CORS-3849: Enable hosts plugin within the CoreDNS Corefile for cloud platforms

[sadasu]

Update the CoreDNS Corefile for cloud platforms to enable the hosts plugin. the hosts plugin was enabled within the cluster's Corefile specifically for Node addresses. This change enables all enrties within the /etc/hosts file to be loadede and served via the DNS service provided by the cluster's coreDNS instance.

Please note that the hosts plugin was already enabled in the CoreFile for the cluster CoreDNS instance (as opposed to the bootstrap CoreDNS instance). Only some entries were loaded. After this change, all entries from the /etc/hosts file would be loaded and served by CoreDNS.

This feature was requested by ARO but we feel that the hosts plugin should be enabled on all cloud platforms (GCP, AWS and Azure) at all times and not just when run within ARO.

[openshift-ci-robot]

@sadasu: This pull request references CORS-3849 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 story to target the "4.22.0" version, but no target version was set.

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In response to this:

Update the CoreDNS Corefile for cloud platforms to enable the hosts plugin. the hosts plugin was enabled within the cluster's Corefile specifically for Node addresses. This change enables all enrties within the /etc/hosts file to be loadede and served via the DNS service provided by the cluster's coreDNS instance.

Please note that the hosts plugin was already enabled in the CoreFile for the cluster CoreDNS instance (as opposed to the bootstrap CoreDNS instance). Only some entries were loaded. After this change, all entries from the /etc/hosts file would be loaded and served by CoreDNS.

This feature was requested by ARO but we feel that the hosts plugin should be enabled on all cloud platforms (GCP, AWS and Azure) at all times and not just when run within ARO.

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[zaneb]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: sadasu, zaneb
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[sadasu]

/test e2e-gcp-op-ocl

[openshift-ci]

New changes are detected. LGTM label has been removed.

[openshift-ci]

@sadasu: The following test 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/e2e-gcp-op-ocl	3b9e9db	link	true	/test e2e-gcp-op-ocl

Full PR test history. Your PR dashboard.

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