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keps/../kubeadm: 4214: revisit test plan and risks/mitigations #4302

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neolit123
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@neolit123 neolit123 commented Oct 19, 2023

Update notes about Risk and Mitigations:

  • As a mistaken existing implementation detail "admin.conf" is not shared across control plane nodes, by using the "kubeadm-certs" Secret. Instead on "kubeadm join --control-plane" a new "admin.conf" is signed by using the shared in "kubeadm-certs" CA.
  • Re-place upgrade clusters must apply the "kubeadm:cluster-admins" ClusterRoleBinding if they wish the "admin.conf" files on joining control plane nodes to have "cluster-admin" level access.

Update Test Plan:

@k8s-ci-robot k8s-ci-robot added the cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. label Oct 19, 2023
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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: neolit123

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@k8s-ci-robot k8s-ci-robot added kind/kep Categorizes KEP tracking issues and PRs modifying the KEP directory sig/cluster-lifecycle Categorizes an issue or PR as relevant to SIG Cluster Lifecycle. approved Indicates a PR has been approved by an approver from all required OWNERS files. size/M Denotes a PR that changes 30-99 lines, ignoring generated files. labels Oct 19, 2023
Update notes about Risk and Mitigations:
- As a mistaken existing implementation detail "admin.conf"
is not shared across control plane nodes, by using the "kubeadm-certs"
Secret. Instead on "kubeadm join --control-plane" a new "admin.conf"
is signed by using the shared in "kubeadm-certs" CA.
- Re-place upgrade clusters must apply the "kubeadm:cluster-admins"
ClusterRoleBinding if they wish the "admin.conf" files on joining
control plane nodes to have "cluster-admin" level access.

Update Test Plane:
- Don't add integration tests, instead add an e2e test using kinder
that will do kubeadm init/join/upgrade and verify certificates
stored in kubeconfig files nad RBAC.
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Re-place upgrade clusters must apply the "kubeadm:cluster-admins" ClusterRoleBinding if they wish the "admin.conf" files on joining control plane nodes to have "cluster-admin" level access.

i pinged the #cluster-api slack about this:
https://kubernetes.slack.com/archives/C8TSNPY4T/p1697710479089779

@neolit123 neolit123 requested review from pacoxu, chendave and SataQiu and removed request for justinsb and fabriziopandini October 19, 2023 10:18
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/lgtm
/hold

feel free to cancel hold

@k8s-ci-robot k8s-ci-robot added the do-not-merge/hold Indicates that a PR should not merge because someone has issued a /hold command. label Oct 19, 2023
@k8s-ci-robot k8s-ci-robot added the lgtm "Looks good to me", indicates that a PR is ready to be merged. label Oct 19, 2023
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/hold cancel

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3 participants