[proto](https://github.com/istio/api/blob/master/operator/v1alpha1/operator.proto) and
compiled to [Go
structs](https://github.com/istio/api/blob/master/operator/v1alpha1/operator.pb.go).
`IstioOperatorSpec` has pass-through fields to the Helm values.yaml API, but these are additionally validated through
a [schema](../operator/pkg/apis/istio/v1alpha1/values_types.proto).

meeting to share your ideas.

This document is an overview of how the operator works from a user perspective. For more details about the design and
architecture and a code overview, see [ARCHITECTURE.md](../architecture/environments/operator.md).

## Introduction

The operator uses the [IstioOperator API](https://github.com/istio/api/blob/master/operator/v1alpha1/operator.proto), which has
three main components:

	"istio.io/istio/operator/pkg/util/clog"
	"istio.io/istio/operator/pkg/util/progress"
	"istio.io/istio/operator/pkg/verifier"
	pkgversion "istio.io/istio/operator/pkg/version"
	operatorVer "istio.io/istio/operator/version"
	"istio.io/istio/pkg/art"
	"istio.io/istio/pkg/config/constants"
	"istio.io/istio/pkg/config/labels"
	"istio.io/istio/pkg/kube"
)

type InstallArgs struct {

	"istio.io/istio/istioctl/pkg/cli"
	"istio.io/istio/operator/pkg/apis/istio/v1alpha1"
	"istio.io/istio/operator/pkg/cache"
	"istio.io/istio/operator/pkg/helmreconciler"
	"istio.io/istio/operator/pkg/manifest"
	"istio.io/istio/operator/pkg/name"
	"istio.io/istio/operator/pkg/object"
	"istio.io/istio/operator/pkg/util/clog"
	"istio.io/istio/pkg/config/constants"
	"istio.io/istio/pkg/kube"

	"k8s.io/apimachinery/pkg/runtime"

	"istio.io/istio/istioctl/pkg/cli"
	operatoristio "istio.io/istio/operator/pkg/apis/istio"
	istioV1Alpha1 "istio.io/istio/operator/pkg/apis/istio/v1alpha1"
	"istio.io/istio/operator/pkg/name"
	"istio.io/istio/operator/pkg/util"
	operatorvalidate "istio.io/istio/operator/pkg/validate"
	"istio.io/istio/pkg/config"
	"istio.io/istio/pkg/config/constants"
	"istio.io/istio/pkg/config/protocol"

  labels:
{{ $gateway.labels | toYaml | indent 4 }}
    release: {{ .Release.Name }}
    istio.io/rev: {{ .Values.revision | default "default" | quote }}
    install.operator.istio.io/owning-resource: {{ .Values.ownerName | default "unknown" }}
    operator.istio.io/component: "IngressGateways"
spec:
{{- if not $gateway.autoscaleEnabled }}
{{- if $gateway.replicaCount }}
  replicas: {{ $gateway.replicaCount }}
{{- end }}
{{- end }}

    logging:
      level: "default:info"

    omitSidecarInjectorConfigMap: false

    # Configure whether Operator manages webhook configurations. The current behavior
    # of Istiod is to manage its own webhook configurations.
    # When this option is set as true, Istio Operator, instead of webhooks, manages the
    # webhook configurations. When this option is set as false, webhooks manage their

  // react to an unknown operator by assuming the requirement is not satisfied.
  optional string operator = 2;

  // Specifies the set of values. Each returned container exit code (might be
  // multiple in case of multiple containers) is checked against this set of
  // values with respect to the operator. The list of values must be ordered

  // associated with "runlevel" of "0" or "1";  you will set the selector as
  // follows:
  // "namespaceSelector": {
  //   "matchExpressions": [
  //     {
  //       "key": "runlevel",
  //       "operator": "NotIn",
  //       "values": [
  //         "0",
  //         "1"
  //       ]
  //     }
  //   ]
  // }
  //
  // If instead you want to only run the webhook on any objects whose

	"istio.io/istio/istioctl/pkg/cli"
	"istio.io/istio/istioctl/pkg/clioptions"
	"istio.io/istio/istioctl/pkg/util"
	iopv1alpha1 "istio.io/istio/operator/pkg/apis/istio/v1alpha1"
	"istio.io/istio/operator/pkg/manifest"
	"istio.io/istio/operator/pkg/validate"
	"istio.io/istio/pkg/config/mesh"
	"istio.io/istio/pkg/kube"
	"istio.io/istio/pkg/kube/inject"
	"istio.io/istio/pkg/log"
	"istio.io/istio/pkg/util/protomarshal"