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Update to reflect Alejandro's information about IPv6 and GKE
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Signed-off-by: Flynn <[email protected]>
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kflynn committed Jun 8, 2024
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author: 'flynn'
date: 2024-06-06T00:00:00Z
title: |-
Linkerd Edge Release Roundup: May 2024
Linkerd Edge Release Roundup: June 2024
url:
/2024/06/06/linkerd-edge-release-roundup/
thumbnail: '/uploads/2023/06/roundup-clocks-square.png'
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---

{{< fig
alt="May 2024 Linkerd Edge Release Roundup"
alt="June 2024 Linkerd Edge Release Roundup"
src="/uploads/2023/06/roundup-clocks-rect.png" >}}

Welcome to the May 2024 Edge Release Roundup post, where we dive into the most
recent edge releases to help keep everyone up to date on the latest and
greatest! This month, we're covering the May 2024 releases from `edge-24.5.5`
back to `edge-24.5.1` -- there's a lot here so we'll get right into it.
Welcome to the June 2024 Edge Release Roundup post, where we dive into the
most recent edge releases to help keep everyone up to date on the latest and
greatest!

## How to give feedback

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## Recommendations and breaking changes

We recommend `edge-24.5.5` instead of `edge-24.5.4` because `edge-24.5.4`
switches IPv6 to off by default for the control plane, but mistakenly left it
defaulted to on for the Linkerd CNI plugin.
We recommend `edge-24.5.5` for anyone considering an `edge-24.5.*` release; it
has important fixes for the Linkerd CNI plugin on GKE. `edge-24.5.1` is
specifically **not** recommended for users of GKE, due to a bug with the
default Linkerd configuration in that release.

In `edge-24.5.1`, the `patchs` metric introduced in `edge-24.3.4` is renamed to `patches`.
Starting in `edge-24.5.1`, the `patchs` metric introduced in `edge-24.3.4` is
renamed to `patches`.

Finally, starting in `edge-24.5.2`, Linkerd will install the GRPCRoute CRD in
the `gateway.networking.k8s.io` API group, in preparation for later GRPCRoute
Expand All @@ -70,13 +71,14 @@ release notes for each release.

### [`edge-24.5.5`](https://github.com/linkerd/linkerd2/releases/tag/edge-24.5.5) (May 31, 2024)

This release makes `linkerd-cni` default to _not_ supporting IPv6, to match
the rest of the control plane. Set `disableIPv6` to `false` to enable IPv6 in
the CNI.
This release switches IPv6 off by default for the entire control plane,
including the Linkerd CNI plugin. Set `disableIPv6` to `false` to enable IPv6.

### [`edge-24.5.4`](https://github.com/linkerd/linkerd2/releases/tag/edge-24.5.4) (May 23, 2024)

_We recommend [`edge-24.5.5`] instead of this release since this release mistakenly leaves IPv6 defaulted to on for the CNI plugin._
_We recommend [`edge-24.5.5`] instead of this release. In this release, IPv6
support is off by default for most of the control plane, but it is mistakenly
on by default for the Linkerd CNI plugin._

This release adds support for JSON output to the `linkerd inject`, `linkerd
uninject` and `linkerd profile` commands, and a `--token` flag to `linkerd
Expand All @@ -95,12 +97,19 @@ fixes intermittent routing failures with HTTPRoute ([issue 12610]).

### [`edge-24.5.3`](https://github.com/linkerd/linkerd2/releases/tag/edge-24.5.3) (May 15, 2024)

`edge-24.5.3` removes an internal limit on the number of concurrent gRPC streams to the control plane, leaving available memory as the only constraint.
_If you use the Linkerd CNI plugin on GKE, you will need to disable IPv6 or
use [`edge-24.5.5`] instead._

This release removes an internal limit on the number of concurrent gRPC
streams to the control plane, leaving available memory as the only constraint.

### [`edge-24.5.2`](https://github.com/linkerd/linkerd2/releases/tag/edge-24.5.2) (May 13, 2024)

`edge-24.5.2` adds support for IPv6 (set `disableIPv6` to `false` when
installing the control plane to use it). It also correctly sets the
_If you use the Linkerd CNI plugin on GKE, you will need to disable IPv6 or
use [`edge-24.5.5`] instead._

This release adds support for IPv6. It defaults to enabled: set `disableIPv6`
to `true` when installing to disable it. It also correctly sets the
`backend_not_found` status on HTTPRoutes with no backends. Finally, it adds
the Gateway API GRPCRoute resource (in the `gateway.networking.k8s.io` API
group) as part of continued work on support for GRPCRoutes, although this edge
Expand All @@ -111,15 +120,25 @@ set `enableHttpRoutes` to `false` when installing.

### [`edge-24.5.1`](https://github.com/linkerd/linkerd2/releases/tag/edge-24.5.1) (May 2, 2024)

_This release has one breaking change: the `patchs` metric introduced in [edge-24.3.4] is now correctly named `patches`._
_We recommend [`edge-24.5.5`] instead of this release due to a bug that
prevents Linkerd from functioning on GKE with the default configuration.
Additionally, this release has one breaking change: the `patchs` metric
introduced in [`edge-24.3.4`] is now correctly named `patches`._

`edge-24.5.1` adds configurable HTTP/2 server keepalives, fixes CLI issues and opaque-port issues when using native sidecars ([issue #12395]), restores Server v1beta1 to ease migrations after it was mistakenly removed in [edge-24.1.2], fixes an issue that could cause the endpoints gauge to report incorrect numbers of endpoints, and continues ongoing work on upcoming IPv6 support.
This release adds configurable HTTP/2 server keepalives, fixes CLI issues and
opaque-port issues when using native sidecars ([issue #12395]), restores
Server v1beta1 to ease migrations after it was mistakenly removed in
[`edge-24.1.2`], fixes an issue that could cause the endpoints gauge to report
incorrect numbers of endpoints, and continues ongoing work on upcoming IPv6
support.

Additionally, it avoids unnecessary cleanup of headless endpoint mirrors during garbage collection (thanks, [Marwan Ahmed]!) and cleans up some documentation in the code (thanks, [knowmost]!).
Additionally, it avoids unnecessary cleanup of headless endpoint mirrors
during garbage collection (thanks, [Marwan Ahmed]!) and cleans up some
documentation in the code (thanks, [knowmost]!).

[issue #12395]: https://github.com/linkerd/linkerd2/issues/12395
[edge-24.3.4]: https://github.com/linkerd/linkerd2/releases/tag/edge-24.3.4
[edge-24.1.2]: https://github.com/linkerd/linkerd2/releases/tag/edge-24.1.2
[`edge-24.3.4`]: https://github.com/linkerd/linkerd2/releases/tag/edge-24.3.4
[`edge-24.1.2`]: https://github.com/linkerd/linkerd2/releases/tag/edge-24.1.2
[Marwan Ahmed]: https://github.com/marwanad
[knowmost]: https://github.com/knowmost

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