// used rather than just deleting the webhook since we want to keep it around after changing the default so user can later
// switch back to it. This is a hack but it is meant to cover a corner case where a user wants to migrate from a non-revisioned
// old version and then later decides to switch back to the old revision again.
func DeactivateIstioInjectionWebhook(ctx context.Context, client kubernetes.Interface) error {

namespace "istio.io/rev=prod". The "prod" revision tag could point to "1-7-6" initially and then be changed to point to "1-8-1"
at some later point.

This allows operators to change which Istio control plane revision should handle injection for a namespace or set of namespaces
without manual relabeling of the "istio.io/rev" tag.
`,

  - MPL-2.0-no-copyleft-exception
  - Ruby

restricted_licenses:
  - GPL-1.0-only
  - GPL-1.0-or-later
  - GPL-2.0-only
  - GPL-2.0-or-later
  - GPL-3.0-only
  - GPL-3.0-or-later
  - LGPL-2.0-only
  - LGPL-2.0-or-later
  - LGPL-2.1-only
  - LGPL-2.1-or-later
  - LGPL-3.0-only
  - LGPL-3.0-or-later
  - NPL-1.0
  - NPL-1.1
  - OSL-1.0
  - OSL-1.1
  - OSL-2.0
  - OSL-2.1
  - OSL-3.0
  - QPL-1.0

* All traffic *ingressing* a pod on port 15008 in the mesh is assumed to be HBONE, and should be redirected to the node-local ztunnel on port 15008 (more on this later).
* All other traffic *ingressing* a pod in the mesh should be redirected to the node-local ztunnel on port 15006, regardless of intended original destination port.

nt/d/1uM1c3zzoehiijh1ZpZuJ1-SzuVVupenv8r5yuCaFshs/edit#heading=h.dwbqvwmg6ud3))

When a ztunnel receives traffic (authenticated or not) from a workload, it will forward that traffic to the Waypoint proxy **after** applying any `TRANSPORT` layer policies (i.e. `Authorization`s). Thus, if the destination workload has at least the equivalent of a `STRICT` `PeerAuthentication`, unauthenticated traffic will be rejected before it reaches the Waypoint proxy. If the effective policy is `PERMISSIVE`...

// - this is because during add specifically, if CNI plugins have not finished executing,
// K8S may get a pod Add event without any IPs in the object, and the pod will later be updated with IPs.
//
// We always need the IPs, but this is fine because this AddPodToMesh can be called from the CNI plugin as well,

	if err != nil {
		return nil, fmt.Errorf("error configuring iptables: %w", err)
	}

	// Create hostprobe rules now, in the host netns
	// Later we will reuse this same configurator inside the pod netns for adding other rules
	iptablesConfigurator.DeleteHostRules()

				runtime.UnlockOSThread()
			}
		}()

		return toRun()
	}

	var wg sync.WaitGroup
	wg.Add(1)

	// Start the callback in a new green thread so that if we later fail
	// to switch the namespace back to the original one, we can safely
	// leave the thread locked to die without a risk of the current thread
	// left lingering with incorrect namespace.
	var innerError error

    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,

1.12. “Secondary License”

      means either the GNU General Public License, Version 2.0, the GNU Lesser
      General Public License, Version 2.1, the GNU Affero General Public
      License, Version 3.0, or any later versions of those licenses.

1.13. “Source Code Form”

      means the form of the work preferred for making modifications.

1.14. “You” (or “Your”)