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Merge pull request #28931 from sftim/20210713_revise_kubernetes_1.21_api_removals_article 

Revise API removal article
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Kubernetes Prow Robot 2021-07-13 18:40:27 -07:00 committed by GitHub
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content/en/blog/_posts/2021-07-14-upcoming-changes-in-kubernetes-1-22/index.md
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@ -38,6 +38,9 @@ API versions.
* The beta `Lease` API (**coordination.k8s.io/v1beta1**)
* All beta `Ingress` APIs (the **extensions/v1beta1** and **networking.k8s.io/v1beta1** API versions)
The Kubernetes documentation covers these
[API removals for v1.22](/docs/reference/using-api/deprecation-guide/#v1-22) and explains
how each of those APIs change between beta and stable.
## What to do
@ -96,10 +99,11 @@ and explain the steps you'll need to take.
: Migrate to use the **authentication.k8s.io/v1** [TokenReview](/docs/reference/kubernetes-api/authentication-resources/token-review-v1/)
API, available since v1.10.
In Kubernetes version v1.21 and earlier, the Kubernetes API server
[defaults](/docs/reference/access-authn-authz/authentication/#webhook-token-authentication)
to sending _beta_ TokenReviews to webhooks. See [Rehearse for the upgrade](#rehearse-for-the-upgrade)
for some specific tips about switching to the stable API.
As well as serving this API via HTTP, the Kubernetes API server uses the same format to
[send](/docs/reference/access-authn-authz/authentication/#webhook-token-authentication)
TokenReviews to webhooks. The v1.22 release continues to use the v1beta1 API for TokenReviews
sent to webhooks. See [Looking ahead](#looking-ahead) for some specific tips about
switching to the stable API.
`SubjectAccessReview`, `SelfSubjectAccessReview` and `LocalSubjectAccessReview`
: Migrate to use the **authorization.k8s.io/v1** versions of those
@ -150,7 +154,10 @@ removals before you upgrade to Kubernetes v1.22.
To do that, add the following to the kube-apiserver command line arguments:
`--runtime-config=admissionregistration.k8s.io/v1beta1=false,apiextensions.k8s.io/v1beta1=false,apiregistration.k8s.io/v1beta1=false,authentication.k8s.io/v1beta1=false,authorization.k9s.io/v1=false,certificates.k8s.io/v1beta=false,coordination.k8s.io/v1beta1=false,extensions/v1beta1/ingresses=false,networking.k8s.io/v1beta1/ingresses=false,networking.k8s.io/v1beta1/ingressclasses=false`
`--runtime-config=admissionregistration.k8s.io/v1beta1=false,apiextensions.k8s.io/v1beta1=false,apiregistration.k8s.io/v1beta1=false,authentication.k8s.io/v1beta1=false,authorization.k9s.io/v1=false,certificates.k8s.io/v1beta=false,coordination.k8s.io/v1beta1=false,extensions/v1beta1/ingresses=false,networking.k8s.io/v1beta1=false`
(as a side effect, this also turns off v1beta1 of EndpointSlice - watch out for
that when you're testing).
Once you've switched all the kube-apiservers in your cluster to use that setting,
those beta APIs are removed. You can test that API clients (`kubectl`, deployment
@ -158,16 +165,6 @@ tools, custom controllers etc) still work how you expect, and you can revert if
you need to without having to plan a more disruptive downgrade.
There's another setting that's relevant if you use webhook authentication checks.
Kubernetes v1.22 is the first version of Kubernetes that sends TokenReview objects
to webhooks using the `authentication.k8s.io/v1` API by default. However, you can
switch over earlier to try it out.
Add `--authentication-token-webhook-version=v1` to the command line options for
the kube-apiserver, and check that webhooks for authentication still work how you
expected.
Once you're happy it works, you can leave the `--authentication-token-webhook-version=v1`
option set through and after the upgrade to v1.22.
### Advice for software authors
@ -237,9 +234,23 @@ are documented.
### Looking ahead
The upcoming **v1.25** release will stop serving beta versions of several Kubernetes APIs
that have been stable for some time. The same release **removes** PodSecurityPolicy,
which is deprecated and won't graduate to stable. See
There's a setting that's relevant if you use webhook authentication checks.
A future Kubernetes release will switch to sending TokenReview objects
to webhooks using the `authentication.k8s.io/v1` API by default. At the moment,
the default is to send `authentication.k8s.io/v1beta1` TokenReviews to webhooks,
and that's still the default for Kubernetes v1.22.
However, you can switch over to the stable API right now if you want:
add `--authentication-token-webhook-version=v1` to the command line options for
the kube-apiserver, and check that webhooks for authentication still work how you
expected.
Once you're happy it works OK, you can leave the `--authentication-token-webhook-version=v1`
option set across your control plane.
The **v1.25** release that's planned for next year will stop serving beta versions of
several Kubernetes APIs that are stable right now and have been for some time.
The same v1.25 release will **remove** PodSecurityPolicy, which is deprecated and won't
graduate to stable. See
[PodSecurityPolicy Deprecation: Past, Present, and Future](/blog/2021/04/06/podsecuritypolicy-deprecation-past-present-and-future/)
for more information.