defaultConfig:
  discoveryAddress: istiod-rev-1.istio-system.svc:15012
  proxyMetadata:
    CANONICAL_REVISION: latest
    CANONICAL_SERVICE: foo
    CLUSTER_MESH_CONFIG_VALUE: foo
    ISTIO_META_CLUSTER_ID: Kubernetes
    ISTIO_META_DNS_CAPTURE: "true"
    ISTIO_META_MESH_ID: ""
    ISTIO_META_NETWORK: ""
    ISTIO_META_WORKLOAD_NAME: foo
    ISTIO_METAJSON_LABELS: '{"service.istio.io/canonical-name":"foo","service.istio.io/canonical-revision":"latest"}'

defaultConfig:
  discoveryAddress: istiod-rev-1.istio-system.svc:15012
  proxyMetadata:
    CANONICAL_REVISION: latest
    CANONICAL_SERVICE: foo
    CLUSTER_MESH_CONFIG_VALUE: foo
    ISTIO_META_CLUSTER_ID: Kubernetes
    ISTIO_META_DNS_CAPTURE: "true"
    ISTIO_META_MESH_ID: ""
    ISTIO_META_NETWORK: ""
    ISTIO_META_WORKLOAD_NAME: foo
    ISTIO_METAJSON_LABELS: '{"service.istio.io/canonical-name":"foo","service.istio.io/canonical-revision":"latest"}'

defaultConfig:
  proxyMetadata:
    CANONICAL_REVISION: latest
    CANONICAL_SERVICE: foo
    ISTIO_META_CLUSTER_ID: Kubernetes
    ISTIO_META_DNS_CAPTURE: "true"
    ISTIO_META_MESH_ID: ""
    ISTIO_META_NETWORK: ""
    ISTIO_META_WORKLOAD_NAME: foo
    ISTIO_METAJSON_LABELS: '{"service.istio.io/canonical-name":"foo","service.istio.io/canonical-revision":"latest"}'
    POD_NAMESPACE: bar
    SERVICE_ACCOUNT: vm-serviceaccount
    TRUST_DOMAIN: ""

ISTIO_LOCAL_EXCLUDE_PORTS='22,15090,15021,15020'
ISTIO_METAJSON_LABELS='{"service.istio.io/canonical-name":"foo","service.istio.io/canonical-revision":"latest"}'
ISTIO_META_CLUSTER_ID='Kubernetes'
ISTIO_META_DNS_CAPTURE='true'
ISTIO_META_MESH_ID=''
ISTIO_META_NETWORK=''
ISTIO_META_WORKLOAD_NAME='foo'
ISTIO_NAMESPACE='bar'
ISTIO_SERVICE='foo.bar'
ISTIO_SERVICE_CIDR='*'
ISTIO_SVC_IP='10.10.10.10'
POD_NAMESPACE='bar'
SERVICE_ACCOUNT='vm-serviceaccount'

To avoid this, the project attempts to minimize additions to the `values.yaml` API where possible.

If the change is a dynamic runtime configuration, it probably belongs in the [MeshConfig API](https://github.com/istio/api/blob/master/mesh/v1alpha1/config.proto).
This allows configuration without re-installing or restarting deployments.

CANONICAL_SERVICE='foo'
CA_ADDR='istiod-rev-1.istio-system.svc:15012'
CLUSTER_MESH_CONFIG_VALUE='foo'
ISTIO_INBOUND_PORTS='*'
ISTIO_LOCAL_EXCLUDE_PORTS='22,15090,15021,15020'
ISTIO_METAJSON_LABELS='{"service.istio.io/canonical-name":"foo","service.istio.io/canonical-revision":"latest"}'
ISTIO_META_CLUSTER_ID='Kubernetes'
ISTIO_META_DNS_CAPTURE='true'
ISTIO_META_MESH_ID=''
ISTIO_META_NETWORK=''
ISTIO_META_WORKLOAD_NAME='foo'
ISTIO_NAMESPACE='bar'

When configuring the chart, you should not include this.
That is, `--set some.field=true` should be passed, not `--set defaults.some.field=true`.

### 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

   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

CANONICAL_SERVICE='foo'
CA_ADDR='istiod-rev-1.istio-system.svc:15012'
CLUSTER_MESH_CONFIG_VALUE='foo'
ISTIO_INBOUND_PORTS='*'
ISTIO_LOCAL_EXCLUDE_PORTS='22,15090,15021,15020'
ISTIO_METAJSON_LABELS='{"service.istio.io/canonical-name":"foo","service.istio.io/canonical-revision":"latest"}'
ISTIO_META_CLUSTER_ID='Kubernetes'
ISTIO_META_DNS_CAPTURE='true'
ISTIO_META_MESH_ID=''
ISTIO_META_NETWORK=''
ISTIO_META_WORKLOAD_NAME='foo'
ISTIO_NAMESPACE='bar'

stable version in place and gradually migrate apps to the new version.

- More flexibility: the new installer allows multiple 'environments', allowing applications to select
a set of control plane settings and components. While the entire mesh respects the same APIs and config,
apps may target different 'environments' which contain different instances and variants of Istio.