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Parse TargetGroup names from ARNs #10276

Merged
merged 5 commits into from
Nov 21, 2020
Merged

Parse TargetGroup names from ARNs #10276

merged 5 commits into from
Nov 21, 2020

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hakman
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@hakman hakman commented Nov 20, 2020 •
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Fixes: #10268
Summary of fixes:

  1. duplicate tasks names because the names for external TGs are the same for each IG
  2. model names differ from actual names so always show changes
  3. ordering is required to not show false changes

@k8s-ci-robot k8s-ci-robot added cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. size/M Denotes a PR that changes 30-99 lines, ignoring generated files. labels Nov 20, 2020
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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hakman

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@k8s-ci-robot k8s-ci-robot added area/provider/aws Issues or PRs related to aws provider approved Indicates a PR has been approved by an approver from all required OWNERS files. labels Nov 20, 2020
@hakman hakman added the do-not-merge/work-in-progress Indicates that a PR should not merge because it is a work in progress. label Nov 20, 2020
@k8s-ci-robot k8s-ci-robot added area/api size/L Denotes a PR that changes 100-499 lines, ignoring generated files. and removed size/M Denotes a PR that changes 30-99 lines, ignoring generated files. labels Nov 20, 2020
@hakman hakman removed the do-not-merge/work-in-progress Indicates that a PR should not merge because it is a work in progress. label Nov 20, 2020
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hakman commented Nov 20, 2020

This and other may need back-porting to 1.18 also now.
/cc @rifelpet @rdrgmnzs

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is there anything in the integration tests that we could add that would expose this bug and confirm this fix?

pkg/model/awsmodel/autoscalinggroup.go
tg := &awstasks.TargetGroup{
Name: fi.String(fmt.Sprintf("external-tg-%d", i)),
Name: fi.String(resource[1]),
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This assumes that the ARN field after targetgroup/ is always equal to the target group's name and that AWS never modifies that in anyway. is that a safe assumption?

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I think for now should be ok. AWS will break pretty much anything it wants :).

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For now, in case of TGs, the resource ID is always tg-name/big-number. This PR validates this format so people will know in advance if something is changed in the future.

Technically, tasks are compared by name and ARN. The name is also used for ordering. We could potentially add some logic that detects the external TGs and generates the name is a way that doesn't assume tg-name/big-number, but would complicate things and add assume some fixed names as belonging to kOps. Seems safer to just assume AWS will not change the ARN format for TGs. For sure AWS will not change the ARNs of existing TGs.

@rifelpet rifelpet changed the title Parse TargetGrup names from ARNs Parse TargetGroup names from ARNs Nov 20, 2020
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/lgtm

@k8s-ci-robot k8s-ci-robot added the lgtm "Looks good to me", indicates that a PR is ready to be merged. label Nov 21, 2020
@hakman hakman mentioned this pull request Nov 21, 2020
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@k8s-ci-robot k8s-ci-robot merged commit 4446507 into kubernetes:master Nov 21, 2020
@k8s-ci-robot k8s-ci-robot added this to the v1.20 milestone Nov 21, 2020
k8s-ci-robot added a commit that referenced this pull request Nov 21, 2020
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Merge pull request #10288 from hakman/automated-cherry-pick-of-#10276…
6ac0e17 
…-upstream-release-1.19

Automated cherry pick of #10276: Parse TargetGrup names from ARNs
@hakman hakman deleted the fix-asg branch November 22, 2020 05:31
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Can't generate terraform when using externalLoadBalancers in two IGs
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