Buoyant Enterprise for Linkerd RSS

A production-ready distribution of Linkerd brought to you by Buoyant, the creators of Linkerd.


May 20, 2024

The 2.15.3 stable point release includes a variety of bug fixes, usability improvements, and new diagnostic and configuration features. It also adjusts the default configuration of the HAZL load balancer to be more aggressive in shifting load to other zones.

Previous release: enterprise-2.15.2.

Who should upgrade?

  • Users who are using native sidecars should upgrade. This release contains several bugfixes related to native sidecars.
  • Users who are making heavy use of HTTPRoutes, or who are experiencing high memory usage in the policy controller accompanied by “Failed to patch HTTPRoute” error messages, should upgrade. This release fixes an issue with how the policy controller was interacting with the Kubnetes API for HTTPRoutes.
  • Users who are using multicluster should upgrade. This release fixes a panic in the service mirror controller as well as another minor issue.

How to upgrade

Please see the instructions in Upgrading BEL.

Note that in this release, we’ve moved the on-cluster storage for license keys from ConfigMaps to Secrets. Users with license keys in ConfigMaps will be automatically upgraded to a Secret. For more information on managing licenses, see Configuring license secret installation.

To upgrade with BEL’s lifecycle automation operator, you will need Buoyant Extension version v0.29.0 or later.

Full Changelog

CLI changes

  • Print license information to stderr instead of stdout
  • Install version edge-24.2.4 of viz and jaeger extensions, rather than pointing to non-existing BEL versions
  • Remove the need to include the --set license= flag on install commands
  • Add a diagnostics profile command (backported from linkerd2#12383)

Helm chart changes

  • Correct the minimum supported Kubernetes version in the BEL Helm charts to 1.22 (not 1.21)
  • Support arbitrary proxy parameters in Helm values (backported from linkerd2#12493)

Control plane changes

  • Move license storage from a ConfigMap to a Secret
  • Revert HAZL default load band parameters to the configuration used in BEL 2.15.1 and earlier, allowing HAZL to be more aggressive in shifting to other zones by default
  • Update HTTPRoutes CRD to include a port field in the route status parent ref (backported from linkerd2#12454)
  • Fix multiple issues with native sidecars (backported from linkerd2#12453)
  • Update policy controller to rename “patchs” metric to “patches” (backported from linkerd2#12533)

Extension changes

  • Fix panic in mulitcluster service mirror controller (backported from linkerd2#12406)
  • Avoid unnecessary headless endpoint mirrors cleanups during GC (backported from linkerd2#12500)

Proxy changes

CVE remediations and updates


May 15, 2024
  • First release of the autoregistration harness


April 5, 2024

The 2.15.2 stable point release includes bug fixes, CVE remediations, and some minor feature updates. It merges HAZL into the main proxy build (previous releases required a separate build), improves certain metrics, and fixes a memory leak in the policy controller.

Who should upgrade?

  • Users who want to use the high-availability zonal load balancer (HAZL) should upgrade to this release, as it no longer requires a separate proxy image.
  • Users who are experiencing a memory leak in the policy controller component of the control plane should upgrade.
  • Other users should upgrade at their convenience.

How to upgrade

Please follow the instructions in Upgrading Buoyant Enterprise for Linkerd.

To upgrade with BEL’s lifecycle automation operator, you will need Buoyant Extension version v0.27.4 or later.

Full Changelog

CLI changes

  • Introduce a linkerd license CLI command, to output client and server license information.
  • Update linkerd check to validate Linkerd version strings that include build and patch info, e.g. enterprise-2.15.1-1-fips

Helm changes

  • Introduce a licenseSecret Helm value to allow storing the Buoyant license in a Kubernetes secret.

Control plane changes

  • Backport fix(injector): Stop emitting warnings about skipped resources (linkerd2#12254)
  • Backport fix(destination): Removes should not change local traffic policy (linkerd2#12325)
  • Backport fix(identity): Log token validation errors at WARN (linkerd2#12187)
  • Backport fix(cli): Remove kube-system injection check (linkerd2#12263)
  • Backport fix(policy): Don’t patch httproute status if it hasn’t changed (linkerd2#12215)

Proxy changes

CVE remediations and updates


February 23, 2024

This is a minor update that is primarily intended to assist Enterprise Plan users who are enabling HAZL.

Who should upgrade?

Users on the Enterprise Plan who want to enable HAZL should upgrade.

How to upgrade

To upgrade with BEL’s lifecycle automation operator, you will need Buoyant Extension version v0.27.2 or later.


  • Updated Helm charts to synchronize with the newer AdditionalEnv and AdditionalArgs values, allowing users to enable features such as HAZL (when available) with the newer terminology.
  • Updated Go helm dependency to remediate CVE-2024-26147


February 21, 2024

Linkerd 2.15 is a new major release that adds support for workloads outside of Kubernetes. This new “mesh expansion” feature allows Linkerd users to bring applications running on VMs, physical machines, and other non-Kubernetes locations into the mesh.

Linkerd 2.15 also introduces support for SPIFFE, a standard for workload identity which allows Linkerd to provide cryptographic identity and authentication to off-cluster workloads.

Finally, Linkerd 2.15 adds support for native sidecar containers, a new Kubernetes feature that eases some of the long-standing annoyances of the sidecar model in Kubernetes, especially with Job workloads.

See the BEL 2.15 announcement blog post for more details.

Who should upgrade?

This is a feature release that unlocks new capabilities. Users with non-Kubernetes workloads that they want to add to the mesh, or users who want to use Kubernetes 1.29, should upgrade.

Users with Job workloads, init container race conditions, or other situations that would benefit from native sidecar support, can upgrade to simplify their usage of Linkerd. Native sidecar support can obviate the need for linkerd-await in Job workloads and can allow Linkerd to work well with other init containers.

How to upgrade

To upgrade with BEL’s lifecycle automation operator, you will need Buoyant Extension version v0.27.1 or later.

Kubernetes version support

This release changes the minimum supported Kubernetes version to 1.22, and the update the maximum supported Kubernetes version to 1.29.


Native sidecar containers

  • Introduced support for the native sidecar containers entering beta support in Kubernetes 1.29, improving the startup and shutdown ordering for the proxy relative to other containers, and fixing the long-standing shutdown issue with injected Jobs. Furthermore, traffic from other initContainers can now be proxied by Linkerd (#11465; fixes #11461).

Mesh expansion

  • Introduced a new ExternalWorkload CRD to support enrolling VMs into a meshed Kubernetes cluster
  • Introduced a new controller in the destination service that will manage EndpointSlice resources for Service objects that select external workloads

Control Plane

  • Fixed policy controller error when deleting a Gateway API HTTPRoute resource (#11471)
  • Fixed an issue where the Destination controller could stop processing service profile updates, if a proxy subscribed to those updates stops reading them (#11546)
  • Fixed an issue in the destination controller where the metadata API would not initialize a Job informer. The destination controller uses the metadata API to retrieve Job metadata, and relies mostly on informers. Without an initialized informer, an error message would be logged, and the controller relied on direct API calls (#11541; fixes #11531)
  • Fixed an issue in the destination controller that could cause outbound connections to hang indefinitely. (#11540 and #11556)
  • In the Destination controller, added informer lag histogram metrics to track whenever the Kubernetes objects watched by the controller are falling behind the state in the kube-apiserver (#11534)
  • Changed how the policy controller updates HTTPRoute status so that it doesn’t affect statuses from other non-linkerd controllers (#11705; fixes #11659)
  • Added a control plane metric to count errors talking to the Kubernetes API (#11774)
  • Fixed an issue causing spurious destination controller error messages for profile lookups on unmeshed pods with port in default opaque list (#11550)
  • Changed how Server updates are handled in the destination service. The change will ensure that during a cluster resync, consumers won’t be overloaded by redundant updates (#11907)
  • Updated the Destination controller to return INVALID_ARGUMENT status codes properly when a ServiceProfile is requested for a service that does not exist. (#11980)
  • Changed how updates to a Server selector are handled in the destination service. When a Server that marks a port as opaque no longer selects a resource, the resource’s opaqueness will reverted to default settings (#12031; fixes #11995)
  • Removed uses of OpenSSL v1.1.1 in favor of OpenSSL v3
  • Fixed a bug in the GetProfile API where the destination controller could become stuck and stop serving discovery responses.
  • Improved proxy logging so that all service discovery updates are logged at INFO.
  • Added externalWorkloadSelector to the Server resource to fascilitate policy for ExternalWorkloads` #11899
  • Added queue metrics to endpoints controller workqueue #11958
  • Implemented handling of EndpointSlices that point ExternalWorkload resources #11939
  • Enabled support for SPIFFE IDs in MeshTLSAuthentication #11882
  • Fixed a race condition in the destination service that could cause panics under very specific conditions #12022; fixes #12010


  • Improved the load balancer so that service discovery updates are processed eagerly, ensuring that low-traffic services do not retain connections to defunct endpoints.
  • The proxy’s control plane clients now limit time they maintain discovery streams to ensure that load is more evenly distributed across control plane instances.
  • The proxy’s control plane clients now limit idle discovery streams to help prevent staleness.
  • Added a variety of load-balancer specific metrics to measure the queue’s state
  • Updated the hyper and h2 dependencies to address bugs
  • Fixed an issue where the default queue sizes were too small and could cause issues in high-traffic services
  • Fixed an issue where the ‘classification’ label was incorrectly applied on inbound gRPC traffic

Multi-cluster extension

  • Fixed a "duplicate metrics" warning in the multicluster service-mirror component #11875; fixes #11839
  • Fixed broken affinity rules for the multicluster service-mirror when running in HA mode
  • Added a new check to linkerd check that ensures all extension namespaces are configured properly
  • Fixed a bug where the linkerd multicluster link command’s --gateway-addresses flag was not respected when a remote gateway exists
  • Fixed an issue where an empty remoteDiscoverySelector field in a multicluster link would cause all services to be mirrored

Jaeger extension

  • Extended linkerd-jaeger’s imagePullSecrets Helm value to also apply to the namespace-metadata ServiceAccount #11504

Viz extension

  • Improved linkerd viz check to attempt to validate that the Prometheus scrape interval will work well with the CLI and Web query parameters (#11376)

Service Profiles

  • Fixed an issue in the ServiceProfile CRD schema. The schema incorrectly required that a not response match should be an array, which the service profile validator rejected since it expected an object. The schema has been updated to properly indicate that not values should be an object (#11510; fixes #11483)
  • Fixed an issue where trailing slashes wouldn’t be stripped when generating ServiceProfile resources through linkerd profile --open-api (#11519)


  • Improved CLI error handling to print differentiated error information when versioncheck.linkerd.io cannot be resolved (#11377; fixes #11349)
  • Introduced a new multicluster check --timeout flag to limit the time allowed for Kubernetes API calls (#11420; fixes #11266)
  • Changed linkerd install error output to add a newline when a Kubernetes client cannot be successfully initialised (#11917)

Manifests config / Helm

  • Introduced Helm configuration values for liveness and readiness probe timeouts and delays (#11458; fixes #11453)
  • Added probes to the debug container to appease environments requiring probes for all containers (#11308; fixes #11307)
  • Added a prometheusUrl field for the heartbeat job in the control plane Helm chart (#11343; fixes #11342)
  • Added a createNamespaceMetadataJob Helm value to control whether the namespace-metadata job is run during install (#11782)
  • Added a podAnnotations Helm value to allow adding additional annotations to the Linkerd-Viz Prometheus Deployment (#11374; fixes #11365)
  • Added namespaceSelector fields for the tap-injector and jaeger-injector webhooks. The webhooks are now configured to skip kube-system by default (#11649; fixes #11647)
  • Added a validating webhook config for httproutes.gateway.networking.k8s.io resources (#11150; fixes #11116)
  • Added support for config merge and Deployment environment to opentelemetry-collector in the jaeger extension (#11283)
  • Introduced support for arbitrary labels in the podMonitors field in the control plane Helm chart (#11222; fixes #11175)
  • Introduced PodDisruptionBudgets in the linkerd-viz Helm chart for tap and tap-injector (#11628; fixes #11248)
  • Allowed the MutatingWebhookConfig timeout value to be configured (#12028; fixes #12011)
  • Added nodeAffinity to deployment templates in the linkerd-viz and linkerd-jaeger Helm charts (#11464; fixes #10680)


January 31, 2024
  • Added Argo Rollouts support to linkerd policy generate CLI command
  • Modified linkerd policy generate CLI command to only generate policy for enterprise and preview proxies


January 14, 2024
  • Introduce a new linkerd fips audit CLI command, to audit FIPS compliance on Linkerd-enabled clusters


January 13, 2024
  • Initial release of Buoyant Enterprise for Linkerd preview channel
  • Introduce a new linkerd fips audit CLI command, to audit FIPS compliance on Linkerd-enabled clusters
  • Introduce Buoyant license requirement, please obtain a license from https://enterprise.buoyant.io


January 3, 2024
  • Updated Go protojson dependency to remediate CWE-121
  • Fixed an issue with ARM-based proxy containers failing to start


December 7, 2023
  • Fixed an issue where linkerd inject would unnecessarily set a config.linkerd.io/init-image-version annotation


December 7, 2023
  • Initial release of 2.14.6
  • Fixed an issue where linkerd inject would unnecessarily set a config.linkerd.io/init-image-version annotation


November 17, 2023
  • Updated proxy-init image to remediate CVE-2023-5678
  • The FIPS build now includes a FIPS policy-controller. All core control plane components are now FIPS compliant.


November 10, 2023
  • Updated proxy-init image to remediate CVE-2023-5363
  • The FIPS build now includes a FIPS policy-controller. All core control plane components are now FIPS compliant.