Support dual stack IPv4 & IPv6 networking

[miff2000]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:

This adds functionality to Kubespray to support dual stack deployments (IPv4 & IPv6 combined)

Which issue(s) this PR fixes:

Fixes #6791

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Support for dual stack (IPv4 & IPv6) network deployment using Calico is introduced as an opt-in feature.

[k8s-ci-robot]

Hi @miff2000. Thanks for your PR.

I'm waiting for a kubernetes-sigs 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.

I understand the commands that are listed here.

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/test-infra repository.

[k8s-ci-robot]

@miff2000: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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/test-infra repository.

[miff2000]

@holmsten, would you be able to take a look this PR please?

[EppO]

/ok-to-test

[miff2000]

Hey guys, is anyone able to give this a review or merge into a release? @ant31, @EppO are you able to help?

[LuckySB]

1. It is necessary to check the choice of CNI Calico when enable_dual_stack_networks: true
   Please add asserts task to preinstall role 0020-verify-settings

2. Tests are needed. I suggest adding enable_dual_stack_networks: true to at least one of the tests packet_centos7-calico-ha

[miff2000]

On a side note, to use dual stack networking, you need to have this set:

kube_feature_gates:
  - IPv6DualStack=true

Do you think I should just add a node into the documentation, or try and set them automatically for the user, working with the #6851 changes?

[champtar]

Do we want to set /label tide/merge-method-rebase ? (rebase instead of squash)

[miff2000]

Do we want to set /label tide/merge-method-rebase ? (rebase instead of squash)

Sure! I didn't know that was a thing, but would usually prefer a rebase too. Can I do that myself?

[champtar]

Yes

[miff2000]

/label tide/merge-method-rebase

[k8s-ci-robot]

@miff2000: The /retest command does not accept any targets.
The following commands are available to trigger jobs:

• /test pull-kubespray-yamllint

Use /test all to run all jobs.

In response to this:

/retest vagrant_ubuntu18-flannel

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/test-infra repository.

[miff2000]

Are we ready for an LGTM now do you think?
@EppO @LuckySB

[EppO]

/lgtm

[oomichi]

/lgtm

[floryut]

/approve
Really good work @miff2000 👍

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, miff2000

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [floryut]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment