version and just force helm 3 🤷‍♂️

@scottrigby scottrigby marked this pull request as ready for review August 19, 2020 00:53
@k8s-ci-robot k8s-ci-robot removed the do-not-merge/work-in-progress Indicates that a PR should not merge because it is a work in progress. label Aug 19, 2020
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/approve

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Oh, wait. We should also bump the chart version before merging this in.

/approve cancel

Signed-off-by: Scott Rigby <[email protected]>
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Damnit lol. Bumped chart PATCH version 👍

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Thanks for putting this together!

/approve

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aledbf commented Aug 19, 2020

/lgtm

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aledbf commented Aug 19, 2020

@scottrigby thanks!

@k8s-ci-robot k8s-ci-robot added the lgtm "Looks good to me", indicates that a PR is ready to be merged. label Aug 19, 2020
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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, ChiefAlexander, scottrigby

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@k8s-ci-robot k8s-ci-robot added the approved Indicates a PR has been approved by an approver from all required OWNERS files. label Aug 19, 2020
@k8s-ci-robot k8s-ci-robot merged commit 6cfab1f into kubernetes:master Aug 19, 2020
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4 participants