# Introduction

This chart bootstraps an emqx deployment on a Kubernetes cluster using the Helm package manager.

# Prerequisites

+ Kubernetes 1.6+
+ Helm

# Installing the Chart

To install the chart with the release name `my-emqx`:

+ From github
  ```
  $ git clone https://github.com/emqx/emqx.git
  $ cd emqx/deploy/charts/emqx
  $ helm install my-emqx .
  ```

+ From chart repos
  ```
  helm repo add emqx https://repos.emqx.io/charts
  helm install my-emqx emqx/emqx
  ```
  > If you want to install an unstable version, you need to add `--devel` when you execute the `helm install` command.

# Uninstalling the Chart

To uninstall/delete the `my-emqx` deployment:

```
$ helm del  my-emqx
```

# Configuration

The following table lists the configurable parameters of the emqx chart and their default values.

| Parameter | Description | Default Value |
|--------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------|
| `replicaCount` | It is recommended to have odd number of nodes in a cluster, otherwise the emqx cluster cannot be automatically healed in case of net-split. | 3 |
| `image.repository` | EMQX Image name | `emqx/emqx-enterprise` |
| `image.pullPolicy` | The image pull policy | IfNotPresent |
| `image.pullSecrets ` | The image pull secrets | `[]` (does not add image pull secrets to deployed pods) |
| `envFromSecret` | The name pull a secret in the same kubernetes namespace which contains values that will be added to the environment | nil |
| `recreatePods` | Forces the recreation of pods during upgrades, which can be useful to always apply the most recent configuration. | false |
| `podAnnotations ` | Annotations for pod | `{}` |
| `podManagementPolicy` | To redeploy a chart with existing PVC(s), the value must be set to Parallel to avoid deadlock | `Parallel` |
| `persistence.enabled` | Enable EMQX persistence using PVC | false |
| `persistence.storageClass` | Storage class of backing PVC | `nil` (uses alpha storage class annotation) |
| `persistence.existingClaim` | EMQX data Persistent Volume existing claim name, evaluated as a template | "" |
| `persistence.accessMode` | PVC Access Mode for EMQX volume | ReadWriteOnce |
| `persistence.size` | PVC Storage Request for EMQX volume | 20Mi |
| `initContainers` | Containers that run before the creation of EMQX containers. They can contain utilities or setup scripts. | `{}` |
| `resources` | CPU/Memory resource requests/limits | {} |
| `nodeSelector` | Node labels for pod assignment | `{}` |
| `tolerations` | Toleration labels for pod assignment | `[]` |
| `affinity` | Map of node/pod affinities | `{}` |
| `service.type` | Kubernetes Service type. | ClusterIP |
| `service.mqtt` | Port for MQTT. | 1883 |
| `service.mqttssl` | Port for MQTT(SSL). | 8883 |
| `service.ws` | Port for WebSocket/HTTP. | 8083 |
| `service.wss` | Port for WSS/HTTPS. | 8084 |
| `service.dashboard` | Port for dashboard and API. | 18083 |
| `service.nodePorts.mqtt` | Kubernetes node port for MQTT. | nil |
| `service.nodePorts.mqttssl` | Kubernetes node port for MQTT(SSL). | nil |
| `service.nodePorts.mgmt` | Kubernetes node port for mgmt API. | nil |
| `service.nodePorts.ws` | Kubernetes node port for WebSocket/HTTP. | nil |
| `service.nodePorts.wss` | Kubernetes node port for WSS/HTTPS. | nil |
| `service.nodePorts.dashboard` | Kubernetes node port for dashboard. | nil |
| `service.loadBalancerIP` | loadBalancerIP for Service | nil |
| `service.loadBalancerSourceRanges` | Address(es) that are allowed when service is LoadBalancer | [] |
| `service.externalIPs` | ExternalIPs for the service | [] |
`service.externalTrafficPolicy` |	External Traffic Policy for the service |	`Cluster`
| `service.annotations` | Service annotations | {}(evaluated as a template) |
| `ingress.dashboard.enabled` | Enable ingress for EMQX Dashboard | false |
| `ingress.dashboard.ingressClassName` | Set the ingress class for EMQX Dashboard | |
| `ingress.dashboard.path` | Ingress path for EMQX Dashboard | / |
| `ingress.dashboard.pathType` | Ingress pathType for EMQX Dashboard | `ImplementationSpecific` |
| `ingress.dashboard.hosts` | Ingress hosts for EMQX Mgmt API | dashboard.emqx.local |
| `ingress.dashboard.tls` | Ingress tls for EMQX Mgmt API | [] |
| `ingress.dashboard.annotations` | Ingress annotations for EMQX Mgmt API | {} |
| `ingress.mgmt.enabled` | Enable ingress for EMQX Mgmt API | false |
| `ingress.dashboard.ingressClassName` | Set the ingress class for EMQX Mgmt API | |
| `ingress.mgmt.path` | Ingress path for EMQX Mgmt API | / |
| `ingress.mgmt.hosts` | Ingress hosts for EMQX Mgmt API | api.emqx.local |
| `ingress.mgmt.tls` | Ingress tls for EMQX Mgmt API | [] |
| `ingress.mgmt.annotations` | Ingress annotations for EMQX Mgmt API | {} |
| `metrics.enable` | If set to true, [prometheus-operator](https://github.com/prometheus-operator/prometheus-operator) needs to be installed, and emqx_prometheus needs to enable | false |
| `metrics.type` | Now we only supported "prometheus" | "prometheus" |
| `ssl.enabled` | Enable SSL support | false |
| `ssl.useExisting` | Use existing certificate or let cert-manager generate one | false |
| `ssl.existingName` | Name of existing certificate | emqx-tls |
| `ssl.dnsnames` | DNS name(s) for certificate to be generated | {} |
| `ssl.issuer.name` | Issuer name for certificate generation | letsencrypt-dns |
| `ssl.issuer.kind` | Issuer kind for certificate generation | ClusterIssuer |

## EMQX specific settings

The following table lists the configurable [EMQX](https://www.emqx.io/)-specific parameters of the chart and their
default values.
Parameter | Description | Default Value
--- | --- | ---
`emqxConfig` | Map of [configuration](https://www.emqx.io/docs/en/latest/configuration/configuration.html) items
expressed as [environment variables](https://www.emqx.io/docs/en/v4.3/configuration/environment-variable.html) (prefix
can be omitted) or using the configuration
files [namespaced dotted notation](https://www.emqx.io/docs/en/latest/configuration/configuration.html) | `nil`
`emqxLicenseSecretName` | Name of the secret that holds the license information | `nil`

## SSL settings
`cert-manager` generates secrets with certificate data using the keys `tls.crt` and `tls.key`. The helm chart always mounts those keys as files to `/tmp/ssl/`
which needs to explicitly configured by either changing the emqx config file or by passing the following environment variables:

```
  EMQX_LISTENERS__SSL__DEFAULT__SSL_OPTIONS__CERTFILE: /tmp/ssl/tls.crt
  EMQX_LISTENERS__SSL__DEFAULT__SSL_OPTIONS__KEYFILE: /tmp/ssl/tls.key
```

If you chose to use an existing certificate, make sure, you update the filenames accordingly.