RFE-4145: Support custom list of services to be added to /etc/hosts by Node resolver

[t-cas]

Today, node-resolver daemonset in openshift-dns-operator namespace is referencing a SERVICES environment variable allowing to update /etc/hosts of all nodes of the cluster with entries for custom services of the platform, so it can be targeted directly from nodes. This allow the nodes to have access to internal openshift registry directly using DNS entry image-registry.openshift-image-registry.svc
Only issue is that this value for SERVICES env variable is harcoded in cluster-dns-operator code, so it does not allow to reference other services available also at node level.

This PR update DNS operator.openshift.io custom resource and associated controller to support a list of openshift services so they will be added automatically in /etc/hosts and available on all cluster nodes.

This is tracked by RFE-4145

[openshift-ci-robot]

@t-cas: This pull request references RFE-4145 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the feature request to target the "4.20.0" version, but no target version was set.

In response to this:

Today, node-resolver daemonset in openshift-dns-operator namespace is referencing a SERVICES environment variable allowing to update /etc/hosts of all nodes of the cluster with entries for custom services of the platform, so it can be targeted directly from nodes. This allow the nodes to have access to internal openshift registry directly using DNS entry image-registry.openshift-image-registry.svc
Only issue is that this value for SERVICES env variable is harcoded in cluster-dns-operator code, so it does not allow to reference other services available also at node level.

This PR update DNS operator.openshift.io custom resource and associated controller to support a list of openshift services so they will be added automatically in /etc/hosts and available on all cluster nodes.

This is tracked by RFE-4145

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[openshift-ci]

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[openshift-ci]

Hi @t-cas. Thanks for your PR.

I'm waiting for a openshift member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[candita]

@t-cas thanks for your contribution. There are two issues here. First, the RFE has not been accepted, and second, you will need to make OpenShift API changes in github.com/openshft/api and vendor them instead of directl editing vendor/github.com/openshift/api/operator/v1/types_dns.go

/hold

[t-cas]

@candita thanks for your feedback, api change done in this PR openshift/api#2435 as requested

The change is rather small, and it is here already implemented and tested, how can we move forward with RFE ?

[sdodson]

@candita Will this ensure that the list, assuming items aren't changing, are in a stable order or do we need to sort them to prevent churn?

[sdodson]

/test verify-deps

[sdodson]

/test verify

[openshift-ci]

@t-cas: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/verify-deps	4bc22ff	link	true	/test verify-deps
ci/prow/verify	4bc22ff	link	true	/test verify

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.

[candita]

@t-cas @sdodson just an update - decision needs to wait until our team lead is back from PTO next week. However, just to set expectations, we do have higher priority items for review.

[candita]

/assign @Miciah
/assign @alebedev87

[candita]

@t-cas please investigate the failing verify/verify-deps test before review.