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https://github.com/istio/istio

Connect, secure, control, and observe services.
https://github.com/istio/istio

api-management circuit-breaker consul enforce-policies envoy fault-injection kubernetes lyft-envoy microservice microservices nomad polyglot-microservices proxies request-routing resiliency service-mesh

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Connect, secure, control, and observe services.

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README 

        
# Istio



[![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/1395/badge)](https://bestpractices.coreinfrastructure.org/projects/1395)

[![Go Report Card](https://goreportcard.com/badge/github.com/istio/istio)](https://goreportcard.com/report/github.com/istio/istio)

[![GoDoc](https://godoc.org/istio.io/istio?status.svg)](https://godoc.org/istio.io/istio)





    Istio logo




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Istio is an open source service mesh that layers transparently onto existing distributed applications. Istio’s powerful features provide a uniform and more efficient way to secure, connect, and monitor services. Istio is the path to load balancing, service-to-service authentication, and monitoring – with few or no service code changes.



- For in-depth information about how to use Istio, visit [istio.io](https://istio.io)

- To ask questions and get assistance from our community, visit [Github Discussions](https://github.com/istio/istio/discussions)

- To learn how to participate in our overall community, visit [our community page](https://istio.io/about/community)



In this README:



- [Introduction](#introduction)

- [Repositories](#repositories)

- [Issue management](#issue-management)



In addition, here are some other documents you may wish to read:



- [Istio Community](https://github.com/istio/community#istio-community) - describes how to get involved and contribute to the Istio project

- [Istio Developer's Guide](https://github.com/istio/istio/wiki/Preparing-for-Development) - explains how to set up and use an Istio development environment

- [Project Conventions](https://github.com/istio/istio/wiki/Development-Conventions) - describes the conventions we use within the code base

- [Creating Fast and Lean Code](https://github.com/istio/istio/wiki/Writing-Fast-and-Lean-Code) - performance-oriented advice and guidelines for the code base



You'll find many other useful documents on our [Wiki](https://github.com/istio/istio/wiki).



## Introduction



[Istio](https://istio.io/latest/docs/concepts/what-is-istio/) is an open platform for providing a uniform way to [integrate

microservices](https://istio.io/latest/docs/examples/microservices-istio/), manage [traffic flow](https://istio.io/latest/docs/concepts/traffic-management/) across microservices, enforce policies

and aggregate telemetry data. Istio's control plane provides an abstraction

layer over the underlying cluster management platform, such as Kubernetes.



Istio is composed of these components:



- **Envoy** - Sidecar proxies per microservice to handle ingress/egress traffic

   between services in the cluster and from a service to external

   services. The proxies form a _secure microservice mesh_ providing a rich

   set of functions like discovery, rich layer-7 routing, circuit breakers,

   policy enforcement and telemetry recording/reporting

   functions.



  > Note: The service mesh is not an overlay network. It

  > simplifies and enhances how microservices in an application talk to each

  > other over the network provided by the underlying platform.



- **Istiod** - The Istio control plane. It provides service discovery, configuration and certificate management. It consists of the following sub-components:



    - **Pilot** - Responsible for configuring the proxies at runtime.



    - **Citadel** - Responsible for certificate issuance and rotation.



    - **Galley** - Responsible for validating, ingesting, aggregating, transforming and distributing config within Istio.



- **Operator** - The component provides user friendly options to operate the Istio service mesh.



## Repositories



The Istio project is divided across a few GitHub repositories:



- [istio/api](https://github.com/istio/api). This repository defines

component-level APIs and common configuration formats for the Istio platform.



- [istio/community](https://github.com/istio/community). This repository contains

information on the Istio community, including the various documents that govern

the Istio open source project.



- [istio/istio](README.md). This is the main code repository. It hosts Istio's

core components, install artifacts, and sample programs. It includes:



    - [istioctl](istioctl/). This directory contains code for the

[_istioctl_](https://istio.io/latest/docs/reference/commands/istioctl/) command line utility.



    - [pilot](pilot/). This directory

contains platform-specific code to populate the

[abstract service model](https://istio.io/docs/concepts/traffic-management/#pilot), dynamically reconfigure the proxies

when the application topology changes, as well as translate

[routing rules](https://istio.io/latest/docs/reference/config/networking/) into proxy specific configuration.



    - [security](security/). This directory contains [security](https://istio.io/latest/docs/concepts/security/) related code,

including Citadel (acting as Certificate Authority), citadel agent, etc.



- [istio/proxy](https://github.com/istio/proxy). The Istio proxy contains

extensions to the [Envoy proxy](https://github.com/envoyproxy/envoy) (in the form of

Envoy filters) that support authentication, authorization, and telemetry collection.



- [istio/ztunnel](https://github.com/istio/ztunnel). The repository contains the Rust implementation of the ztunnel

component of Ambient mesh.



- [istio/client-go](https://github.com/istio/client-go). This repository defines

  auto-generated Kubernetes clients for interacting with Istio resources programmatically.



> [!NOTE]

> Only the `istio/api` and `istio/client-go` repositories expose stable interfaces intended for direct usage as libraries.



## Issue management



We use GitHub to track all of our bugs and feature requests. Each issue we track has a variety of metadata:



- **Epic**. An epic represents a feature area for Istio as a whole. Epics are fairly broad in scope and are basically product-level things.

Each issue is ultimately part of an epic.



- **Milestone**. Each issue is assigned a milestone. This is 0.1, 0.2, ..., or 'Nebulous Future'. The milestone indicates when we

think the issue should get addressed.



- **Priority**. Each issue has a priority which is represented by the column in the [Prioritization](https://github.com/orgs/istio/projects/6) project. Priority can be one of

P0, P1, P2, or >P2. The priority indicates how important it is to address the issue within the milestone. P0 says that the

milestone cannot be considered achieved if the issue isn't resolved.



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    Cloud Native Computing Foundation logo

    
Istio is a Cloud Native Computing Foundation project.