Update Istio charts 1.21.6+0

charts/istio/1.21.6+tetrate0/README.md

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+# Istio Installer
+
+Note: If making any changes to the charts or values.yaml in this dir, first read [UPDATING-CHARTS.md](UPDATING-CHARTS.md)
+
+Istio installer is a modular, 'a-la-carte' installer for Istio. It is based on a
+fork of the Istio helm templates, refactored to increase modularity and isolation.
+
+Goals:
+- Improve upgrade experience: users should be able to gradually roll upgrades, with proper
+canary deployments for Istio components. It should be possible to deploy a new version while keeping the
+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.
+
+- Better security: separate Istio components reside in different namespaces, allowing different teams or
+roles to manage different parts of Istio. For example, a security team would maintain the
+root CA and policy, a telemetry team may only have access to Prometheus,
+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.
+
+`istioctl kube-inject` or the automatic sidecar injector are used to select the environment.
+In the case of the sidecar injector, the namespace label `istio-env: <NAME_OF_ENV>` is used instead
+of the conventional `istio-injected: true`. The name of the environment is defined as the namespace
+where the corresponding control plane components (config, discovery, auto-injection) are running.
+In the examples below, by default this is the `istio-control` namespace. Pod annotations can also
+be used to select a different 'environment'.
+
+## Installing
+
+The new installer is intended to be modular and very explicit about what is installed. It has
+far more steps than the Istio installer - but each step is smaller and focused on a specific
+feature, and can be performed by different people/teams at different times.
+
+It is strongly recommended that different namespaces are used, with different service accounts.
+In particular access to the security-critical production components (root CA, policy, control)
+should be locked down and restricted.  The new installer allows multiple instances of
+policy/control/telemetry - so testing/staging of new settings and versions can be performed
+by a different role than the prod version.
+
+The intended users of this repo are users running Istio in production who want to select, tune
+and understand each binary that gets deployed, and select which combination to use.
+
+Note: each component can be installed in parallel with an existing Istio 1.0 or 1.1 installation in
+`istio-system`. The new components will not interfere with existing apps, but can interoperate,
+and it is possible to gradually move apps from Istio 1.0/1.1 to the new environments and
+across environments ( for example canary -> prod )
+
+Note: there are still some cluster roles that may need to be fixed, most likely cluster permissions
+will need to move to the security component.
+
+## Everything is Optional
+
+Each component in the new installer is optional. Users can install the component defined in the new installer,
+use the equivalent component in `istio-system`, configured with the official installer, or use a different
+version or implementation.
+
+For example you may use your own Prometheus and Grafana installs, or you may use a specialized/custom
+certificate provisioning tool, or use components that are centrally managed and running in a different cluster.
+
+This is a work in progress - building on top of the multi-cluster installer.
+
+As an extreme, the goal is to be possible to run Istio workloads in a cluster without installing any Istio component
+in that cluster. Currently, the minimum we require is the security provider (node agent or citadel).
+
+### Install Istio CRDs
+
+This is the first step of the installation. Please do not remove or edit any CRD - config currently requires
+all CRDs to be present. On each upgrade it is recommended to reapply the file, to make sure
+you get all CRDs.  CRDs are separated by release and by component type in the CRD directory.
+
+Istio has strong integration with certmanager.  Some operators may want to keep their current certmanager
+CRDs in place and not have Istio modify them.  In this case, it is necessary to apply CRD files individually.
+
+```bash
+kubectl apply -k github.com/istio/installer/base
+```
+
+or
+
+```bash
+kubectl apply -f base/files
+```
+
+### Install Istio-CNI
+
+This is an optional step - CNI must run in a dedicated namespace, it is a 'singleton' and extremely
+security sensitive. Access to the CNI namespace must be highly restricted.
+
+**NOTE:** The environment variable `ISTIO_CLUSTER_ISGKE` is assumed to be set to `true` if the cluster
+is a GKE cluster.
+
+```bash
+ISTIO_CNI_ARGS=
+# TODO: What k8s data can we use for this check for whether GKE?
+if [[ "${ISTIO_CLUSTER_ISGKE}" == "true" ]]; then
+    ISTIO_CNI_ARGS="--set cni.cniBinDir=/home/kubernetes/bin"
+fi
+iop kube-system istio-cni $IBASE/istio-cni/ ${ISTIO_CNI_ARGS}
+```
+
+TODO. It is possible to add Istio-CNI later, and gradually migrate.
+
+### Install Control plane
+
+This can run in any cluster. A mesh should have at least one cluster should run Pilot or equivalent XDS server,
+and it is recommended to have Pilot running in each region and in multiple availability zones for multi cluster.
+
+```bash
+iop istio-control istio-discovery $IBASE/istio-control/istio-discovery \
+            --set global.istioNamespace=istio-system
+
+# Second istio-discovery, using master version of istio
+TAG=latest HUB=gcr.io/istio-testing iop istio-master istio-discovery-master $IBASE/istio-control/istio-discovery \
+            --set policy.enable=false \
+            --set global.istioNamespace=istio-master
+```
+
+### Gateways
+
+A cluster may use multiple Gateways, each with a different load balancer IP, domains and certificates.
+
+Since the domain certificates are stored in the gateway namespace, it is recommended to keep each
+gateway in a dedicated namespace and restrict access.
+
+For large-scale gateways it is optionally possible to use a dedicated pilot in the gateway namespace.
+
+### Additional test templates
+
+A number of helm test setups are general-purpose and should be installable in any cluster, to confirm
+Istio works properly and allow testing the specific installation.

charts/istio/1.21.6+tetrate0/UPDATING-CHARTS.md

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+# Updating charts and values.yaml
+
+## Acceptable Pull Requests
+
+Helm charts `values.yaml` represent a complex user facing API that tends to grow uncontrollably over time
+due to design choices in Helm.
+The underlying Kubernetes resources we configure have 1000s of fields; given enough users and bespoke use cases,
+eventually someone will want to customize every one of those fields.
+If all fields are exposed in `values.yaml`, we end up with an massive API that is also likely worse than just using the Kubernetes API directly.
+
+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.
+
+If the change is to a Kubernetes field (such as modifying a Deployment attribute), it will likely need to be install-time configuration.
+However, that doesn't necessarily mean a PR to add a value will be accepted.
+The `values.yaml` API is intended to maintain a *minimal core set of configuration* that most users will use.
+For bespoke use cases, [Helm Chart Customization](https://istio.io/latest/docs/setup/additional-setup/customize-installation-helm/#advanced-helm-chart-customization) can be used
+to allow arbitrary customizations.
+
+If the change truly is generally purpose, it is generally preferred to have broader APIs. For example, instead of providing
+direct access to each of the complex fields in [affinity](https://kubernetes.io/docs/concepts/scheduling-eviction/assign-pod-node/), just providing
+a single `affinity` field that is passed through as-is to the Kubernetes resource.
+This provides maximum flexibility with minimal API surface overhead.
+
+## Making changes
+
+## Step 1. Make changes in charts and values.yaml in `manifests` directory
+
+Be sure to provide sufficient documentation and example usage in values.yaml.
+If the chart has a `values.schema.json`, that should be updated as well.
+
+## Step 2. Update the istioctl/Operator values
+
+If you are modifying the `gateway` chart, you can stop here.
+All other charts, however, are exposed by `istioctl` and need to follow the steps below.
+
+The charts in the `manifests` directory are used in istioctl to generate an installation manifest.
+
+If `values.yaml` is changed, be sure to update corresponding values changes in [../profiles/default.yaml](../profiles/default.yaml)
+
+## Step 3. Update istioctl schema
+
+Istioctl uses a [schema](../../operator/pkg/apis/istio/v1alpha1/values_types.proto) to validate the values. Any changes to
+the schema must be added here, otherwise istioctl users will see errors.
+Once the schema file is updated, run:
+
+```bash
+$ make operator-proto
+```
+
+This will regenerate the Go structs used for schema validation.
+
+## Step 4. Update the generated manifests
+
+Tests of istioctl use the auto-generated manifests to ensure that the istioctl binary has the correct version of the charts.
+To regenerate the manifests, run:
+
+```bash
+$ make copy-templates update-golden
+```
+
+## Step 5. Create a PR using outputs from Steps 1 to 4
+
+Your PR should pass all the checks if you followed these steps.

charts/istio/1.21.6+tetrate0/base/Chart.yaml

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+apiVersion: v1
+name: base
+# This version is never actually shipped. istio/release-builder will replace it at build-time
+# with the appropriate version
+version: 1.21.6+tetrate0
+appVersion: 1.21.6-tetrate0
+tillerVersion: ">=2.7.2"
+description: Helm chart for deploying Istio cluster resources and CRDs
+keywords:
+  - istio
+sources:
+  - https://github.com/istio/istio
+engine: gotpl
+icon: https://istio.io/latest/favicons/android-192x192.png

charts/istio/1.21.6+tetrate0/base/README.md

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+# Istio base Helm Chart
+
+This chart installs resources shared by all Istio revisions. This includes Istio CRDs.
+
+## Setup Repo Info
+
+```console
+helm repo add istio https://istio-release.storage.googleapis.com/charts
+helm repo update
+```
+
+_See [helm repo](https://helm.sh/docs/helm/helm_repo/) for command documentation._
+
+## Installing the Chart
+
+To install the chart with the release name `istio-base`:
+
+```console
+kubectl create namespace istio-system
+helm install istio-base istio/base -n istio-system
+```
+
+### Profiles
+
+Istio Helm charts have a concept of a `profile`, which is a bundled collection of value presets.
+These can be set with `--set profile=<profile>`.
+For example, the `demo` profile offers a preset configuration to try out Istio in a test environment, with additional features enabled and lowered resource requirements.
+
+For consistency, the same profiles are used across each chart, even if they do not impact a given chart.
+
+Explicitly set values have highest priority, then profile settings, then chart defaults.
+
+As an implementation detail of profiles, the default values for the chart are all nested under `defaults`.
+When configuring the chart, you should not include this.
+That is, `--set some.field=true` should be passed, not `--set defaults.some.field=true`.