Chapter 6. Red Hat OpenShift Service Mesh Release Notes

6.1. Red Hat OpenShift Service Mesh overview

Red Hat OpenShift Service Mesh is a platform that provides behavioral insight and operational control over the service mesh, providing a uniform way to connect, secure, and monitor microservice applications.

The term service mesh describes the network of microservices that make up applications in a distributed microservice architecture and the interactions between those microservices. As a service mesh grows in size and complexity, it can become harder to understand and manage.

Based on the open source Istio project, Red Hat OpenShift Service Mesh adds a transparent layer on existing distributed applications without requiring any changes to the service code. You add Red Hat OpenShift Service Mesh support to services by deploying a special sidecar proxy throughout your environment that intercepts all network communication between microservices. You configure and manage the service mesh using the control plane features.

Red Hat OpenShift Service Mesh provides an easy way to create a network of deployed services that provides discovery, load balancing, service-to-service authentication, failure recovery, metrics, and monitoring. A service mesh also provides more complex operational functionality, including A/B testing, canary releases, rate limiting, access control, and end-to-end authentication.

6.2. Getting support

If you experience difficulty with a procedure described in this documentation, visit the Red Hat Customer Portal at http://access.redhat.com. Through the customer portal, you can:

  • Search or browse through the Red Hat Knowledgebase of technical support articles about Red Hat products
  • Submit a support case to Red Hat Global Support Services (GSS)
  • Access other product documentation

If you have a suggestion for improving this guide or have found an error, please submit a Bugzilla report at http://bugzilla.redhat.com against Product for the Documentation component. Please provide specific details, such as the section number, guide name, and Service Mesh version so we can easily locate the content.

6.3. Red Hat OpenShift Service Mesh supported configurations

The following are the only supported configurations for the Red Hat OpenShift Service Mesh 1.0:

  • Red Hat OpenShift Container Platform version 4.1.
Note

OpenShift Online and OpenShift Dedicated are not supported for Red Hat OpenShift Service Mesh 1.0.

  • The deployment must be contained to a single OpenShift Container Platform cluster that is not federated.
  • This release of Red Hat OpenShift Service Mesh is only available on OpenShift Container Platform x86_64.
  • Red Hat OpenShift Service Mesh is only suited for OpenShift Container Platform Software Defined Networking (SDN) configured as a flat network with no external providers.
  • This release only supports configurations where all Service Mesh components are contained in the OpenShift cluster in which it operates. It does not support management of microservices that reside outside of the cluster, or in a multi-cluster scenario.
  • This release only supports configurations that do not integrate external services such as virtual machines.

6.3.1. Supported configurations for Kiali on Red Hat OpenShift Service Mesh

  • The Kiali observability console is only supported on the two most recent releases of the Chrome, Edge, Firefox, or Safari browsers.

6.3.2. Supported Mixer adapters

  • This release only supports the following Mixer adapter:

    • 3scale Istio Adapter

6.3.3. New features Red Hat OpenShift Service Mesh 1.0

This release of Red Hat OpenShift Service Mesh adds support for Istio 1.1.11, Jaeger 1.13.1, Kiali 1.0.5, and the 3scale Istio Adapter 1.0.

Other notable changes in this release include the following:

  • The Kubernetes Container Network Interface (CNI) plug-in is always on.
  • The control plane is configured for multitenancy by default. Single tenant, cluster-wide control plane configurations are deprecated.
  • The Elasticsearch, Jaeger, Kiali, and Service Mesh Operators are installed from OperatorHub.
  • You can create and specify control plane templates.
  • Automatic route creation was removed from this release.

6.3.4. New features Technology Preview 12

This release of Red Hat OpenShift Service Mesh adds support for Istio 1.1.8, Jaeger 1.13.1, Kiali 1.0.0, and the 3scale Istio Adapter 0.7.1.

Other notable changes in this release include the following:

  • Integrates the Kiali and Jaeger operators into the installation.
  • Adds support for Kubernetes Container Network Interface (CNI) plug-in.
  • Adds support for Operator Lifecycle Management (OLM).
  • Updates the Istio OpenShift Router for multitenancy.
  • Defaults to configuring the control planes for multitenancy. You can still configure a single tenant control plane in Red Hat OpenShift Service Mesh 0.12.TechPreview.
Note

To simplify installation and support, this release only supports a multi-tenant control plane for one or more tenants.

6.3.5. New features Technology Preview 11

The release of Red Hat OpenShift Service Mesh adds support for multi-tenant installations, Red Hat Enterprise Linux (RHEL) Universal Base Images (UBI8), OpenSSL 1.1.1, Kiali 0.20.x, the 3scale Istio Adapter 0.6.0, and Istio 1.1.5.

6.3.6. New features Technology Preview 10

The release of Red Hat OpenShift Service Mesh adds support for Kiali 0.16.x, the 3scale Istio Adapter 0.5.0, and Istio 1.1.

6.3.7. New features Technology Preview 9

The release of Red Hat OpenShift Service Mesh adds support for Kiali 0.15.x, Jaeger 1.11, the 3scale Istio Adapter 0.4.1, and Istio 1.1.0-rc.2.

6.3.8. New features Technology Preview 8

The release of Red Hat OpenShift Service Mesh adds support for Kiali 0.14.x and the 3scale Istio Adapter 0.3.

6.3.9. New features Technology Preview 7

The release of Red Hat OpenShift Service Mesh adds the 3scale Istio Adapter and support for Kiali 0.13.x, Jaeger 1.9.0, and Istio 1.1.

6.3.10. New features Technology Preview 6

The release of Red Hat OpenShift Service Mesh adds support for Kiali 0.11.x and and Istio 1.0.5.

6.3.11. New features Technology Preview 5

The release of Red Hat OpenShift Service Mesh adds support for Kiali 0.10.x, Jaeger 1.8.1, and Istio 1.0.4.

6.3.12. New features Technology Preview 4

The release of Red Hat OpenShift Service Mesh adds support for Kiali 0.9.x and Istio 1.0.3.

6.3.13. New features Technology Preview 3

The release of Red Hat OpenShift Service Mesh adds support for OpenShift 3.11, support for Kiali 0.8.x, and an updated base Ansible installer (3.11.16-3).

6.3.14. New features Technology Preview 2

The release adds the Kiali observability console to Red Hat OpenShift Service Mesh. Kiali provides a number of graphs that you can use to view the topography and health of the microservices that make up your service mesh. You can view predefined dashboards that provide detailed request and response metrics (volume, duration, size, TCP traffic) per inbound and outbound traffic. You can also browse your service mesh by application, workloads, and services to view the health of each element.

6.3.15. New features Technology Preview 1

Red Hat OpenShift Service Mesh provides a number of key capabilities uniformly across a network of services:

  • Traffic Management - Control the flow of traffic and API calls between services, make calls more reliable, and make the network more robust in the face of adverse conditions.
  • Service Identity and Security - Provide services in the mesh with a verifiable identity and provide the ability to protect service traffic as it flows over networks of varying degrees of trustworthiness.
  • Policy Enforcement - Apply organizational policy to the interaction between services, ensure access policies are enforced and resources are fairly distributed among consumers. Policy changes are made by configuring the mesh, not by changing application code.
  • Telemetry - Gain understanding of the dependencies between services and the nature and flow of traffic between them, providing the ability to quickly identify issues.

6.4. Known issues

These limitations exist in Red Hat OpenShift Service Mesh at this time:

  • Red Hat OpenShift Service Mesh does not support IPv6, as it it not supported by the upstream Istio project, nor fully supported by OpenShift.
  • Graph layout - The layout for the Kiali graph can render differently, depending on your application architecture and the data to display (number of graph nodes and their interactions). Because it is difficult if not impossible to create a single layout that renders nicely for every situation, Kiali offers a choice of several different layouts. To choose a different layout, you can choose a different Layout Schema from the Graph Settings menu.
Note

While Kafka publisher is included in the release as part of Jaeger, it is not supported.

6.4.1. Red Hat OpenShift Service Mesh known issues

These are the known issues in Red Hat OpenShift Service Mesh at this time:

  • Istio-14743 Due to limitations in the version of Istio that this release of Red Hat OpenShift Service Mesh is based on, there are several applications that are currently incompatible with Service Mesh. See the linked community issue for details.
  • MAISTRA-858 The following Envoy log messages describing deprecated options and configurations associated with Istio 1.1.x are expected:

    • [2019-06-03 07:03:28.943][19][warning][misc] [external/envoy/source/common/protobuf/utility.cc:129] Using deprecated option 'envoy.api.v2.listener.Filter.config'. This configuration will be removed from Envoy soon.
    • [2019-08-12 22:12:59.001][13][warning][misc] [external/envoy/source/common/protobuf/utility.cc:174] Using deprecated option 'envoy.api.v2.Listener.use_original_dst' from file lds.proto. This configuration will be removed from Envoy soon.
  • MAISTRA-681 and KIALI-2686 When the control plane has many namespaces, it can lead to performance issues.
  • MAISTRA-622 In Maistra 0.12.0/TP12, permissive mode does not work. The user has the option to use Plain text mode or Mutual TLS mode, but not permissive.
  • MAISTRA-465 The Maistra operator fails to create a service for operator metrics.
  • MAISTRA-453 If you create a new project and deploy pods immediately, sidecar injection does not occur. The operator fails to add the maistra.io/member-of before the pods are created, therefore the pods must be deleted and recreated for sidecar injection to occur.
  • MAISTRA-348 To access a TCP service by using the ingress gateway on a port other than 80 or 443, use the service hostname provided by the AWS load balancer rather than the OpenShift router.

    The istio-ingressgateway route hostname (for example, istio-ingressgateway-istio-system.apps.[cluster name].openshift.com) works with port 80 or port 443 traffic. However, that route hostname does not support other port traffic.

    To access service(s) running on the ingress gateway TCP port(s), you can retrieve the istio-ingressgateway external hostname (for example, [uuid].[aws region].elb.amazonaws.com) and then check traffic by using that external hostname value.

    To retrieve the external IP hostname value, issue this command:

    $ oc -n istio-system get service istio-ingressgateway -o jsonpath='{.status.loadBalancer.ingress[0].hostname}'
  • MAISTRA-193 Unexpected console info messages are visible when health checking is enabled for citadel.
  • MAISTRA-158 Applying multiple gateways referencing the same hostname will cause all gateways to stop functioning.
  • MAISTRA-806 Evicted Istio Operator Pod causes mesh and CNI not to deploy.

    If the istio-operator pod is evicted while deploying the control pane, delete the evicted istio-operator pod.

6.4.2. Kiali known issues

  • KIALI-3262 In the Kiali console, when you click on Distributed Tracing in the navigation or on a Traces tab, you are asked to accept the certificate, and then asked to provide your OpenShift login credentials. This happens due to an issue with how the framework displays the Trace pages in the Console. The Workaround is to open the URL for the Jaeger console in another browser window and log in. Then you can view the embedded tracing pages in the Kiali console.
  • KIALI-3239 If a Kiali Operator pod has failed with a status of “Evicted” it blocks the Kiali operator from deploying. The workaround is to delete the Evicted pod and redeploy the Kiali operator.
  • KIALI-3118 After changes to the ServiceMeshMemberRoll, for example adding or removing projects, the Kiali pod restarts and then displays errors on the Graph page while the Kiali pod is restarting.
  • KIALI-3070 This bug only affects custom dashboards, not the default dashboards. When you select labels in metrics settings and refresh the page, your selections are retained in the menu but your selections are not displayed on the charts.
  • KIALI-2206 When you are accessing the Kiali console for the first time, and there is no cached browser data for Kiali, the “View in Grafana” link on the Metrics tab of the Kiali Service Details page redirects to the wrong location. The only way you would encounter this issue is if you are accessing Kiali for the first time.
  • KIALI-507 Kiali does not support Internet Explorer 11. This is because the underlying frameworks do not support Internet Explorer. To access the Kiali console, use one of the two most recent versions of the Chrome, Edge, Firefox or Safari browser.

6.5. Fixed issues

The following issues been resolved in the current release:

6.5.1. Red Hat OpenShift Service Mesh fixed issues

  • MAISTRA-684 The default Jaeger version in the istio-operator is 1.12.0, which does not match Jaeger version 1.13.1 that shipped in Red Hat OpenShift Service Mesh 0.12.TechPreview.
  • MAISTRA-572 Jaeger cannot be used with Kiali. In this release Jaeger is configured to use the OAuth proxy, but is also only configured to work through a browser and does not allow service access. Kiali cannot properly communicate with the Jaeger endpoint and it considers Jaeger to be disabled. See also TRACING-591.
  • MAISTRA-357 In OpenShift 4 Beta on AWS, it is not possible, by default, to access a TCP or HTTPS service through the ingress gateway on a port other than port 80. The AWS load balancer has a health check that verifies if port 80 on the service endpoint is active.

    The load balancer health check only checks the first port defined in the Istio ingress gateway ports list. This port is configured as 80/HTTP:31380/TCP. Without a service running on this port, the load balancer health check fails.

    To check HTTPS or TCP traffic by using an ingress gateway, you must have an existing HTTP service, for example, the Bookinfo sample application product page running on the ingress gateway port 80. Alternatively, using the AWS EC2 console, you can change the port that the load balancer uses to perform the health check, and replace 80 with the port your service actually uses.

6.5.2. Kiali fixed issues

  • KIALI-3096 Runtime metrics fail in Service Mesh. There is an oauth filter between the Service Mesh and Prometheus, requiring a bearer token to be passed to Prometheus before access will be granted. Kiali has been updated to use this token when communicating to the Prometheus server, but the application metrics are currently failing with 403 errors.
  • OSSM-90 Traces not available on the service details page.
  • OSSM-92 Cancelling unsaved changes on the VS/DR YAML edit page does not cancel the changes.
  • OSSM-93 IstioConfigList can’t filter by two or more names.
  • OSSM-99 Workloads generated from direct Pod without labels may crash Kiali.