charts/bitnami/moodle

Moodle

Moodle is a learning platform designed to provide educators, administrators and learners with a single robust, secure and integrated system to create personalized learning environments

TL;DR;

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

Introduction

This chart bootstraps a Moodle 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 for the database requirements of the Moodle 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/moodle

The command deploys Moodle 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 Moodle 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	Moodle image registry	docker.io
image.repository	Moodle Image name	bitnami/moodle
image.tag	Moodle Image tag	{TAG_NAME}
image.pullPolicy	Moodle 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 moodle.fullname template	nil
fullnameOverride	String to fully override moodle.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

Moodle 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 Moodle containers' Security Context	true
containerSecurityContext.runAsUser	Moodle 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
moodleSkipInstall	Skip moodle installation wizard (no / yes)	no
moodleUsername	User of the application	user
moodlePassword	Application password	random 10 character alphanumeric string
moodleEmail	Admin email	user@example.com
nodeSelector	Node labels for pod assignment	{} (The value is evaluated as a template)
persistence.accessMode	PVC Access Mode for Moodle volume	ReadWriteOnce
persistence.enabled	Enable persistence using PVC	true
persistence.existingClaim	An Existing PVC name	nil
persistence.hostPath	Host mount path for Moodle volume	nil (will not mount to a host path)
persistence.size	PVC Storage Request for Moodle volume	8Gi
persistence.storageClass	PVC Storage Class for Moodle 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 Moodle pods' Security Context	true
podSecurityContext.fsGroup	Moodle pods' group ID	1001
readinessProbe	Readiness probe configuration	Check values.yaml file
replicaCount	Number of Moodle 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 moodle 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	moodle.local
ingress.annotations	Ingress annotations	{}
ingress.hosts[0].name	Hostname to your Moodle 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_moodle
mariadb.db.user	Database user to create	bn_moodle
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_moodle
externalDatabase.password	Password for the above username	nil
externalDatabase.database	Name of the existing database	bitnami_moodle
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/moodle. For more information please refer to the bitnami/moodle image documentation.

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

$ helm install my-release \
  --set moodleUsername=admin,moodlePassword=password,mariadb.mariadbRootPassword=secretpassword \
    bitnami/moodle

The above command sets the Moodle 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/moodle

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.

Ingress without TLS

For using ingress (example without TLS):

ingress.enabled=True
ingress.hosts[0]=moodle.domain.com
serviceType=ClusterIP
moodleUsername=admin
moodlePassword=password
mariadb.mariadbRootPassword=secretpassword

These are the 3 mandatory parameters when Ingress is desired: ingress.enabled=True, ingress.hosts[0]=moodle.domain.com and serviceType=ClusterIP

Ingress TLS

If your cluster allows automatic creation/retrieval of TLS certificates (e.g. kube-lego), please refer to the documentation for that mechanism.

To manually configure TLS, first create/retrieve a key & certificate pair for the address(es) you wish to protect. Then create a TLS secret (named moodle-server-tls in this example) in the namespace. Include the secret's name, along with the desired hostnames, in the Ingress TLS section of your custom values.yaml file:

ingress:
  ## If true, Moodle server Ingress will be created
  ##
  enabled: true

  ## Moodle server Ingress annotations
  ##
  annotations: {}
  #   kubernetes.io/ingress.class: nginx
  #   kubernetes.io/tls-acme: 'true'

  ## Moodle server Ingress hostnames
  ## Must be provided if Ingress is enabled
  ##
  hosts:
    - moodle.domain.com

  ## Moodle server Ingress TLS configuration
  ## Secrets must be manually created in the namespace
  ##
  tls:
    - secretName: moodle-server-tls
      hosts:
        - moodle.domain.com

Persistence

The Bitnami Moodle image stores the Moodle data and configurations at the /bitnami/moodle and /bitnami/apache paths of the container.

Persistent Volume Claims are used to keep the data across deployments. This is known to work in GCE, AWS, vpshere, and minikube. See the Parameters section to configure the PVC or to disable persistence. You may want to review the PV reclaim policy and update as required. By default, it's set to delete, and when Moodle is uninstalled, data is also removed.

Upgrading

To 8.0.0

The Bitnami Moodle image was updated to support "non-root" user approach, however, it is not enabled by default. The container still runs as the root user and the Apache daemon is started as the daemon user, due to running Cron as a service, which requires running as root.

If you want to run with a non-root user, you need to set podSecurityContext.enabled=true and containerSecurity.context.enabled=true. In addition to that, you will also need to change the default Apache HTTP ports to run as a non-privileged user by setting containerPorts.http and containerPorts.https to a non-privileged port number (higher than 1024, i.e. 8080 and 8443, respectively). Note that, when running as a non-root user, Cron will not supported and therefore scheduled tasks will not be enabled for Moodle.

This upgrade also adapts the chart to the latest Bitnami good practices. Check the Parameters section 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/17301 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 moodle:

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