# Installation Guide

!!! attention
    The default configuration watches Ingress object from **all namespaces**.

    To change this behavior use the flag `--watch-namespace` to limit the scope to a particular namespace.

!!! warning
    If multiple Ingresses define paths for the same host, the ingress controller **merges the definitions**.

!!! danger
    The [admission webhook](https://kubernetes.io/docs/reference/access-authn-authz/extensible-admission-controllers/) requires connectivity between Kubernetes API server and the ingress controller.

    In case [Network policies](https://kubernetes.io/docs/concepts/services-networking/network-policies/) or additional firewalls, please allow access to port `8443`.

!!! attention
    The first time the ingress controller starts, two [Jobs](https://kubernetes.io/docs/concepts/workloads/controllers/jobs-run-to-completion/) create the SSL Certificate used by the admission webhook.
    For this reason, there is an initial delay of up to two minutes until it is possible to create and validate Ingress definitions.

    You can wait until it is ready to run the next command:

    ```yaml
    kubectl wait --namespace ingress-nginx \
      --for=condition=ready pod \
      --selector=app.kubernetes.io/component=controller \
      --timeout=120s
    ```

## Contents

- [Provider Specific Steps](#provider-specific-steps)
  - [Docker for Mac](#docker-for-mac)
  - [minikube](#minikube)
  - [microk8s](#microk8s)
  - [AWS](#aws)
  - [GCE - GKE](#gce-gke)
  - [Azure](#azure)
  - [Digital Ocean](#digital-ocean)
  - [Scaleway](#scaleway)
  - [Bare-metal](#bare-metal)
  - [Verify installation](#verify-installation)
  - [Detect installed version](#detect-installed-version)
- [Using Helm](#using-helm)

### Provider Specific Steps

#### Docker for Mac

Kubernetes is available in Docker for Mac (from [version 18.06.0-ce](https://docs.docker.com/docker-for-mac/release-notes/#stable-releases-of-2018))

```console
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v0.43.0/deploy/static/provider/cloud/deploy.yaml
```

#### minikube

For standard usage:

```console
minikube addons enable ingress
```

#### microk8s

For standard usage:

```console
microk8s enable ingress
```

Please check the microk8s [documentation page](https://microk8s.io/docs/addon-ingress)

#### AWS

In AWS we use a Network load balancer (NLB) to expose the NGINX Ingress controller behind a Service of `Type=LoadBalancer`.

##### Network Load Balancer (NLB)

```console
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v0.43.0/deploy/static/provider/aws/deploy.yaml
```

##### TLS termination in AWS Load Balancer (ELB)

In some scenarios is required to terminate TLS in the Load Balancer and not in the ingress controller.

For this purpose we provide a template:

- Download [deploy-tls-termination.yaml](https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v0.43.0/deploy/static/provider/aws/deploy-tls-termination.yaml)

```console
wget https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v0.43.0/deploy/static/provider/aws/deploy-tls-termination.yaml
```

- Edit the file and change:

  - VPC CIDR in use for the Kubernetes cluster:

  `proxy-real-ip-cidr: XXX.XXX.XXX/XX`

  - AWS Certificate Manager (ACM) ID

  `arn:aws:acm:us-west-2:XXXXXXXX:certificate/XXXXXX-XXXXXXX-XXXXXXX-XXXXXXXX`

- Deploy the manifest:

```console
kubectl apply -f deploy-tls-termination.yaml
```

##### NLB Idle Timeouts

Idle timeout value for TCP flows is 350 seconds and [cannot be modified](https://docs.aws.amazon.com/elasticloadbalancing/latest/network/network-load-balancers.html#connection-idle-timeout).

For this reason, you need to ensure the [keepalive_timeout](http://nginx.org/en/docs/http/ngx_http_core_module.html#keepalive_timeout) value is configured less than 350 seconds to work as expected.

By default NGINX `keepalive_timeout` is set to `75s`.

More information with regards to timeouts can be found in the [official AWS documentation](https://docs.aws.amazon.com/elasticloadbalancing/latest/network/network-load-balancers.html#connection-idle-timeout)

#### GCE-GKE

!!! info
    Initialize your user as a cluster-admin with the following command:
    ```console
    kubectl create clusterrolebinding cluster-admin-binding \
      --clusterrole cluster-admin \
      --user $(gcloud config get-value account)
    ```

!!! danger
    For private clusters, you will need to either add an additional firewall rule that allows master nodes access to port `8443/tcp` on worker nodes, or change the existing rule that allows access to ports `80/tcp`, `443/tcp` and `10254/tcp` to also allow access to port `8443/tcp`.

    See the [GKE documentation](https://cloud.google.com/kubernetes-engine/docs/how-to/private-clusters#add_firewall_rules) on adding rules and the [Kubernetes issue](https://github.com/kubernetes/kubernetes/issues/79739) for more detail.


```console
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v0.43.0/deploy/static/provider/cloud/deploy.yaml
```

!!! failure Important
    Proxy protocol is not supported in GCE/GKE

#### Azure

```console
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v0.43.0/deploy/static/provider/cloud/deploy.yaml
```

More information with regards to Azure annotations for ingress controller can be found in the [official AKS documentation](https://docs.microsoft.com/en-us/azure/aks/ingress-internal-ip#create-an-ingress-controller).

#### Digital Ocean

```console
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v0.43.0/deploy/static/provider/do/deploy.yaml
```

#### Scaleway

```console
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v0.43.0/deploy/static/provider/scw/deploy.yaml
```

#### Bare-metal

Using [NodePort](https://kubernetes.io/docs/concepts/services-networking/service/#type-nodeport):

```console
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v0.43.0/deploy/static/provider/baremetal/deploy.yaml
```

!!! tip
    Applicable on kubernetes clusters deployed on bare-metal with generic Linux distro(Such as CentOs, Ubuntu ...).

!!! info
    For extended notes regarding deployments on bare-metal, see [Bare-metal considerations](./baremetal.md).

### Verify installation

!!! info
    In minikube the ingress addon is installed in the namespace **kube-system** instead of ingress-nginx

To check if the ingress controller pods have started, run the following command:

```console
kubectl get pods -n ingress-nginx \
  -l app.kubernetes.io/name=ingress-nginx --watch
```

Once the ingress controller pods are running, you can cancel the command typing `Ctrl+C`.

Now, you are ready to create your first ingress.

### Detect installed version

To detect which version of the ingress controller is running, exec into the pod and run `nginx-ingress-controller --version`.

```console
POD_NAMESPACE=ingress-nginx
POD_NAME=$(kubectl get pods -n $POD_NAMESPACE -l app.kubernetes.io/name=ingress-nginx --field-selector=status.phase=Running -o jsonpath='{.items[0].metadata.name}')

kubectl exec -it $POD_NAME -n $POD_NAMESPACE -- /nginx-ingress-controller --version
```

## Using Helm

!!! attention
    Only Helm v3 is supported

NGINX Ingress controller can be installed via [Helm](https://helm.sh/) using the chart from the project repository.
To install the chart with the release name `ingress-nginx`:

```console
helm repo add ingress-nginx https://kubernetes.github.io/ingress-nginx
helm repo update

helm install ingress-nginx ingress-nginx/ingress-nginx
```

## Detect installed version:

```console
POD_NAME=$(kubectl get pods -l app.kubernetes.io/name=ingress-nginx -o jsonpath='{.items[0].metadata.name}')
kubectl exec -it $POD_NAME -- /nginx-ingress-controller --version
```
