defaults:
  global:

    # ImagePullSecrets for control plane ServiceAccount, list of secrets in the same namespace
    # to use for pulling any images in pods that reference this ServiceAccount.
    # Must be set for any cluster configured with private docker registry.
    imagePullSecrets: []

    # Used to locate istiod.
    istioNamespace: istio-system

    externalIstiod: false
    remotePilotAddress: ""

### Examples

#### Configuring mesh configuration settings

Any [Mesh Config](https://istio.io/latest/docs/reference/config/istio.mesh.v1alpha1/) options can be configured like below:

```yaml
meshConfig:
  accessLogFile: /dev/stdout
```

#### Revisions

Control plane revisions allow deploying multiple versions of the control plane in the same cluster.

			return cniConfigFilepath, err
		}
		cniConfigFilepath += "list"
	}

	installLog.Infof("Created CNI config %s", cniConfigFilepath)
	return cniConfigFilepath, nil
}

// If configured as chained CNI plugin, waits indefinitely for a main CNI config file to exist before returning
// Or until cancelled by parent context
func getCNIConfigFilepath(ctx context.Context, cfg pluginConfig) (string, error) {

  // An empty or nil nodeSelector selects all nodes.
  // This field is immutable.
  // +optional
  optional k8s.io.api.core.v1.NodeSelector nodeSelector = 1;

  // perNodeHostBits defines the number of host bits to be configured per node.
  // A subnet mask determines how much of the address is used for network bits
  // and host bits. For example an IPv4 address of 192.168.0.0/24, splits the

  // to SingleStack. Services can be "SingleStack" (a single IP family),
  // "PreferDualStack" (two IP families on dual-stack configured clusters or
  // a single IP family on single-stack clusters), or "RequireDualStack"
  // (two IP families on dual-stack configured clusters, otherwise fail). The
  // ipFamilies and clusterIPs fields depend on the value of this field. This

  // can scale down.  It defaults to 1 pod.  minReplicas is allowed to be 0 if the
  // alpha feature gate HPAScaleToZero is enabled and at least one Object or External
  // metric is configured.  Scaling is active as long as at least one metric value is
  // available.
  // +optional
  optional int32 minReplicas = 2;

  // can scale down.  It defaults to 1 pod.  minReplicas is allowed to be 0 if the
  // alpha feature gate HPAScaleToZero is enabled and at least one Object or External
  // metric is configured.  Scaling is active as long as at least one metric value is
  // available.
  // +optional
  optional int32 minReplicas = 2;

              peers:
                description: Peers limits the bgppeer to advertise the ips of the
                  selected pools to. When empty, the loadbalancer IP is announced
                  to all the BGPPeers configured.
                items:
                  type: string
                type: array
            type: object
          status:

defaults:
  hub: gcr.io/istio-testing
  tag: latest

  # ImagePullSecrets for operator ServiceAccount, list of secrets in the same namespace
  # used to pull operator image. Must be set for any cluster configured with private docker registry.
  imagePullSecrets: []

  # Specify image pull policy if default behavior isn't desired.
  # Default behavior: latest images will be Always else IfNotPresent.
  imagePullPolicy: ""

and a different team may maintain the control plane components (which are highly security sensitive).

The install is organized in 'environments' - each environment consists of a set of components
in different namespaces that are configured to work together. Regardless of 'environment',
workloads can talk with each other and obey the Istio configuration resources, but each environment
can use different Istio versions and different configuration defaults.