github.com/projectcontour/contour@v1.28.2/site/content/docs/1.27/deploy-options.md

# Deployment Options

The [Getting Started][8] guide shows you a simple way to get started with Contour on your cluster.
This topic explains the details and shows you additional options.
Most of this covers running Contour using a Kubernetes Service of `Type: LoadBalancer`.
If you don't have a cluster with that capability see the [Running without a Kubernetes LoadBalancer][1] section.

## Installation

Contour requires a secret containing TLS certificates that are used to secure the gRPC communication between Contour<>Envoy.
This secret can be auto-generated by the Contour `certgen` job or provided by an administrator.
Traffic must be forwarded to Envoy, typically via a Service of `type: LoadBalancer`.
All other requirements such as RBAC permissions, configuration details, are provided or have good defaults for most installations.

### Setting resource requests and limits

It is recommended that resource requests and limits be set on all Contour and Envoy containers.
The example YAML manifests used in the [Getting Started][8] guide do not include these, because the appropriate values can vary widely from user to user.
The table below summarizes the Contour and Envoy containers, and provides some reasonable resource requests to start with (note that these should be adjusted based on observed usage and expected load):

| Workload            | Container        | Request (mem) | Request (cpu) |
| ------------------- | ---------------- | ------------- | ------------- |
| deployment/contour  | contour          | 128Mi         | 250m          |
| daemonset/envoy     | envoy            | 256Mi         | 500m          |
| daemonset/envoy     | shutdown-manager | 50Mi          | 25m           |


### Envoy as Daemonset

The recommended installation is for Contour to run as a Deployment and Envoy to run as a Daemonset.
The example Damonset places a single instance of Envoy per node in the cluster as well as attaches to `hostPorts` on each node.
This model allows for simple scaling of Envoy instances as well as ensuring even distribution of instances across the cluster.

The [example daemonset manifest][2] or [Contour Gateway Provisioner][12] will create an installation based on these recommendations.

_Note: If the size of the cluster is scaled down, connections can be lost since Kubernetes Damonsets do not follow proper `preStop` hooks._

### Envoy as Deployment

An alternative Envoy deployment model is utilizing a Kubernetes Deployment with a configured `podAntiAffinity` which attempts to mirror the Daemonset deployment model.
A benefit of this model compared to the Daemonset version is when a node is removed from the cluster, the proper shutdown events are available so connections can be cleanly drained from Envoy before terminating.

The [example deployment manifest][14] will create an installation based on these recommendations.

## Testing your installation

### Get your hostname or IP address

To retrieve the IP address or DNS name assigned to your Contour deployment, run:

```bash
$ kubectl get -n projectcontour service envoy -o wide
```

On AWS, for example, the response looks like:

```
NAME      CLUSTER-IP     EXTERNAL-IP                                                                    PORT(S)        AGE       SELECTOR
contour   10.106.53.14   a47761ccbb9ce11e7b27f023b7e83d33-2036788482.ap-southeast-2.elb.amazonaws.com   80:30274/TCP   3h        app=contour
```

Depending on your cloud provider, the `EXTERNAL-IP` value is an IP address, or, in the case of Amazon AWS, the DNS name of the ELB created for Contour. Keep a record of this value.

Note that if you are running an Elastic Load Balancer (ELB) on AWS, you must add more details to your configuration to get the remote address of your incoming connections.
See the [instructions for enabling the PROXY protocol.][4]

#### Minikube

On Minikube, to get the IP address of the Contour service run:

```bash
$ minikube service -n projectcontour envoy --url
```

The response is always an IP address, for example `http://192.168.99.100:30588`. This is used as CONTOUR_IP in the rest of the documentation.

#### kind

When creating the cluster on Kind, pass a custom configuration to allow Kind to expose port 80/443 to your local host:

```yaml
kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
nodes:
- role: control-plane
- role: worker
  extraPortMappings:
  - containerPort: 80
    hostPort: 80
    listenAddress: "0.0.0.0"  
  - containerPort: 443
    hostPort: 443
    listenAddress: "0.0.0.0"
```

Then run the create cluster command passing the config file as a parameter.
This file is in the `examples/kind` directory:

```bash
$ kind create cluster --config examples/kind/kind-expose-port.yaml
```

Then, your CONTOUR_IP (as used below) will just be `localhost:80`.

_Note: We've created a public DNS record (`local.projectcontour.io`) which is configured to resolve to `127.0.0.1``. This allows you to use a real domain name in your kind cluster._

### Test with Ingress

The Contour repository contains an example deployment of the Kubernetes Up and Running demo application, [kuard][5].
To test your Contour deployment, deploy `kuard` with the following command:

```bash
$ kubectl apply -f https://projectcontour.io/examples/kuard.yaml
```

Then monitor the progress of the deployment with:

```bash
$ kubectl get po,svc,ing -l app=kuard
```

You should see something like:

```
NAME                       READY     STATUS    RESTARTS   AGE
po/kuard-370091993-ps2gf   1/1       Running   0          4m
po/kuard-370091993-r63cm   1/1       Running   0          4m
po/kuard-370091993-t4dqk   1/1       Running   0          4m

NAME        CLUSTER-IP      EXTERNAL-IP   PORT(S)   AGE
svc/kuard   10.110.67.121   <none>        80/TCP    4m

NAME        HOSTS     ADDRESS     PORTS     AGE
ing/kuard   *         10.0.0.47   80        4m
```

... showing that there are three Pods, one Service, and one Ingress that is bound to all virtual hosts (`*`).

In your browser, navigate your browser to the IP or DNS address of the Contour Service to interact with the demo application.

### Test with HTTPProxy

To test your Contour deployment with [HTTPProxy][9], run the following command:

```sh
$ kubectl apply -f https://projectcontour.io/examples/kuard-httpproxy.yaml
```

Then monitor the progress of the deployment with:

```sh
$ kubectl get po,svc,httpproxy -l app=kuard
```

You should see something like:

```sh
NAME                        READY     STATUS    RESTARTS   AGE
pod/kuard-bcc7bf7df-9hj8d   1/1       Running   0          1h
pod/kuard-bcc7bf7df-bkbr5   1/1       Running   0          1h
pod/kuard-bcc7bf7df-vkbtl   1/1       Running   0          1h

NAME            TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)   AGE
service/kuard   ClusterIP   10.102.239.168   <none>        80/TCP    1h

NAME                                    FQDN                TLS SECRET                  FIRST ROUTE  STATUS  STATUS DESCRIPT
httpproxy.projectcontour.io/kuard      kuard.local         <SECRET NAME IF TLS USED>                valid   valid HTTPProxy
```

... showing that there are three Pods, one Service, and one HTTPProxy .

In your terminal, use curl with the IP or DNS address of the Contour Service to send a request to the demo application:

```sh
$ curl -H 'Host: kuard.local' ${CONTOUR_IP}
```

## Running without a Kubernetes LoadBalancer

If you can't or don't want to use a Service of `type: LoadBalancer` there are other ways to run Contour.

### NodePort Service

If your cluster doesn't have the capability to configure a Kubernetes LoadBalancer,
or if you want to configure the load balancer outside Kubernetes,
you can change the Envoy Service in the [`02-service-envoy.yaml`][7] file and set `type` to `NodePort`.

This will have every node in your cluster listen on the resultant port and forward traffic to Contour.
That port can be discovered by taking the second number listed in the `PORT` column when listing the service, for example `30274` in `80:30274/TCP`.

Now you can point your browser at the specified port on any node in your cluster to communicate with Contour.

### Host Networking

You can run Contour without a Kubernetes Service at all.
This is done by having the Envoy pod run with host networking.
Contour's examples utilize this model in the `/examples` directory.
To configure, set: `hostNetwork: true` and `dnsPolicy: ClusterFirstWithHostNet` on your Envoy pod definition.
Next, pass `--envoy-service-http-port=80 --envoy-service-https-port=443` to the contour `serve` command which instructs Envoy to listen directly on port 80/443 on each host that it is running.
This is best paired with a DaemonSet (perhaps paired with Node affinity) to ensure that a single instance of Contour runs on each Node.
See the [AWS NLB tutorial][10] as an example.

## Disabling Features

You can run Contour with certain features disabled by passing `--disable-feature` flag to the Contour `serve` command.
The flag is used to disable the informer for a custom resource, effectively making the corresponding CRD optional in the cluster.
You can provide the flag multiple times.

For example, to disable ExtensionService CRD, use the flag as follows: `--disable-feature=extensionservices`.

See the [configuration section entry][19] for all options.

## Upgrading Contour/Envoy

At times, it's needed to upgrade Contour, the version of Envoy, or both.
The included `shutdown-manager` can assist with watching Envoy for open connections while draining and give signal back to Kubernetes as to when it's fine to delete Envoy pods during this process.

See the [redeploy envoy][11] docs for more information about how to not drop active connections to Envoy.
Also see the [upgrade guides][15] on steps to roll out a new version of Contour.

## Running Multiple Instances of Contour

It's possible to run multiple instances of Contour within a single Kubernetes cluster.
This can be useful for separating external vs. internal ingress, for having separate ingress controllers for different ingress classes, and more.
Each Contour instance can also be configured via the `--watch-namespaces` flag to handle their own namespaces. This allows the Kubernetes RBAC objects
to be restricted further.

The recommended way to deploy multiple Contour instances is to put each instance in its own namespace.
This avoids most naming conflicts that would otherwise occur, and provides better logical separation between the instances.
However, it is also possible to deploy multiple instances in a single namespace if needed; this approach requires more modifications to the example manifests to function properly.
Each approach is described in detail below, using the [examples/contour][17] directory's manifests for reference.

### In Separate Namespaces (recommended)

In general, this approach requires updating the `namespace` of all resources, as well as giving unique names to cluster-scoped resources to avoid conflicts.

- `00-common.yaml`:
  - update the name of the `Namespace`
  - update the namespace of both `ServiceAccounts`
- `01-contour-config.yaml`: 
  - update the namespace of the `ConfigMap`
  - if you have any namespaced references within the ConfigMap contents (e.g. `fallback-certificate`, `envoy-client-certificate`), ensure those point to the correct namespace as well.
- `01-crds.yaml` will be shared between the two instances; no changes are needed.
- `02-job-certgen.yaml`: 
  - update the namespace of all resources
  - update the namespace of the `ServiceAccount` subject within the `RoleBinding`
- `02-role-contour.yaml`:
  - update the name of the `ClusterRole` to be unique
  - update the namespace of the `Role`
- `02-rbac.yaml`: 
  - update the name of the `ClusterRoleBinding` to be unique
  - update the namespace of the `RoleBinding`
  - update the namespaces of the `ServiceAccount` subject within both resources
  - update the name of the ClusterRole within the ClusterRoleBinding's roleRef to match the unique name used in `02-role-contour.yaml`
- `02-service-contour.yaml`:
  - update the namespace of the `Service`
- `02-service-envoy.yaml`:
  - update the namespace of the `Service`
- `03-contour.yaml`:
  - update the namespace of the `Deployment`
  - add an argument to the container, `--ingress-class-name=<unique ingress class>`, so this instance only processes Ingresses/HTTPProxies with the given ingress class.
- `03-envoy.yaml`:
  - update the namespace of the `DaemonSet`
  - remove the two `hostPort` definitions from the container (otherwise, these would conflict between the two instances)


### In The Same Namespace

This approach requires giving unique names to all resources to avoid conflicts, and updating all resource references to use the correct names.

- `00-common.yaml`:
  - update the names of both `ServiceAccounts` to be unique
- `01-contour-config.yaml`:
  - update the name of the `ConfigMap` to be unique
- `01-crds.yaml` will be shared between the two instances; no changes are needed.
- `02-job-certgen.yaml`:
  - update the names of all resources to be unique
  - update the name of the `Role` within the `RoleBinding`'s roleRef to match the unique name used for the `Role`
  - update the name of the `ServiceAccount` within the `RoleBinding`'s subjects to match the unique name used for the `ServiceAccount`
  - update the serviceAccountName of the `Job`
  - add an argument to the container, `--secrets-name-suffix=<unique suffix>`, so the generated TLS secrets have unique names
  - update the spec.template.metadata.labels on the `Job` to be unique
- `02-role-contour.yaml`:
  - update the names of the `ClusterRole` and `Role` to be unique
- `02-rbac.yaml`:
  - update the names of the `ClusterRoleBinding` and `RoleBinding` to be unique
  - update the roleRefs within both resources to reference the unique `Role` and `ClusterRole` names used in `02-role-contour.yaml`
  - update the subjects within both resources to reference the unique `ServiceAccount` name used in `00-common.yaml`
- `02-service-contour.yaml`:
  - update the name of the `Service` to be unique
  - update the selector to be unique (this must match the labels used in `03-contour.yaml`, below)
- `02-service-envoy.yaml`:
  - update the name of the `Service` to be unique
  - update the selector to be unique (this must match the labels used in `03-envoy.yaml`, below)
- `03-contour.yaml`:
  - update the name of the `Deployment` to be unique
  - update the metadata.labels, the spec.selector.matchLabels, the spec.template.metadata.labels, and the spec.template.spec.affinity.podAntiAffinity labels to match the labels used in `02-service-contour.yaml`
  - update the serviceAccountName to match the unique name used in `00-common.yaml`
  - update the `contourcert` volume to reference the unique `Secret` name generated from `02-certgen.yaml` (e.g. `contourcert<unique-suffix>`)
  - update the `contour-config` volume to reference the unique `ConfigMap` name used in `01-contour-config.yaml`
  - add an argument to the container, `--leader-election-resource-name=<unique lease name>`, so this Contour instance uses a separate leader election `Lease`
  - add an argument to the container, `--envoy-service-name=<unique envoy service name>`, referencing the unique name used in `02-service-envoy.yaml`
  - add an argument to the container, `--ingress-class-name=<unique ingress class>`, so this instance only processes Ingresses/HTTPProxies with the given ingress class.
- `03-envoy.yaml`:
  - update the name of the `DaemonSet` to be unique
  - update the metadata.labels, the spec.selector.matchLabels, and the spec.template.metadata.labels to match the unique labels used in `02-service-envoy.yaml`
  - update the `--xds-address` argument to the initContainer to use the unique name of the contour Service from `02-service-contour.yaml`
  - update the serviceAccountName to match the unique name used in `00-common.yaml`
  - update the `envoycert` volume to reference the unique `Secret` name generated from `02-certgen.yaml` (e.g. `envoycert<unique-suffix>`)
  - remove the two `hostPort` definitions from the container (otherwise, these would conflict between the two instances)

### Using the Gateway provisioner

The Contour Gateway provisioner also supports deploying multiple instances of Contour, either in the same namespace or different namespaces.
See [Getting Started with the Gateway provisioner][16] for more information on getting started with the Gateway provisioner.
To deploy multiple Contour instances, you create multiple `Gateways`, either in the same namespace or in different namespaces.

Note that although the provisioning request itself is made via a Gateway API resource (`Gateway`), this method of installation still allows you to use *any* of the supported APIs for defining virtual hosts and routes: `Ingress`, `HTTPProxy`, or Gateway API's `HTTPRoute` and `TLSRoute`.

If you are using `Ingress` or `HTTPProxy`, you will likely want to assign each Contour instance a different ingress class, so they each handle different subsets of `Ingress`/`HTTPProxy` resources.
To do this, [create two separate GatewayClasses][18], each with a different `ContourDeployment` parametersRef.
The `ContourDeployment` specs should look like:

```yaml
kind: ContourDeployment
apiVersion: projectcontour.io/v1alpha1
metadata:
  namespace: projectcontour
  name: ingress-class-1
spec:
  runtimeSettings:
    ingress:
      classNames:
        - ingress-class-1
---
kind: ContourDeployment
apiVersion: projectcontour.io/v1alpha1
metadata:
  namespace: projectcontour
  name: ingress-class-2
spec:
  runtimeSettings:
    ingress:
      classNames:
        - ingress-class-2
```

Then create each `Gateway` with the appropriate `spec.gatewayClassName`.

## Running Contour in tandem with another ingress controller

If you're running multiple ingress controllers, or running on a cloudprovider that natively handles ingress,
you can specify the annotation `kubernetes.io/ingress.class: "contour"` on all ingresses that you would like Contour to claim.
You can customize the class name with the `--ingress-class-name` flag at runtime. (A comma-separated list of class names is allowed.)
If the `kubernetes.io/ingress.class` annotation is present with a value other than `"contour"`, Contour will ignore that ingress.

## Uninstall Contour

To remove Contour or the Contour Gateway Provisioner from your cluster, delete the namespace:

```bash
$ kubectl delete ns projectcontour
```
**Note**: Your namespace may differ from above.

[1]: #running-without-a-kubernetes-loadbalancer
[2]: {{< param github_url>}}/tree/{{< param branch >}}/examples/render/contour.yaml
[3]: #host-networking
[4]: guides/proxy-proto.md
[5]: https://github.com/kubernetes-up-and-running/kuard
[7]: {{< param github_url>}}/tree/{{< param branch >}}/examples/contour/02-service-envoy.yaml
[8]: /getting-started
[9]: config/fundamentals.md
[10]: guides/deploy-aws-nlb.md
[11]: redeploy-envoy.md
[12]: {{< param github_url>}}/tree/{{< param branch >}}/examples/render/contour-gateway-provisioner.yaml
[13]: https://projectcontour.io/resources/deprecation-policy/
[14]: {{< param github_url>}}/tree/{{< param branch >}}/examples/render/contour-deployment.yaml
[15]: /resources/upgrading/
[16]: https://projectcontour.io/getting-started/#option-3-contour-gateway-provisioner-alpha
[17]: {{< param github_url>}}/tree/{{< param branch >}}/examples/contour
[18]: guides/gateway-api/#next-steps
[19]: configuration.md