# Grafana Helm Chart

* Installs the web dashboarding system [Grafana](http://grafana.org/)

## TL;DR;

```console
$ helm install stable/grafana
```

## Installing the Chart

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

```console
$ helm install --name my-release stable/grafana
```

## Uninstalling the Chart

To uninstall/delete the my-release deployment:

```console
$ helm delete my-release
```

The command removes all the Kubernetes components associated with the chart and deletes the release.


## Configuration

| Parameter                                 | Description                                   | Default                                                 |
|-------------------------------------------|-----------------------------------------------|---------------------------------------------------------|
| `replicas`                                | Number of nodes                               | `1`                                                     |
| `deploymentStrategy`                      | Deployment strategy                           | `RollingUpdate`                                         |
| `livenessProbe`                           | Liveness Probe settings                       | `{ "httpGet": { "path": "/api/health", "port": 3000 } "initialDelaySeconds": 60, "timeoutSeconds": 30, "failureThreshold": 10 }` |
| `readinessProbe`                          | Rediness Probe settings                       | `{ "httpGet": { "path": "/api/health", "port": 3000 } }`|
| `securityContext`                         | Deployment securityContext                    | `{"runAsUser": 472, "fsGroup": 472}`                    |
| `priorityClassName`                       | Name of Priority Class to assign pods         | `nil`                                                   |
| `image.repository`                        | Image repository                              | `grafana/grafana`                                       |
| `image.tag`                               | Image tag. (`Must be >= 5.0.0`)               | `6.0.0`                                                 |
| `image.pullPolicy`                        | Image pull policy                             | `IfNotPresent`                                          |
| `service.type`                            | Kubernetes service type                       | `ClusterIP`                                             |
| `service.port`                            | Kubernetes port where service is exposed      | `80`                                                    |
| `service.targetPort`                      | internal service is port                      | `3000`                                                  |
| `service.annotations`                     | Service annotations                           | `{}`                                                    |
| `service.labels`                          | Custom labels                                 | `{}`                                                    |
| `ingress.enabled`                         | Enables Ingress                               | `false`                                                 |
| `ingress.annotations`                     | Ingress annotations                           | `{}`                                                    |
| `ingress.labels`                          | Custom labels                                 | `{}`                                                    |
| `ingress.hosts`                           | Ingress accepted hostnames                    | `[]`                                                    |
| `ingress.tls`                             | Ingress TLS configuration                     | `[]`                                                    |
| `resources`                               | CPU/Memory resource requests/limits           | `{}`                                                    |
| `nodeSelector`                            | Node labels for pod assignment                | `{}`                                                    |
| `tolerations`                             | Toleration labels for pod assignment          | `[]`                                                    |
| `affinity`                                | Affinity settings for pod assignment          | `{}`                                                    |
| `extraContainers`                         | Sidecar containers to add to the grafana pod  | `{}` |
| `persistence.enabled`                     | Use persistent volume to store data           | `false`                                                 |
| `persistence.initChownData`               | Change ownership of persistent volume on initialization | `true`                                                  |
| `persistence.size`                        | Size of persistent volume claim               | `10Gi`                                                  |
| `persistence.existingClaim`               | Use an existing PVC to persist data           | `nil`                                                   |
| `persistence.storageClassName`            | Type of persistent volume claim               | `nil`                                                   |
| `persistence.accessModes`                 | Persistence access modes                      | `[ReadWriteOnce]`                                       |
| `persistence.subPath`                     | Mount a sub dir of the persistent volume      | `nil`                                                   |
| `schedulerName`                           | Alternate scheduler name                      | `nil`                                                   |
| `env`                                     | Extra environment variables passed to pods    | `{}`                                                    |
| `envFromSecret`                           | Name of a Kubenretes secret (must be manually created in the same namespace) containing values to be added to the environment | `""` |
| `extraSecretMounts`                       | Additional grafana server secret mounts       | `[]`                                                    |
| `extraVolumeMounts`                       | Additional grafana server volume mounts       | `[]`                                                    |
| `extraConfigmapMounts`                    | Additional grafana server configMap volume mounts  | `[]`                                               |
| `plugins`                                 | Plugins to be loaded along with Grafana       | `[]`                                                    |
| `datasources`                             | Configure grafana datasources (passed through tpl) | `{}`                                                    |
| `dashboardProviders`                      | Configure grafana dashboard providers         | `{}`                                                    |
| `dashboards`                              | Dashboards to import                          | `{}`                                                    |
| `dashboardsConfigMaps`                    | ConfigMaps reference that contains dashboards | `{}`                                                    |
| `grafana.ini`                             | Grafana's primary configuration               | `{}`                                                    |
| `ldap.existingSecret`                     | The name of an existing secret containing the `ldap.toml` file, this must have the key `ldap-toml`. | `""` |
| `ldap.config  `                           | Grafana's LDAP configuration                  | `""`                                                    |
| `annotations`                             | Deployment annotations                        | `{}`                                                    |
| `podAnnotations`                          | Pod annotations                               | `{}`                                                    |
| `sidecar.image`              | Sidecar image | `kiwigrid/k8s-sidecar:0.0.11`       |
| `sidecar.imagePullPolicy`              | Sidecar image pull policy | `IfNotPresent`       |
| `sidecar.resources`              | Sidecar resources | `{}`       |
| `sidecar.dashboards.enabled`              | Enabled the cluster wide search for dashboards and adds/updates/deletes them in grafana | `false`       |
| `sidecar.dashboards.label`                | Label that config maps with dashboards should have to be added | `grafana_dashboard`                                |
| `sidecar.dashboards.searchNamespace`      | If specified, the sidecar will search for dashboard config-maps inside this namespace. Otherwise the namespace in which the sidecar is running will be used. It's also possible to specify ALL to search in all namespaces | `nil`                                |
| `sidecar.datasources.enabled`             | Enabled the cluster wide search for datasources and adds/updates/deletes them in grafana |`false`       |
| `sidecar.datasources.label`               | Label that config maps with datasources should have to be added | `grafana_datasource`                               |
| `sidecar.datasources.searchNamespace`     | If specified, the sidecar will search for datasources config-maps inside this namespace. Otherwise the namespace in which the sidecar is running will be used. It's also possible to specify ALL to search in all namespaces | `nil`                               |
| `smtp.existingSecret`                     | The name of an existing secret containing the SMTP credentials. | `""`                                  |
| `smtp.userKey`                            | The key in the existing SMTP secret containing the username. | `"user"`                                 |
| `smtp.passwordKey`                        | The key in the existing SMTP secret containing the password. | `"password"`                             |
| `admin.existingSecret`                    | The name of an existing secret containing the admin credentials. | `""`                                 |
| `admin.userKey`                           | The key in the existing admin secret containing the username. | `"admin-user"`                          |
| `admin.passwordKey`                       | The key in the existing admin secret containing the password. | `"admin-password"`                      |
| `rbac.create`                             | Create and use RBAC resources | `true` |
| `rbac.namespaced`                         | Creates Role and Rolebinding instead of the default ClusterRole and ClusteRoleBindings for the grafana instance  | `false` |
| `rbac.pspEnabled`                         | Create PodSecurityPolicy (with `rbac.create`, grant roles permissions as well) | `true` |
| `rbac.pspUseAppArmor`                     | Enforce AppArmor in created PodSecurityPolicy (requires `rbac.pspEnabled`)  | `true` |

### Example of extraVolumeMounts

```yaml
- extraVolumeMounts:
  - name: plugins
    mountPath: /var/lib/grafana/plugins
    subPath: configs/grafana/plugins
    existingClaim: existing-grafana-claim
    readOnly: false
```

## Import dashboards

There are a few methods to import dashboards to Grafana. Below are some examples and explanations as to how to use each method:

```yaml
dashboards:
  default:
    some-dashboard:
      json: |
        {
          "annotations":

          ...
          # Complete json file here
          ...

          "title": "Some Dashboard",
          "uid": "abcd1234",
          "version": 1
        }
    custom-dashboard:
      # This is a path to a file inside the dashboards directory inside the chart directory
      file: dashboards/custom-dashboard.json
    prometheus-stats:
      # Ref: https://grafana.com/dashboards/2
      gnetId: 2
      revision: 2
      datasource: Prometheus
    local-dashboard:
      url: https://raw.githubusercontent.com/user/repository/master/dashboards/dashboard.json
```

## BASE64 dashboards

Dashboards could be storaged in a server that does not return JSON directly and instead of it returns a Base64 encoded file (e.g. Gerrit)
A new parameter has been added to the url use case so if you specify a b64content value equals to true after the url entry a Base64 decoding is applied before save the file to disk.
If this entry is not set or is equals to false not decoding is applied to the file before saving it to disk.

### Gerrit use case:
Gerrit API for download files has the following schema: https://yourgerritserver/a/{project-name}/branches/{branch-id}/files/{file-id}/content where {project-name} and
{file-id} usualy has '/' in their values and so they MUST be replaced by %2F so if project-name is user/repo, branch-id is master and file-id is equals to dir1/dir2/dashboard
the url value is https://yourgerritserver/a/user%2Frepo/branches/master/files/dir1%2Fdir2%2Fdashboard/content

## Sidecar for dashboards

If the parameter `sidecar.dashboards.enabled` is set, a sidecar container is deployed in the grafana pod. This container watches all config maps in the cluster and filters out the ones with a label as defined in `sidecar.dashboards.label`. The files defined in those configmaps are written to a folder and accessed by grafana. Changes to the configmaps are monitored and the imported dashboards are deleted/updated. A recommendation is to use one configmap per dashboard, as an reduction of multiple dashboards inside one configmap is currently not properly mirrored in grafana.
Example dashboard config:
```
apiVersion: v1
kind: ConfigMap
metadata:
  name: sample-grafana-dashboard
  labels:
     grafana_dashboard: 1
data:
  k8s-dashboard.json: |-
  [...]
```

## Sidecar for datasources

If the parameter `sidecar.datasources.enabled` is set, an init container is deployed in the grafana pod. This container lists all config maps in the cluster and filters out the ones with a label as defined in `sidecar.datasources.label`. The files defined in those configmaps are written to a folder and accessed by grafana on startup. Using these yaml files, the data sources in grafana can be imported. The configmaps must be created before `helm install` so that the datasources init container can list the configmaps.

Example datasource config adapted from [Grafana](http://docs.grafana.org/administration/provisioning/#example-datasource-config-file):
```
apiVersion: v1
kind: ConfigMap
metadata:
  name: sample-grafana-datasource
  labels:
     grafana_datasource: 1
data:
  datasource.yaml: |-
    # config file version
    apiVersion: 1

    # list of datasources that should be deleted from the database
    deleteDatasources:
      - name: Graphite
        orgId: 1

    # list of datasources to insert/update depending
    # whats available in the database
    datasources:
      # <string, required> name of the datasource. Required
    - name: Graphite
      # <string, required> datasource type. Required
      type: graphite
      # <string, required> access mode. proxy or direct (Server or Browser in the UI). Required
      access: proxy
      # <int> org id. will default to orgId 1 if not specified
      orgId: 1
      # <string> url
      url: http://localhost:8080
      # <string> database password, if used
      password:
      # <string> database user, if used
      user:
      # <string> database name, if used
      database:
      # <bool> enable/disable basic auth
      basicAuth:
      # <string> basic auth username
      basicAuthUser:
      # <string> basic auth password
      basicAuthPassword:
      # <bool> enable/disable with credentials headers
      withCredentials:
      # <bool> mark as default datasource. Max one per org
      isDefault:
      # <map> fields that will be converted to json and stored in json_data
      jsonData:
         graphiteVersion: "1.1"
         tlsAuth: true
         tlsAuthWithCACert: true
      # <string> json object of data that will be encrypted.
      secureJsonData:
        tlsCACert: "..."
        tlsClientCert: "..."
        tlsClientKey: "..."
      version: 1
      # <bool> allow users to edit datasources from the UI.
      editable: false

```
