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edge-21.12.1
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edge-21.12.1

This edge release enables by default EndpointSlices in the destination
controller, which unblocks any functionality that is specific to
EndpointSlices such as topology-aware hints. It also contains a couple of
internal cleanups and upgrades, by our external contributors!

  • Added new check to linkerd check verifying the nodes aren't running the old
    Docker container runtime and attempting to run proxy-init as root at the same
    time, which doesn't work (thanks @alex-berger!)
  • Enabled EndpointSlices in the destination controller by default
  • Removed extraneous empty lines and fixed the formatting of warnings in the
    output of linkerd check -o short
  • Upgraded to go 1.17 (thanks @Juneezee!)
  • Removed old protobuf definitions from the codebase (thanks @krzysztofdrys!)
edge-21.11.4
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edge-21.11.4

This edge release introduces a change in the destination service to honor
opaque ports set in the proxyProtocol field of Server resources. This
change makes it possible to set opaque ports directly in Server resources
without needing the opaque ports annotation on pods. The release also features
a number of fixes and improvements, a big thank you to our external
contributors for their continued support and involvement.

  • Added support in the destination service for honoring opaque ports marked in
    Server resources; ports can now be marked as opaque directly in Server
    resources through the proxyProtocol field.
  • Added support to override default behavior and run proxyInit as root
    (thanks @alex-berger!)
  • Added multicluster Link CRD to code generation script; consumers of the
    multicluster API can now use a typed API to interact with multicluster links
    (thanks @zaharidichev!)
  • Added a multicluster integration test for exported headless services (thanks
    @importhuman!)
  • Deprecated v1alpha1 version of the policy APIs
  • Removed newline from linkerd check header text (thanks @mikutas!)
  • Replaced deprecated beta.kubernetes.io/os label with kubernetes.io/os
edge-21.11.3
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edge-21.11.3

This edge releases fixes a compatibility issue that prevented the policy
controller from starting in some Kubernetes distributions. This release also
includes a new High Availability mode for the gateway component in multicluster
extension. Various dependencies across the CNI plugin, Policy Controller and
dashboard have also been upgraded. In the proxy, error logging when the proxy
fails to accept a connection due to a system error has been improved.

  • Updated policy controller to use openssl instead of rustls to fix
    compatibility issues with some Kubernetes distributions
  • Added HA mode to multicluster gateway that adds a PodDisruptionBudget,
    additional replicas and anti-affinity to the deployment (thanks @Crevil)
  • Improved TCP server error messages in the proxy
  • Fixed broken Grafana links in the dashboard
  • Upgraded CNI pkg to v0.8.1 in linkerd-cni to support latest CNI
    versions
  • Updated various dependencies in the dashboard, policy controller
    (thanks @dependabot)
edge-21.11.2
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edge-21.11.2

This edge release introduces a new Services page in the web dashboard that shows
live calls and route metrics for meshed services. Additionally, the proxy-init
container is no longer enforced to run as root. Lastly, the proxy can now retry
requests with a content-length header—permitting requests emitted by grpc-go
to be retried.

  • Removed hardcoding that enforced the proxy-init container to run as root
    (thanks @chrischdi!)
  • Added support for retrying requests without a content-length header
  • Changed service discovery logs from TRACE to DEBUG
  • Fixed issue with policy controller where it assumed linkerd was the name of
    the control plane namespace, leading to issues with installations that use a
    non-default namespace name
  • Added support for ephemeral storage requests and limits configured either
    through the CLI or annotations (thanks @michaellzc!)
  • Deprecated support for topology keys and added support for topology aware
    hints
  • Added logFormat and logLevel configuration values for the proxy-init
    container (thanks @gusfcarvalho!)
  • Added services to the web dashboard (thanks @krzysztofdrys!)
  • Updated example commands in the web dashboard to use the viz subcommand when
    necessary (thanks @mikutas!)
  • Removed references to linkerd-sp-validator service account in the
    linkerd-psp role binding (thanks @multimac!)
edge-21.11.1
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edge-21.11.1

In this edge, we're very excited to introduce Service Account Token Volume
Projections, used to set up the pods' identities. These tokens are bounded
specifically for this use case and are rotated daily, replacing the usage of the
default tokens injected by Kubernetes which are overly permissive.

Note that this edge release updates the minimum supported kubernetes version to 1.20.

  • Updated the minimum supported kubernetes version to 1.20
  • Use Service Account Token Volume Projections to set up the pods' identities;
    now injection also works on pods with automountServiceAccountToken set to
    false
  • Updated proxy-init's Alpine base image to fix some CVEs (not affecting
    Linkerd)
  • Updated the Prometheus image in linkerd-viz to 2.30.3
  • Changed the proxy and policy controller to use jemalloc on x86_64 gnu/linux to
    reduce memory usage
  • Fixed output for linkerd check -o json
  • Added ability to configure ephemeral-storage resources for each component
    (thanks @michaellzc!)
stable-2.11.1
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stable-2.11.1

BEFORE YOU DOWNLOAD THIS RELEASE: Please take 60 seconds to tell the CNCF that you are using Linkerd. This is hugely important for the project, will only take a minute, and we need your voice! https://www.surveymonkey.com/r/LZJ9DD7

This release relaxes the policy on the identity controller, allowing it to work
in more environments. It updates the CLI and Helm charts to indicate that the
minimum supported Kubernetes version is 1.17.0. It also fixes a number of bugs
in the CLI, multicluster extension, and proxy.

  • Fixed incorrect opaque ports warning in linkerd check --proxy with un-named
    ports
  • Updated linkerd check to avoid multiline errors with retryable checks
  • Fixed multicluster gateway name for ServerAuthorization
  • Removed unused crtExpiry template parameter from helm charts
  • Updated minimum kubernetes version to 1.17.0
  • Moved service mirror policy into multicluster base chart
  • Added an -o short command-line flag for extension check commands
  • Skipped Prometheus scrapes on policy's admin server so that it no longer
    incorrectly appears as "DOWN" in the Prometheus UI
  • Updated the identity controller to use the 'all-unauthenticated' policy so
    that it can accept health checks from the node IPs
  • Fixed a bug where authz CLI commands would fail when policy resources had an
    empty selector
  • Fixed an infinite loop in the proxy that could cause it to be killed
  • Fixed a bug where extension checks were rendered in the wrong format
  • Changed the policy-controller to use jemalloc on x86_64 gnu/linux to reduce
    memory usage
edge-21.10.3
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edge-21.10.3

This edge release fixes a bug in the proxy that could cause it to be killed in
certain situations. It also uses a more relaxed policy for the identity
controller that allows it to work in environments where health checks come from
outside of the pod network.

  • Skipped Prometheus scrapes on policy's admin server so that it no longer
    incorrectly appears as "DOWN" in the Prometheus UI
  • Updated the identity controller to use the 'all-unauthenticated' policy so
    that it can accept health checks from the node IPs
  • Fixed an infinite loop in the proxy that could cause it to be killed
  • Added tests for the multicluster install command (thanks @Crevil!)
  • Fixed a bug where authz CLI commands would fail when policy resources had
    an empty selector
edge-21.10.2
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edge-21.10.2

This edge release fixes linkerd check and the helm charts to explicitly
indicate that the minimum Kubernetes version is 1.17.0. Prior to this change,
there was no validation or enforcement from linkerd check or helm to meet this
minimum requirement.

This edge also improves check functionality for extensions by adding the
-oshort flag, and prevents duplicate policy resources from being created for
linked multicluster services.

  • Moved service mirror policy into multicluster base chart
  • Added -oshort flag for extension check commands
  • Updated minimum kubernetes version to 1.17.0
  • Removed unused crtExpiry template parameter from helm charts
  • Fixed multicluster gateway name for ServerAuthorization
  • Added priorityClassName to the helm charts to configure control plane
    components
edge-21.10.1
5d5e7a0
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edge-21.10.1

This release includes some fixes in the linkerd check, along with a
bunch of dependency updates across the dashboard, Go components, and
others. On the proxy side, Support for TLSv1.2 has been dropped
(Only TLSv1.3 cipher suite will be used), h2 crate has been updated
to support HTTP/2 messages with larger header values.

  • Updated linkerd check to avoid multiline errors with retryable checks
  • Fixed incorrect opaque ports warning in linkerd check --proxy with
    un-named ports
  • Bumped proxy-init to 1.4.1 which adds support for --log-level
    and --log-format flags (thanks @gusfcarvalho)
  • Removed the use of TLSv1.2 in the proxy
  • Updated the h2 crate in the proxy to support HTTP/2 messages with
    larger header values.
  • Updated various dependencies across the dashboard, policy-controller, etc
    (thanks @dependabot!)
stable-2.11.0
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stable-2.11.0

This release introduces access control policies. Default policies may be
configured at the cluster- and workspace-levels; and fine grained policies may
be instrumented via the new policy.linkerd.io/v1beta1 CRDs: Server and
ServerAuthorization. These resources may be created to define how individual
ports accept connections; and the Server resource will be a building block for
future features that configure inbound proxy behavior.

Furthermore, ServiceProfile retry configurations can now instrument retries
for requests with bodies. This unlocks retry behavior for gRPC services.

Upgrade notes: Please see the upgrade instructions.

  • Proxy

    • Reduced CPU & Memory usage by up to 30% in some load tests
    • Updated retries to support requests with bodies up to 64KB. ServiceProfiles
      may now configure retries for gRPC services
    • The proxy's container image is now based on gcr.io/distroless/cc to
      contain a minimal OS footprint that should not trigger unnecessary alerts in
      security scanners
    • Added the inbound_http_errors_total and outbound_http_errors_total
      metrics to reflect errors that caused the proxy to respond with errors
    • Added an l5d-proxy-error header that is included on responses on trusted
      connections for debugging purposes
    • Added a l5d-client-id header on mutually-authenticated inbound requests so
      that applications can discover the client's identity
    • Added metrics to reflect TCP and HTTP authorization decisions
    • Added srv_name and saz_name labels to inbound HTTP metrics
    • Fixed an issue that could cause the proxy to continually reconnect to
      defunct service endpoints
    • Dropped support for non-HTTP outbound services when linkerd.io/inject: ingress is used
    • Instrumented fuzz testing to help guard against unexpected panics
  • Control Plane

    • Added a new policy-controller container to the linkerd-destination
      pod--the first control plane component implemented in Rust
    • Added a new admission controller to validate that multiple Server
      resources do not reference the same port
    • Added a linkerd-identity-trust-roots ConfigMap which configures the trust
      root bundle for all pods in the core control plane namespace
    • Eliminated the linkerd-controller deployment so that Linkerd's core
      control plane now consists of only 3 deployments
    • Updated the proxy injector to configure the proxy-init container with
      NET_RAW and NET_ADMIN capabilities so that the container does not fail
      when the pod drops these capabilities
  • CLI

    • Enhanced linkerd completion to expand Kubernetes resources from the current
      kubectl context
    • Added an authz subcommand to display the authorization policies that
      impact a workload
    • Added a short output mode for linkerd check that only prints failed
      checks
    • Added support for ReplicaSets to linkerd stat so that pods created by
      Argo Rollout resources can be inspected
  • Helm: please see the upgrade instructions.

  • Extensions:

    • Introduced a new (optional) SMI extension responsible for reading
      specs.smi-spec.io resources and converting them to Linkerd resources

    • In stable-2.12, this extension will be required to use TrafficSplit
      resources with Linkerd

    • Added an extensions page to the Linkerd Web UI

    • Viz

      • Added Server and ServerAuthorization resources for all ports
      • Added JSON log formatting
    • Jaeger

      • Added OpenTelemetry collector instead of OpenCensus
    • Multicluster

      • Added experimental support for StatefulSet workloads

This release includes changes from a massive list of contributors. A special
thank-you to everyone who helped make this release possible:

Gustavo Fernandes de Carvalho @gusfcarvalho
Oleg Vorobev @olegy2008
Bart Peeters @bartpeeters
Stepan Rabotkin @EpicStep
LiuDui @xichengliudui
Andrew Hemming @drewhemm
Ujjwal Goyal @importhuman
Knut Götz @knutgoetz
Sanni Michael @sannimichaelse
Brandon Sorgdrager @bsord
Gerald Pape @ubergesundheit
Alexey Kostin @rumanzo
rdileep13 @rdileep13
Takumi Sue @mikutas
Akshit Grover @akshitgrover
Sanskar Jaiswal @aryan9600
Aleksandr Tarasov @aatarasoff
Taylor @SkinN
Miguel Ángel Pastor Olivar @migue
wangchenglong01 @wangchenglong01
Josh Soref @jsoref
Carol Chen @kipply
Peter Smit @psmit
Tarvi Pillessaar @tarvip
James Roper @jroper
Dominik Münch @muenchdo
Szymon Gibała @Szymongib
Mitch Hulscher @mhulscher