# Istio Agent

This document describes the internal architecture of Istio agent.

## High Level overview

![High Level overview](docs/overview.svg)

At a high level, the Istio agent acts as an intermediate proxy between Istiod and Envoy. This is done
at two levels. For distributing workload certificates, Envoy will send [SDS](https://www.envoyproxy.io/docs/envoy/latest/configuration/security/secret)

    <modelVersion>4.0.0</modelVersion>

    <groupId>org.apache.maven.its</groupId>
    <artifactId>parent</artifactId>
    <version>0.1</version>
    <packaging>pom</packaging>

    <name>Maven Integration Test :: Dummy Parent</name>

    <build>
        <pluginManagement>
            <plugins>
                <plugin>

    <modelVersion>4.0.0</modelVersion>

    <groupId>org.apache.maven.its</groupId>
    <artifactId>parent</artifactId>
    <version>0.1</version>
    <packaging>pom</packaging>

    <name>Maven Integration Test :: Dummy Parent</name>

    <build>
        <pluginManagement>
            <plugins>
                <plugin>

  <modelVersion>4.0.0</modelVersion>

  <groupId>org.hamcrest</groupId>
  <artifactId>hamcrest-parent</artifactId>
  <version>1.3</version>
  <packaging>pom</packaging>

  <name>Hamcrest Maven Parent</name>
  <url>https://github.com/hamcrest/JavaHamcrest</url>
  <description>General parent POM for all hamcrest libraries.</description>

  <licenses>
    <license>
      <name>New BSD License</name>

  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>org.apache</groupId>
    <artifactId>apache</artifactId>
    <version>3</version>
    <relativePath>../asf/pom.xml</relativePath>
  </parent>
  <groupId>org.apache.maven</groupId>
  <artifactId>maven-parent</artifactId>
  <version>5</version>
  <packaging>pom</packaging>
  <name>Apache Maven</name>

  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>org.apache</groupId>
    <artifactId>apache</artifactId>
    <version>3</version>
    <relativePath>../asf/pom.xml</relativePath>
  </parent>
  <groupId>org.apache.maven</groupId>
  <artifactId>maven-parent</artifactId>
  <version>4</version>
  <packaging>pom</packaging>
  <name>Apache Maven</name>

  {{- end }}
  {{- if .Values.global.logAsJson }}
    - --log_as_json
  {{- end }}
    lifecycle:
      postStart:
        exec:
          command:
          - pilot-agent
          - wait
          - --url=http://localhost:15020/healthz/ready
    env:
    - name: ISTIO_META_GENERATOR
      value: grpc
    - name: OUTPUT_CERTS
      value: /var/lib/istio/data

    }

    @Override
    public boolean contains(@CheckForNull Object target) {
      return indexOf(target) >= 0;
    }

    @Override
    public int indexOf(@CheckForNull Object target) {
      return target instanceof Integer ? parent.indexOf((Integer) target) : -1;
    }

    @Override
    public int lastIndexOf(@CheckForNull Object target) {

      return indexOf(target) >= 0;
    }

    @Override
    public int indexOf(@CheckForNull Object target) {
      return target instanceof Double ? parent.indexOf((Double) target) : -1;
    }

    @Override
    public int lastIndexOf(@CheckForNull Object target) {
      return target instanceof Double ? parent.lastIndexOf((Double) target) : -1;
    }

    @Override

    public boolean contains(@CheckForNull Object target) {
      return indexOf(target) >= 0;
    }

    @Override
    public int indexOf(@CheckForNull Object target) {
      return target instanceof Long ? parent.indexOf((Long) target) : -1;
    }

    @Override
    public int lastIndexOf(@CheckForNull Object target) {
      return target instanceof Long ? parent.lastIndexOf((Long) target) : -1;
    }

    @Override