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Istio is an open platform to connect, secure, and manage a network of microservices, also known as a service mesh, on cloud platforms such as Kubernetes in the IBM Cloud Kubernetes Service. With Istio, You can manage network traffic, load balance across microservices, enforce access policies, verify service identity on the service mesh, and more.
In this course, you learn how to install Istio alongside microservices for a simple mock application called Guestbook. When you deploy Guestbook’s microservices into an IBM Cloud Kubernetes Service cluster where Istio is installed, you inject the Istio Envoy sidecar proxies in the pods of each microservice.
Lab 1: Observe service telemetry – metrics and tracing
Question: You must modify your apps to get metrics for those apps.
Question: You must modify your apps to get distributed tracing for those apps to work properly.
Question: What distributed tracing system does Istio support by default?
Question: In a SOA architecture that uses traditional debugging techniques, as requests pass through multiple services, identifying performance bottlenecks becomes increasingly difficult.
Lab 2: Expose the service mesh with the Istio Ingress controller
Question: The components deployed on the service mesh by default are not exposed outside the cluster.
Question: In a Kubernetes environment, Istio uses what component to configure ingress behavior?
Question: Ingress can provide load balancing, SSL termination, and name-based virtual hosting.
Question: What is an ingress?
Lab 3: Manage traffic
Question: Where are routing rules defined?
Question: Where are service versions (subsets) defined?
Question: Which Istio component is responsible for sending traffic management configurations to Istio sidecars?
Question: A ServiceEntry rule describes which of the following three items?
Lab 4: Secure your services
Question: Citadel provides each microservice with a strong, cryptographic identity in the form of a certificate. The certificate’s lifecycle is fully managed by Istio.
Question: Istio provides microservices with mutually authenticated connections without requiring app code changes.
Question: Mutual authentication must be on or off for the entire cluster; gradual adoption is not possible.
Question: Citadel is not directly responsible for which one of these items?
Lab 5: Enforce policies for microservices
Question: Creating Mixer rules requires app code changes.
Question: What is the name of the custom code that interacts with the back-end system, such as Prometheus?
Question: Istio Mixer moves policy decisions under operator control rather than into configuration.
Question: Mixer is not responsible for interfacing with the back-end systems.
Question: What is a service mesh?
Question: Which of these features is provided by Istio? Select all the apply.
Question: Microservices that are deployed in Istio can communicate to services outside of Istio.
Question: Which Istio function normally requires users to modify their applications?
Question: Which Istio component is always required even when you install only certain Istio features?
Question: Which Istio component is part of the Istio service mesh data plane?
Question: Which Istio features allow you to configure per namespace?
Question: To use Istio, a service must run in Kubernetes.
Question: What’s the purpose of a sidecar container in Kubernetes?
Question: What Istio component primarily manages telemetry?
Question: What is an Envoy?
Question: What component is primarily responsible for traffic management?
Question: A VirtualService defines policies that apply to traffic intended for a service after routing has occurred.
Question: ServiceEntry configuration enables services within the mesh to access a service not necessarily managed by Istio.
Question: A/B testing is a method of performing identical tests against two separate service versions to determine which performs better.
Question: Telemetry in Istio can help you to pinpoint latency problems in microservices.
Question: What is the default sidecar proxy in Istio?
Question: With what Istio component can you use to write custom adapters for tracing and metrics?
Question: Istio can secure the communication between microservices without requiring app code changes.
Question: In this course, what is an ingress?
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