This is a major release for Istio on the road to 1.0. There are a great many new features and architectural improvements in addition to the usual pile of bug fixes and performance improvements.
Revamped Traffic Management Model. We’re finally ready to take the wraps off our new traffic management APIs. We believe this new model is easier to understand while covering more real world deployment use-cases. For folks upgrading from earlier releases there is a migration guide and a conversion tool built into
istioctlto help convert your configuration from the old model.
Streaming Envoy configuration. By default Pilot now streams configuration to Envoy using its ADS API. This new approach increases effective scalability, reduces rollout delay and should eliminate spurious 404 errors.
Gateway for Ingress/Egress. We no longer support combining Kubernetes Ingress specs with Istio routing rules as it has led to several bugs and reliability issues. Istio now supports a platform independent Gateway model for ingress & egress proxies that works across Kubernetes and Cloud Foundry and works seamlessly with routing. The Gateway supports Server Name Indication based routing, as well as serving a certificate based on the server name presented by the client.
Constrained Inbound Ports. We now restrict the inbound ports in a pod to the ones declared by the apps running inside that pod.
Introducing Citadel. We’ve finally given a name to our security component. What was formerly known as Istio-Auth or Istio-CA is now called Citadel.
Multicluster Support. We support per-cluster Citadel in multicluster deployments such that all Citadels share the same root certificate and workloads can authenticate each other across the mesh.
Authentication Policy. We’ve created a unified API for authentication policy that controls whether service-to-service communication uses mutual TLS as well as end user authentication. This is now the recommended way to control these behaviors.
- Self-Reporting. Mixer and Pilot now produce telemetry that flows through the normal Istio telemetry pipeline, just like services in the mesh.
- A la Carte Istio. Istio has a rich set of features, however you don’t need to install or consume them all together. By using
istioctl gen-deploy, users can install only the features they want. For example, users can install Pilot only and enjoy traffic management functionality without dealing with Mixer or Citadel.
- CloudWatch. Mixer can now report metrics to AWS CloudWatch. Learn more
Known issues with 0.8
A gateway with virtual services pointing to a headless service won’t work (Issue #5005).
There is a problem with Google Kubernetes Engine 1.10.2. The workaround is to use Kubernetes 1.9 or switch the node image to Ubuntu. A fix is expected in GKE 1.10.4.
There is a known namespace issue with
istioctl experimental convert-networking-configtool where the desired namespace may be changed to the
istio-systemnamespace, please manually adjust to use the desired namespace after running the conversation tool. Learn more