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What even is an Istio? If nothing else you’ve probably heard that Istio is a service mesh. “Service mesh” is a fancy term for tooling that handles common communication challenges between a collection of connected services.
In real world terms, Istio’s features build on the power of Kubernetes adding:
Mutual TLS for identification, authorization, and encrypted communication between services. Outbound traffic restriction with selective whitelisting. Dynamic traffic distribution patterns such as concurrent application versions and gradual canary-style roll-outs. Improved resiliency with circuit breakers, retry handling, fail over, and support for “Chaos Monkey” style fault injection testing. A ton of additional metrics that illuminate communication patterns and performance. Istio accomplishes all of this by running an individual proxy sidecar container inside each of your pods. A set of core services run in your cluster and communicate with these proxy sidecars to enable the features described above.
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