> For the complete documentation index, see [llms.txt](https://docs.openg2p.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.openg2p.org/1.3/deployment/base-infrastructure/openg2p-cluster/cluster-setup/istio.md).

# Istio

Istio is a power traffic mesh management tool. It also provides an ingress gateway for the Kubernetes cluster.

## Installation

### Operator Setup

* The following setup can be done from the client machine. This installs Istio Operator, Istio Service Mesh, Istio Ingressgateway components.
* From [kubernetes/istio](https://github.com/OpenG2P/openg2p-deployment/tree/main/kubernetes/istio) directory, run;

  ```bash
  istioctl operator init
  kubectl apply -f istio-operator.yaml
  ```

  * Wait for `istiod` and `ingressgateway` pods to start.
* Or, for Rancher cluster, run:

  ```bash
  kubectl apply -f istio-ef-spdy-upgrade.yaml
  ```

### Namespace Setup

(Skip this section for Rancher cluster)

Set up an Istio gateway on each namespace for a domain. This assumes that the namespace (and relevant Rancher project) are already created (you may use the Rancher console to create a namespace or via command line `kubectl`)

* Edit and run this to define the variables:

  ```
  export NS=dev
  export WILDCARD_HOSTNAME='*.dev.your.org'
  ```
* From [kubernetes/istio](https://github.com/OpenG2P/openg2p-deployment/tree/main/kubernetes/istio) directory, run the following:

  ```bash
  envsubst < istio-gateway.yaml | kubectl apply -f -
  ```


---

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