wiki/dev/helm

A modern, lightweight and powerful wiki app built on NodeJS

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Introduction

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

It also optionally packages the PostgreSQL as the database but you are free to bring your own.

Prerequisites

• PV provisioner support in the underlying infrastructure (with persistence storage enabled) if you want data persistance

Installing the Chart

To install the chart with the release name my-release run the following from this (helm) directory:

Using Helm 3:

$ helm install my-release .

Using Helm 2:

$ helm install --name my-release . 

The command deploys Wiki.js on the Kubernetes cluster in the default configuration. The configuration 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.

Warning: Persistant Volume Claims for the database are not deleted automatically. They need to be manually deleted

$ kubectl delete pvc/data-wiki-postgresql-0

Configuration

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

Parameter	Description	Default
image.repository	Wiki.js image	requarks/wiki
image.tag	Wiki.js image tag	latest
imagePullPolicy	Image pull policy	IfNotPresent
replicacount	Amount of wiki.js service pods to run	1
resources.limits	wiki.js service resource limits	nil
resources.requests	wiki.js service resource requests	nil
nodeSelector	Node labels for wiki.js pod assignment	{}
affinity	Affinity settings for wiki.js pod assignment	{}
schedulerName	Name of an alternate scheduler for wiki.js pod	nil
tolerations	Toleration labels for wiki.jsk pod assignment	[]
ingress.enabled	Enable ingress controller resource	false
ingress.annotations	Ingress annotations	{}
ingress.hosts	List of ingress rules	[{"host": "wiki.local", "paths": ["/"]}]
ingress.tls	Ingress TLS configuration	[]
postgresql.enabled	Deploy postgres server (see below)	true
postgresql.postgresqlDatabase	Postgres database name	wiki
postgresql.postgresqlUser	Postgres username	postgres
postgresql.postgresqlHost	External postgres host	nil
postgresql.postgresqlPassword	External postgres password	nil
postgresql.existingSecret	Provide an existing Secret for postgres	nil
postgresql.existingSecretKey	The postgres password key in the existing Secret	postgresql-password
postgresql.postgresqlPort	External postgres port	5432
postgresql.ssl	Enable external postgres SSL connection	false
postgresql.ca	Certificate of Authority path for postgres	nil
postgresql.persistence.enabled	Enable postgres persistence using PVC	true
postgresql.persistence.existingClaim	Provide an existing PersistentVolumeClaim for postgres	nil
postgresql.persistence.storageClass	Postgres PVC Storage Class (example: nfs)	nil
postgresql.persistence.size	Postgers PVC Storage Request	8Gi

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

$ helm install --name my-release \
  --set postgresql.persistence.enabled=false \
   . 

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

$ helm install --name my-release -f values.yaml . 

Tip: You can use the default values.yaml

PostgresSQL

By default, PostgreSQL is installed as part of the chart.

Using an external PostgreSQL server

To use an external PostgreSQL server, set postgresql.enabled to false and then set postgresql.postgresqlHost and postgresql.postgresqlPassword. To use an existing Secret, set postgresql.existingSecret. The other options (postgresql.postgresqlDatabase, postgresql.postgresqlUser, postgresql.postgresqlPort and postgresql.existingSecretKey) may also want changing from their default values.

To use an SSL connection you can set postgresql.ssl to true and if needed the path to a Certificate of Authority can be set using postgresql.ca to /path/to/ca. Default postgresql.ssl value is false.

If postgresql.existingSecret is not specified, you also need to add the following Helm template to your deployment in order to create the postgresql Secret:

kind: Secret
apiVersion: v1
metadata:
  name: {{ template "wiki.postgresql.secret" . }}
data:
  {{ template "wiki.postgresql.secretKey" . }}: "{{ .Values.postgresql.postgresqlPassword | b64enc }}"

Persistence

Persistent Volume Claims are used to keep the data across deployments. This is known to work in GCE, AWS, and minikube. See the Configuration section to configure the PVC or to disable persistence.

Ingress

This chart provides support for Ingress resource. If you have an available Ingress Controller such as Nginx or Traefik you maybe want to set ingress.enabled to true and add ingress.hosts for the URL. Then, you should be able to access the installation using that address.