# OpenCart

[OpenCart](https://opencart.com/) is a free and open source e-commerce platform for online merchants. It provides a professional and reliable foundation for a successful online store.

## TL;DR

```console
$ helm repo add bitnami https://charts.bitnami.com/bitnami
$ helm install my-release bitnami/opencart
```

## Introduction

This chart bootstraps an [OpenCart](https://github.com/bitnami/bitnami-docker-opencart) deployment on a [Kubernetes](http://kubernetes.io) cluster using the [Helm](https://helm.sh) package manager.

It also packages the [Bitnami MariaDB chart](https://github.com/kubernetes/charts/tree/master/bitnami/mariadb) which is required for bootstrapping a MariaDB deployment for the database requirements of the OpenCart application.

Bitnami charts can be used with [Kubeapps](https://kubeapps.com/) for deployment and management of Helm Charts in clusters. This chart has been tested to work with NGINX Ingress, cert-manager, fluentd and Prometheus on top of the [BKPR](https://kubeprod.io/).

## Prerequisites

- Kubernetes 1.12+
- Helm 2.12+ or Helm 3.0-beta3+
- PV provisioner support in the underlying infrastructure
- ReadWriteMany volumes for deployment scaling

## Installing the Chart

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

```console
$ helm install my-release bitnami/opencart
```

The command deploys OpenCart on the Kubernetes cluster in the default configuration. The [Parameters](#parameters) section lists the parameters that can be configured during installation.

> **Tip**: List all releases using `helm list`

## 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.

## Parameters

The following table lists the configurable parameters of the OpenCart chart and their default values per section/component:

### Global parameters

| Parameter                 | Description                                     | Default                                                 |
|---------------------------|-------------------------------------------------|---------------------------------------------------------|
| `global.imageRegistry`    | Global Docker image registry                    | `nil`                                                   |
| `global.imagePullSecrets` | Global Docker registry secret names as an array | `[]` (does not add image pull secrets to deployed pods) |
| `global.storageClass`     | Global storage class for dynamic provisioning   | `nil`                                                   |

### Common parameters

| Parameter           | Description                                                                  | Default                                                 |
|---------------------|------------------------------------------------------------------------------|---------------------------------------------------------|
| `image.registry`    | OpenCart image registry                                                      | `docker.io`                                             |
| `image.repository`  | OpenCart Image name                                                          | `bitnami/opencart`                                      |
| `image.tag`         | OpenCart Image tag                                                           | `{TAG_NAME}`                                            |
| `image.pullPolicy`  | OpenCart image pull policy                                                   | `IfNotPresent`                                          |
| `image.pullSecrets` | Specify docker-registry secret names as an array                             | `[]` (does not add image pull secrets to deployed pods) |
| `image.debug`       | Specify if debug logs should be enabled                                      | `false`                                                 |
| `nameOverride`      | String to partially override opencart.fullname template                      | `nil`                                                   |
| `fullnameOverride`  | String to fully override opencart.fullname template                          | `nil`                                                   |
| `commonLabels`      | Labels to add to all deployed objects                                        | `nil`                                                   |
| `commonAnnotations` | Annotations to add to all deployed objects                                   | `[]`                                                    |
| `extraDeploy`       | Array of extra objects to deploy with the release (evaluated as a template). | `nil`                                                   |

### OpenCart parameters

| Parameter                            | Description                                                                                                           | Default                                        |
|--------------------------------------|-----------------------------------------------------------------------------------------------------------------------|------------------------------------------------|
| `affinity`                           | Map of node/pod affinities                                                                                            | `{}`                                           |
| `allowEmptyPassword`                 | Allow DB blank passwords                                                                                              | `yes`                                          |
| `args`                               | Override default container args (useful when using custom images)                                                     | `nil`                                          |
| `command`                            | Override default container command (useful when using custom images)                                                  | `nil`                                          |
| `containerPorts.http`                | Sets http port inside NGINX container                                                                                 | `8080`                                         |
| `containerPorts.https`               | Sets https port inside NGINX container                                                                                | `8443`                                         |
| `containerSecurityContext.enabled`   | Enable OpenCart containers' Security Context                                                                          | `true`                                         |
| `containerSecurityContext.runAsUser` | OpenCart containers' Security Context                                                                                 | `1001`                                         |
| `customLivenessProbe`                | Override default liveness probe                                                                                       | `nil`                                          |
| `customReadinessProbe`               | Override default readiness probe                                                                                      | `nil`                                          |
| `existingSecret`                     | Name of a secret with the application password                                                                        | `nil`                                          |
| `extraEnvVarsCM`                     | ConfigMap containing extra env vars                                                                                   | `nil`                                          |
| `extraEnvVarsSecret`                 | Secret containing extra env vars (in case of sensitive data)                                                          | `nil`                                          |
| `extraEnvVars`                       | Extra environment variables                                                                                           | `nil`                                          |
| `extraVolumeMounts`                  | Array of extra volume mounts to be added to the container (evaluated as template). Normally used with `extraVolumes`. | `nil`                                          |
| `extraVolumes`                       | Array of extra volumes to be added to the deployment (evaluated as template). Requires setting `extraVolumeMounts`    | `nil`                                          |
| `initContainers`                     | Add additional init containers to the pod (evaluated as a template)                                                   | `nil`                                          |
| `lifecycleHooks`                     | LifecycleHook to set additional configuration at startup Evaluated as a template                                      | ``                                             |
| `livenessProbe`                      | Liveness probe configuration                                                                                          | `Check values.yaml file`                       |
| `nodeAffinityPreset.type`            | Node affinity preset type. Ignored if `affinity` is set. Allowed values: `soft` or `hard`                             | `""`                                           |
| `nodeAffinityPreset.key`             | Node label key to match Ignored if `affinity` is set.                                                                 | `""`                                           |
| `nodeAffinityPreset.values`          | Node label values to match. Ignored if `affinity` is set.                                                             | `[]`                                           |
| `opencartHost`                       | OpenCart host to create application URLs (when ingress, it will be ignored)                                           | `nil`                                          |
| `opencartUsername`                   | User of the application                                                                                               | `user`                                         |
| `opencartPassword`                   | Application password                                                                                                  | _random 10 character long alphanumeric string_ |
| `opencartEmail`                      | Admin email                                                                                                           | `user@example.com`                             |
| `opencartSkipInstall`                | Skip OpenCart installation wizard                                                                                     | false                                          |
| `nodeSelector`                       | Node labels for pod assignment                                                                                        | `{}` (The value is evaluated as a template)    |
| `persistence.accessMode`             | PVC Access Mode for OpenCart volume                                                                                   | `ReadWriteOnce`                                |
| `persistence.enabled`                | Enable persistence using PVC                                                                                          | `true`                                         |
| `persistence.existingClaim`          | An Existing PVC name                                                                                                  | `nil`                                          |
| `persistence.hostPath`               | Host mount path for OpenCart volume                                                                                   | `nil` (will not mount to a host path)          |
| `persistence.size`                   | PVC Storage Request for OpenCart volume                                                                               | `8Gi`                                          |
| `persistence.storageClass`           | PVC Storage Class for OpenCart volume                                                                                 | `nil` (uses alpha storage class annotation)    |
| `podAffinityPreset`                  | Pod affinity preset. Ignored if `affinity` is set. Allowed values: `soft` or `hard`                                   | `""`                                           |
| `podAntiAffinityPreset`              | Pod anti-affinity preset. Ignored if `affinity` is set. Allowed values: `soft` or `hard`                              | `soft`                                         |
| `podAnnotations`                     | Pod annotations                                                                                                       | `{}`                                           |
| `podLabels`                          | Add additional labels to the pod (evaluated as a template)                                                            | `nil`                                          |
| `podSecurityContext.enabled`         | Enable OpenCart pods' Security Context                                                                                | `true`                                         |
| `podSecurityContext.fsGroup`         | OpenCart pods' group ID                                                                                               | `1001`                                         |
| `readinessProbe`                     | Readiness probe configuration                                                                                         | `Check values.yaml file`                       |
| `replicaCount`                       | Number of OpenCart Pods to run                                                                                        | `1`                                            |
| `resources`                          | CPU/Memory resource requests/limits                                                                                   | Memory: `512Mi`, CPU: `300m`                   |
| `sidecars`                           | Attach additional containers to the pod (evaluated as a template)                                                     | `nil`                                          |
| `smtpHost`                           | SMTP host                                                                                                             | `nil`                                          |
| `smtpPort`                           | SMTP port                                                                                                             | `nil` (but opencart internal default is 25)    |
| `smtpProtocol`                       | SMTP Protocol (options: ssl,tls, nil)                                                                                 | `nil`                                          |
| `smtpUser`                           | SMTP user                                                                                                             | `nil`                                          |
| `smtpPassword`                       | SMTP password                                                                                                         | `nil`                                          |
| `tolerations`                        | Tolerations for pod assignment                                                                                        | `[]` (The value is evaluated as a template)    |
| `updateStrategy`                     | Deployment update strategy                                                                                            | `nil`                                          |

### Traffic Exposure Parameters

| Parameter                        | Description                           | Default            |
|----------------------------------|---------------------------------------|--------------------|
| `service.type`                   | Kubernetes Service type               | `LoadBalancer`     |
| `service.port`                   | Service HTTP port                     | `80`               |
| `service.httpsPort`              | Service HTTPS port                    | `443`              |
| `service.externalTrafficPolicy`  | Enable client source IP preservation  | `Cluster`          |
| `service.nodePorts.http`         | Kubernetes http node port             | `""`               |
| `service.nodePorts.https`        | Kubernetes https node port            | `""`               |
| `ingress.enabled`                | Enable ingress controller resource    | `false`            |
| `ingress.certManager`            | Add annotations for cert-manager      | `false`            |
| `ingress.hostname`               | Default host for the ingress resource | `opencart.local`   |
| `ingress.annotations`            | Ingress annotations                   | `{}`               |
| `ingress.hosts[0].name`          | Hostname to your OpenCart installation  | `nil`            |
| `ingress.hosts[0].path`          | Path within the url structure         | `nil`              |
| `ingress.tls[0].hosts[0]`        | TLS hosts                             | `nil`              |
| `ingress.tls[0].secretName`      | TLS Secret (certificates)             | `nil`              |
| `ingress.secrets[0].name`        | TLS Secret Name                       | `nil`              |
| `ingress.secrets[0].certificate` | TLS Secret Certificate                | `nil`              |
| `ingress.secrets[0].key`         | TLS Secret Key                        | `nil`              |

### Database parameters

| Parameter                                   | Description                                                                              | Default                                        |
|---------------------------------------------|------------------------------------------------------------------------------------------|------------------------------------------------|
| `mariadb.enabled`                           | Whether to use the MariaDB chart                                                         | `true`                                         |
| `mariadb.architecture`                      | MariaDB architecture (`standalone` or `replication`)                                     | `standalone`                                   |
| `mariadb.auth.rootPassword`                 | Password for the MariaDB `root` user                                                     | _random 10 character alphanumeric string_      |
| `mariadb.auth.database`                     | Database name to create                                                                  | `bitnami_opencart`                             |
| `mariadb.auth.username`                     | Database user to create                                                                  | `bn_opencart`                                  |
| `mariadb.auth.password`                     | Password for the database                                                                | _random 10 character long alphanumeric string_ |
| `mariadb.primary.persistence.enabled`       | Enable database persistence using PVC                                                    | `true`                                         |
| `mariadb.primary.persistence.existingClaim` | Name of an existing `PersistentVolumeClaim` for MariaDB primary replicas                 | `nil`                                          |
| `mariadb.primary.persistence.accessModes`   | Database Persistent Volume Access Modes                                                  | `[ReadWriteOnce]`                              |
| `mariadb.primary.persistence.size`          | Database Persistent Volume Size                                                          | `8Gi`                                          |
| `mariadb.primary.persistence.hostPath`      | Set path in case you want to use local host path volumes (not recommended in production) | `nil`                                          |
| `mariadb.primary.persistence.storageClass`  | MariaDB primary persistent volume storage Class                                          | `nil`                                          |
| `externalDatabase.user`                     | Existing username in the external db                                                     | `bn_opencart`                                  |
| `externalDatabase.password`                 | Password for the above username                                                          | `""`                                           |
| `externalDatabase.database`                 | Name of the existing database                                                            | `bitnami_opencart`                             |
| `externalDatabase.host`                     | Host of the existing database                                                            | `nil`                                          |
| `externalDatabase.port`                     | Port of the existing database                                                            | `3306`                                         |

### Volume Permissions parameters

| Parameter                                            | Description                                                                                                                                               | Default                                                      |
|------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------|
| `volumePermissions.enabled`                          | Enable init container that changes volume permissions in the data directory (for cases where the default k8s `runAsUser` and `fsUser` values do not work) | `false`                                                      |
| `volumePermissions.image.registry`                   | Init container volume-permissions image registry                                                                                                          | `docker.io`                                                  |
| `volumePermissions.image.repository`                 | Init container volume-permissions image name                                                                                                              | `bitnami/minideb`                                            |
| `volumePermissions.image.tag`                        | Init container volume-permissions image tag                                                                                                               | `buster`                                                     |
| `volumePermissions.image.pullSecrets`                | Specify docker-registry secret names as an array                                                                                                          | `[]` (does not add image pull secrets to deployed pods)      |
| `volumePermissions.image.pullPolicy`                 | Init container volume-permissions image pull policy                                                                                                       | `Always`                                                     |
| `volumePermissions.resources`                        | Init container resource requests/limit                                                                                                                    | `nil`                                                        |

### Metrics parameters

| Parameter                   | Description                                      | Default                                                      |
|-----------------------------|--------------------------------------------------|--------------------------------------------------------------|
| `metrics.enabled`           | Start a side-car prometheus exporter             | `false`                                                      |
| `metrics.image.registry`    | Apache exporter image registry                   | `docker.io`                                                  |
| `metrics.image.repository`  | Apache exporter image name                       | `bitnami/apache-exporter`                                    |
| `metrics.image.tag`         | Apache exporter image tag                        | `{TAG_NAME}`                                                 |
| `metrics.image.pullPolicy`  | Image pull policy                                | `IfNotPresent`                                               |
| `metrics.image.pullSecrets` | Specify docker-registry secret names as an array | `[]` (does not add image pull secrets to deployed pods)      |
| `metrics.podAnnotations`    | Additional annotations for Metrics exporter pod  | `{prometheus.io/scrape: "true", prometheus.io/port: "9117"}` |
| `metrics.resources`         | Exporter resource requests/limit                 | {}                                                           |

### Certificate injection parameters

| Parameter                                            | Description                                                                                                                                               | Default                                                      |
|------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------|
| `certificates.customCertificate.certificateSecret`   | Secret containing the certificate and key to add                                                                                                          | `""`                                                         |
| `certificates.customCertificate.chainSecret.name`    | Name of the secret containing the certificate chain                                                                                                       | `""`                                                         |
| `certificates.customCertificate.chainSecret.key`     | Key of the certificate chain file inside the secret                                                                                                       | `""`                                                         |
| `certificates.customCertificate.certificateLocation` | Location in the container to store the certificate                                                                                                        | `/etc/ssl/certs/ssl-cert-snakeoil.pem`                       |
| `certificates.customCertificate.keyLocation`         | Location in the container to store the private key                                                                                                        | `/etc/ssl/private/ssl-cert-snakeoil.key`                     |
| `certificates.customCertificate.chainLocation`       | Location in the container to store the certificate chain                                                                                                  | `/etc/ssl/certs/chain.pem`                                   |
| `certificates.customCAs`                             | Defines a list of secrets to import into the container trust store                                                                                        | `[]`                                                         |
| `certificates.image.registry`                        | Container sidecar registry                                                                                                                                | `docker.io`                                                  |
| `certificates.image.repository`                      | Container sidecar image                                                                                                                                   | `bitnami/minideb`                                            |
| `certificates.image.tag`                             | Container sidecar image tag                                                                                                                               | `buster`                                                     |
| `certificates.image.pullPolicy`                      | Container sidecar image pull policy                                                                                                                       | `IfNotPresent`                                               |
| `certificates.image.pullSecrets`                     | Container sidecar image pull secrets                                                                                                                      | `image.pullSecrets`                                          |
| `certificates.args`                                  | Override default container args (useful when using custom images)                                                                                         | `nil`                                                        |
| `certificates.command`                               | Override default container command (useful when using custom images)                                                                                      | `nil`                                                        |
| `certificates.extraEnvVars`                          | Container sidecar extra environment variables (eg proxy)                                                                                                  | `[]`                                                         |
| `certificates.extraEnvVarsCM`                        | ConfigMap containing extra env vars                                                                                                                       | `nil`                                                        |
| `certificates.extraEnvVarsSecret`                    | Secret containing extra env vars (in case of sensitive data)                                                                                              | `nil`                                                        |

The above parameters map to the env variables defined in [bitnami/opencart](http://github.com/bitnami/bitnami-docker-opencart). For more information please refer to the [bitnami/opencart](http://github.com/bitnami/bitnami-docker-opencart) image documentation.

> **Note**:
>
> For OpenCart to function correctly, you should specify the `opencartHost` parameter to specify the FQDN (recommended) or the public IP address of the OpenCart service.
>
> Optionally, you can specify the `opencartLoadBalancerIP` parameter to assign a reserved IP address to the OpenCart service of the chart. However please note that this feature is only available on a few cloud providers (f.e. GKE).
>
> To reserve a public IP address on GKE:
>
> ```bash
> $ gcloud compute addresses create opencart-public-ip
> ```
>
> The reserved IP address can be associated to the OpenCart service by specifying it as the value of the `opencartLoadBalancerIP` parameter while installing the chart.

Specify each parameter using the `--set key=value[,key=value]` argument to `helm install`. For example,

```console
$ helm install my-release \
  --set opencartUsername=admin,opencartPassword=password,mariadb.auth.rootPassword=secretpassword \
    bitnami/opencart
```

The above command sets the OpenCart administrator account username and password to `admin` and `password` respectively. Additionally, it sets the MariaDB `root` user password to `secretpassword`.

Alternatively, a YAML file that specifies the values for the above parameters can be provided while installing the chart. For example,

```console
$ helm install my-release -f values.yaml bitnami/opencart
```

> **Tip**: You can use the default [values.yaml](values.yaml)

## Configuration and installation details

### [Rolling VS Immutable tags](https://docs.bitnami.com/containers/how-to/understand-rolling-tags-containers/)

It is strongly recommended to use immutable tags in a production environment. This ensures your deployment does not change automatically if the same tag is updated with a different image.

Bitnami will release a new chart updating its containers if a new version of the main container, significant changes, or critical vulnerabilities exist.

### Image

The `image` parameter allows specifying which image will be pulled for the chart.

#### Private registry

If you configure the `image` value to one in a private registry, you will need to [specify an image pull secret](https://kubernetes.io/docs/concepts/containers/images/#specifying-imagepullsecrets-on-a-pod).

1. Manually create image pull secret(s) in the namespace. See [this YAML example reference](https://kubernetes.io/docs/concepts/containers/images/#creating-a-secret-with-a-docker-config). Consult your image registry's documentation about getting the appropriate secret.
1. Note that the `imagePullSecrets` configuration value cannot currently be passed to helm using the `--set` parameter, so you must supply these using a `values.yaml` file, such as:

```yaml
imagePullSecrets:
  - name: SECRET_NAME
```

1. Install the chart

### Setting Pod's affinity

This chart allows you to set your custom affinity using the `affinity` paremeter. Find more infomation about Pod's affinity in the [kubernetes documentation](https://kubernetes.io/docs/concepts/configuration/assign-pod-node/#affinity-and-anti-affinity).

As an alternative, you can use of the preset configurations for pod affinity, pod anti-affinity, and node affinity available at the [bitnami/common](https://github.com/bitnami/charts/tree/master/bitnami/common#affinities) chart. To do so, set the `podAffinityPreset`, `podAntiAffinityPreset`, or `nodeAffinityPreset` parameters.

## Persistence

The [Bitnami OpenCart](https://github.com/bitnami/bitnami-docker-opencart) image stores the OpenCart data and configurations at the `/bitnami/opencart` path of the container.

Persistent Volume Claims are used to keep the data across deployments. This is known to work in GCE, AWS, and minikube.
See the [Parameters](#parameters) section to configure the PVC or to disable persistence.

### Existing PersistentVolumeClaim

1. Create the PersistentVolume
1. Create the PersistentVolumeClaim
1. Install the chart

```bash
$ helm install my-release --set persistence.existingClaim=PVC_NAME bitnami/prestashop
```

### Host path

#### System compatibility

- The local filesystem accessibility to a container in a pod with `hostPath` has been tested on OSX/MacOS with xhyve, and Linux with VirtualBox.
- Windows has not been tested with the supported VM drivers. Minikube does however officially support [Mounting Host Folders](https://github.com/kubernetes/minikube/blob/master/docs/host_folder_mount.md) per pod. Or you may manually sync your container whenever host files are changed with tools like [docker-sync](https://github.com/EugenMayer/docker-sync) or [docker-bg-sync](https://github.com/cweagans/docker-bg-sync).

#### Mounting steps

1. The specified `hostPath` directory must already exist (create one if it does not).
1. Install the chart

    ```bash
    $ helm install my-release --set persistence.hostPath=/PATH/TO/HOST/MOUNT bitnami/prestashop
    ```

    This will mount the `prestashop-data` volume into the `hostPath` directory. The site data will be persisted if the mount path contains valid data, else the site data will be initialized at first launch.
1. Because the container cannot control the host machine's directory permissions, you must set the PrestaShop file directory permissions yourself and disable or clear PrestaShop cache.

## Upgrading

### To 8.0.0

**Important:** Under no circumstance should you run `helm upgrade` to `8.0.0` or you may suffer unrecoverable data loss of your site's data.

This release includes several breaking changes which are listed below. To upgrade to `8.0.0`, we recommend to install a new OpenCart chart, and migrate your OpenCart site using the application's [Backup & Restore tool](http://docs.opencart.com/en-gb/tools/backup/).

> NOTE: It is highly recommened to create a backup of your database before migrating your site. The steps below would be only valid if your application (e.g. any plugins or custom code) is compatible with MariaDB 10.5.x
Obtain the credentials and the name of the PVC used to hold the MariaDB data on your current release:

```console
export OPENCART_PASSWORD=$(kubectl get secret --namespace default opencart -o jsonpath="{.data.opencart-password}" | base64 --decode)
export MARIADB_ROOT_PASSWORD=$(kubectl get secret --namespace default opencart-mariadb -o jsonpath="{.data.mariadb-root-password}" | base64 --decode)
export MARIADB_PASSWORD=$(kubectl get secret --namespace default opencart-mariadb -o jsonpath="{.data.mariadb-password}" | base64 --decode)
export MARIADB_PVC=$(kubectl get pvc -l app.kubernetes.io/instance=opencart,app.kubernetes.io/name=mariadb,app.kubernetes.io/component=primary -o jsonpath="{.items[0].metadata.name}")
```

#### New volume mount locations

Locations for volume mounts have been changed. Now, OpenCart's persisted volume will contain the following directories:

- `opencart`: Persisted OpenCart files
- `opencart_storage`: OpenCart storage files

These folders will be mounted to the respective sub-paths in `/bitnami`. Before, the entire volume was mounted to `/bitnami/opencart`.

#### Support for non-root user approach

The [Bitnami OpenCart](https://github.com/bitnami/bitnami-docker-opencart) image was updated to support and enable the "non-root" user approach

If you want to continue to run the container image as the `root` user, you need to set `podSecurityContext.enabled=false` and `containerSecurity.context.enabled=false`.

This upgrade also adapts the chart to the latest Bitnami good practices. Check the Parameters section for more information.

#### MariaDB dependency update

MariaDB dependency version was bumped to a new major version that introduces several incompatilibites. Therefore, backwards compatibility is not guaranteed unless an external database is used. Check [MariaDB Upgrading Notes](https://github.com/bitnami/charts/tree/master/bitnami/mariadb#to-800) for more information.

### To 7.0.0

Helm performs a lookup for the object based on its group (apps), version (v1), and kind (Deployment). Also known as its GroupVersionKind, or GVK. Changing the GVK is considered a compatibility breaker from Kubernetes' point of view, so you cannot "upgrade" those objects to the new GVK in-place. Earlier versions of Helm 3 did not perform the lookup correctly which has since been fixed to match the spec.

In https://github.com/helm/charts/pull/17302 the `apiVersion` of the deployment resources was updated to `apps/v1` in tune with the api's deprecated, resulting in compatibility breakage.

This major version signifies this change.

### To 3.0.0

Backwards compatibility is not guaranteed unless you modify the labels used on the chart's deployments.
Use the workaround below to upgrade from versions previous to 3.0.0. The following example assumes that the release name is opencart:

```console
$ kubectl patch deployment opencart-opencart --type=json -p='[{"op": "remove", "path": "/spec/selector/matchLabels/chart"}]'
$ kubectl delete statefulset opencart-mariadb --cascade=false
```
