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@klingerf klingerf released this 12 Feb 22:47
stable-2.2.0
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Learn about vigilant mode.

Announcing Linkerd 2.2 🎈

This stable release introduces automatic request retries and timeouts, and graduates auto-inject to be a fully-supported (non-experimental) feature. It adds several new CLI commands, including logs and endpoints, that provide diagnostic visibility into Linkerd's control plane. Finally, it introduces two exciting experimental features: a cryptographically-secured client identity header, and a CNI plugin that avoids the need for NET_ADMIN kernel capabilities at deploy time.

For more details, see the announcement blog post:
https://blog.linkerd.io/2019/02/12/announcing-linkerd-2-2/

To install this release, run: curl https://run.linkerd.io/install | sh

Upgrade notes: The default behavior for proxy auto injection and service profile ownership has changed as part of this release. Please see the upgrade instructions for more details.

Special thanks to: @alenkacz, @codeman9, @jonrichards, @radu-matei, @yeya24, and @zknill

Full release notes:

  • CLI
    • Improved service profile validation when running linkerd check in order to
      validate service profiles in all namespaces
    • Added the linkerd endpoints command to introspect Linkerd's service
      discovery state
    • Added the --tap flag to linkerd profile to generate service profiles
      using the route results seen during the tap
    • Added support for the linkerd.io/inject: disabled annotation on pod specs
      to disable injection for specific pods when running linkerd inject
    • Added support for basePath in OpenAPI 2.0 files when running linkerd profile --open-api
    • Increased linkerd check client timeout from 5 seconds to 30 seconds to fix
      issues for clusters with slow API servers
    • Updated linkerd routes to no longer return rows for ExternalName
      services in the namespace
    • Broadened the set of valid URLs when connecting to the Kubernetes API
    • Added the --proto flag to linkerd profile to output a service profile
      based on a Protobuf spec file
    • Fixed CLI connection failures to clusters that use self-signed certificates
    • Simplified linkerd install so that setting up proxy auto-injection
      (flag --proxy-auto-inject) no longer requires enabling TLS (flag --tls)
    • Added links for each linkerd check failure, pointing to a relevant section
      in our new FAQ page with resolution steps for each case
    • Added optional linkerd install-sp command to generate service profiles for
      the control plane, providing per-route metrics for control plane components
    • Removed --proxy-bind-timeout flag from linkerd install and
      linkerd inject, as the proxy no longer accepts this environment variable
    • Improved CLI appearance on Windows systems
    • Improved linkerd check output, fixed bug with --single-namespace
    • Fixed panic when linkerd routes is called in single-namespace mode
    • Added linkerd logs command to surface logs from any container in the
      Linkerd control plane
    • Added linkerd uninject command to remove the Linkerd proxy from a
      Kubernetes config
    • Improved linkerd inject to re-inject a resource that already has a Linkerd
      proxy
    • Improved linkerd routes to list all routes, including those without
      traffic
    • Improved readability in linkerd check and linkerd inject outputs
    • Adjusted the set of checks that are run before executing CLI commands, which
      allows the CLI to be invoked even when the control plane is not fully ready
    • Fixed reporting of injected resources when the linkerd inject command is
      run on List type resources with multiple items
    • Updated the linkerd dashboard command to use port-forwarding instead of
      proxying when connecting to the web UI and Grafana
    • Added validation for the ServiceProfile CRD
    • Updated the linkerd check command to disallow setting both the --pre and
      --proxy flags simultaneously
    • Added --routes flag to the linkerd top command, for grouping table rows
      by route instead of by path
    • Updated Prometheus configuration to automatically load *_rules.yml files
    • Removed TLS column from the linkerd routes command output
    • Updated linkerd install output to use non-default service accounts,
      emptyDir volume mounts, and non-root users
    • Removed cluster-wide resources from single-namespace installs
    • Fixed resource requests for proxy-injector container in --ha installs
  • Controller
    • Fixed issue with auto-injector not setting the proxy ID, which is required
      to successfully locate client service profiles
    • Added full stat and tap support for DaemonSets and StatefulSets in the CLI,
      Grafana, and web UI
    • Updated auto-injector to use the proxy log level configured at install time
    • Fixed issue with auto-injector including TLS settings in injected pods even
      when TLS was not enabled
    • Changed automatic proxy injection to be opt-in via the linkerd.io/inject
      annotation on the pod or namespace
    • Move service profile definitions to client and server namespaces, rather
      than the control plane namespace
    • Added linkerd.io/created-by annotation to the linkerd-cni DaemonSet
    • Added a 10 second keepalive default to resolve dropped connections in Azure
      environments
    • Improved node selection for installing the linkerd-cni DaemonSet
    • Corrected the expected controller identity when configuring pods with TLS
    • Modified klog to be verbose when controller log-level is set to debug
    • Added support for retries and timeouts, configured directly in the service
      profile for each route
    • Added an experimental CNI plugin to avoid requiring the NET_ADMIN capability
      when injecting proxies
    • Improved the API for ListPods
    • Fixed GetProfiles API call not returning immediately when no profile
      exists (resulting in proxies logging warnings)
    • Blocked controller initialization until caches have synced with kube API
    • Fixed proxy-api handling of named target ports in service configs
    • Added parameter to stats API to skip retrieving prometheus stats
  • Web UI
    • Updated navigation to link the Linkerd logo back to the Overview page
    • Fixed console warnings on the Top page
    • Grayed-out the tap icon for requests from sources that are not meshed
    • Improved resource detail pages to show all resource types
    • Fixed stats not appearing for routes that have service profiles installed
    • Added "meshed" and "no traffic" badges on the resource detail pages
    • Fixed linkerd dashboard to maintain proxy connection when browser open fails
    • Fixed JavaScript bundling to avoid serving old versions after upgrade
    • Reduced the size of the webpack JavaScript bundle by nearly 50%
    • Fixed an indexing error on the top results page
    • Restored unmeshed resources in the network graph on the resource detail page
    • Adjusted label for unknown routes in route tables, added tooltip
    • Updated Top Routes page to persist form settings in URL
    • Added button to create new service profiles on Top Routes page
    • Fixed CLI commands displayed when linkerd is running in non-default
      namespace
  • Proxy
    • Modified the way in which canonicalization warnings are logged to reduce the
      overall volume of error logs and make it clearer when failures occur
    • Added TCP keepalive configuration to fix environments where peers may
      silently drop connections
    • Updated the Get and GetProfiles APIs to accept a proxy_id parameter in
      order to return more tailored results
    • Removed TLS fallback-to-plaintext if handshake fails
    • Added the ability to override a proxy's normal outbound routing by adding an
      l5d-override-dst header
    • Added LINKERD2_PROXY_DNS_CANONICALIZE_TIMEOUT environment variable to
      customize the timeout for DNS queries to canonicalize a name
    • Added support for route timeouts in service profiles
    • Improved logging for gRPC errors and for malformed HTTP/2 request headers
    • Improved log readability by moving some noisy log messages to more verbose
      log levels
    • Fixed a deadlock in HTTP/2 stream reference counts
    • Updated the proxy-init container to exit with a non-zero exit code if
      initialization fails, making initialization errors much more visible
    • Fixed a memory leak due to leaked UDP sockets for failed DNS queries
    • Improved configuration of the PeakEwma load balancer
    • Improved handling of ports configured to skip protocol detection when the
      proxy is running with TLS enabled
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