charts/bitnami/drupal

Drupal

Drupal is one of the most versatile open source content management systems on the market.

TL;DR;

$ helm repo add bitnami https://charts.bitnami.com/bitnami
$ helm install my-release bitnami/drupal

Introduction

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

It also packages the Bitnami MariaDB chart which is required for bootstrapping a MariaDB deployment as a database for the Drupal application.

Bitnami charts can be used with Kubeapps 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.

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:

$ helm install my-release bitnami/drupal

The command deploys Drupal on the Kubernetes cluster in the default configuration. The 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:

$ 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 Drupal 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	Drupal image registry	docker.io
image.repository	Drupal Image name	bitnami/drupal
image.tag	Drupal Image tag	{TAG_NAME}
image.pullPolicy	Drupal 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 drupal.fullname template	nil
fullnameOverride	String to fully override drupal.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

Drupal 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
containerSecurityContext.enabled	Enable Drupal containers' Security Context	true
containerSecurityContext.runAsUser	Drupal containers' Security Context	1001
customLivenessProbe	Override default liveness probe	nil
customReadinessProbe	Override default readiness probe	nil
drupalEmail	Admin email	user@example.com
drupalPassword	Application password	random 10 character long alphanumeric string
drupalProfile	Drupal installation profile	standard
drupalUsername	User of the application	user
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
nodeSelector	Node labels for pod assignment	{} (The value is evaluated as a template)
persistence.accessMode	PVC Access Mode for Drupal volume	ReadWriteOnce
persistence.enabled	Enable persistence using PVC	true
persistence.existingClaim	An Existing PVC name	nil
persistence.hostPath	Host mount path for Drupal volume	nil (will not mount to a host path)
persistence.size	PVC Storage Request for Drupal volume	8Gi
persistence.storageClass	PVC Storage Class for Drupal volume	nil (uses alpha storage class annotation)
podAnnotations	Pod annotations	{}
podLabels	Add additional labels to the pod (evaluated as a template)	nil
podSecurityContext.enabled	Enable Drupal pods' Security Context	true
podSecurityContext.fsGroup	Drupal pods' group ID	1001
readinessProbe	Readiness probe configuration	Check values.yaml file
replicaCount	Number of Drupal 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
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	drupal.local
ingress.annotations	Ingress annotations	{}
ingress.hosts[0].name	Hostname to your Drupal 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.rootUser.password	MariaDB admin password	nil
mariadb.db.name	Database name to create	bitnami_drupal
mariadb.db.user	Database user to create	bn_drupal
mariadb.db.password	Password for the database	random 10 character long alphanumeric string
mariadb.replication.enabled	MariaDB replication enabled	false
mariadb.master.persistence.enabled	Enable database persistence using PVC	true
mariadb.master.persistence.accessMode	Database Persistent Volume Access Modes	ReadWriteOnce
mariadb.master.persistence.size	Database Persistent Volume Size	8Gi
mariadb.master.persistence.existingClaim	Enable persistence using an existing PVC	nil
mariadb.master.persistence.storageClass	PVC Storage Class	nil (uses alpha storage class annotation)
mariadb.master.persistence.hostPath	Host mount path for MariaDB volume	nil (will not mount to a host path)
externalDatabase.user	Existing username in the external db	bn_drupal
externalDatabase.password	Password for the above username	nil
externalDatabase.database	Name of the existing database	bitnami_drupal
externalDatabase.host	Host of the existing database	nil
externalDatabase.port	Port of the existing database	3306

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	{}

The above parameters map to the env variables defined in bitnami/drupal. For more information please refer to the bitnami/drupal image documentation.

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

$ helm install my-release \
  --set drupalUsername=admin,drupalPassword=password,mariadb.mariadbRootPassword=secretpassword \
    bitnami/drupal

The above command sets the Drupal 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,

$ helm install my-release -f values.yaml bitnami/drupal

Tip

: You can use the default values.yaml

Configuration and installation details

Rolling VS Immutable tags

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.

1. Manually create image pull secret(s) in the namespace. See this YAML example reference. Consult your image registry's documentation about getting the appropriate secret.
2. 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:

imagePullSecrets:
  - name: SECRET_NAME

1. Install the chart

Persistence

The Bitnami Drupal image stores the Drupal data at the /bitnami/drupal 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 section to configure the PVC or to disable persistence.

Existing PersistentVolumeClaim

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

$ helm install my-release --set persistence.existingClaim=PVC_NAME bitnami/drupal

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 per pod. Or you may manually sync your container whenever host files are changed with tools like docker-sync or docker-bg-sync.

Mounting steps

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

2. Install the chart

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

   This will mount the drupal-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.

3. Because the container cannot control the host machine’s directory permissions, you must set the Drupal file directory permissions yourself and disable or clear Drupal cache. See Drupal Core’s INSTALL.txt for setting file permissions, and see Drupal handbook page to disable the cache, or Drush handbook to clear cache.

Upgrading

To 8.0.0

The Bitnami Drupal image was migrated to a "non-root" user approach. Previously the container ran as the root user and the Apache daemon was started as the daemon user. From now on, both the container and the Apache daemon run as user 1001. You can revert this behavior by setting the parameters containerSecurityContext.runAsUser to root.

Consequences:

• The HTTP/HTTPS ports exposed by the container are now 8080/8443 instead of 80/443.
• Backwards compatibility is not guaranteed.

To upgrade to 8.0.0, backup Drupal data and the previous MariaDB databases, install a new Drupal chart and import the backups and data, ensuring the 1001 user has the appropriate permissions on the migrated volume.

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

To 6.0.0

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/17295 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 2.0.0

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 2.0.0. The following example assumes that the release name is drupal:

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