charts/bitnami/common

Bitnami Common Library Chart

A Helm Library Chart for grouping common logic between bitnami charts.

TL;DR;

dependencies:
  - name: common
    version: 0.1.0
    repository: https://charts.bitnami.com/bitnami

$ helm dependency update

apiVersion: v1
kind: ConfigMap
metadata:
  name: {{ include "common.names.fullname" . }}
data:
  myvalue: "Hello World"

Introduction

This chart provides a common template helpers which can be used to develop new charts using Helm package manager.

Bitnami charts can be used with Kubeapps for deployment and management of Helm Charts in clusters. This Helm chart has been tested on top of Bitnami Kubernetes Production Runtime (BKPR). Deploy BKPR to get automated TLS certificates, logging and monitoring for your applications.

Prerequisites

• Kubernetes 1.12+
• Helm 2.12+ or Helm 3.0-beta3+

Parameters

The following table lists the helpers available in the library which are scoped in different sections.

Names

Helper identifier	Description	Expected Input
common.names.name	Expand the name of the chart or use .Values.nameOverride	. Chart context
common.names.fullname	Create a default fully qualified app name.	. Chart context
common.names.chart	Chart name plus version	. Chart context

Images

Helper identifier	Description	Expected Input
common.images.image	Return the proper and full image name	dict "imageRoot" .Values.path.to.the.image "global" $, see ImageRoot for the structure.
common.images.pullSecrets	Return the proper Docker Image Registry Secret Names	dict "images" (list .Values.path.to.the.image1, .Values.path.to.the.image2) "global" $

Labels

Helper identifier	Description	Expected Input
common.labels.standard	Return Kubernetes standard labels	. Chart context
common.labels.matchLabels	Return the proper Docker Image Registry Secret Names	. Chart context

Storage

Helper identifier	Description	Expected Input
common.storage.class	Return the proper Storage Class	dict "persistence" .Values.path.to.the.persistence "global" $, see Persistence for the structure.

TplValues

Helper identifier	Description	Expected Input
common.tplvalues.render	Renders a value that contains template	dict "value" .Values.path.to.the.Value "context" $, value is the value should rendered as template, context frecuently is the chart context $ or .

Capabilities

Helper identifier	Description	Expected Input
common.capabilities.deployment.apiVersion	Return the appropriate apiVersion for deployment.	. Chart context
common.capabilities.ingress.apiVersion	Return the appropriate apiVersion for ingress.	. Chart context

Warnings

Helper identifier	Description	Expected Input
common.warnings.rollingTag	Warning about using rolling tag.	ImageRoot see ImageRoot for the structure.

Secrets

Helper identifier	Description	Expected Input
common.secrets.name	Generate the name of the secret.	dict "existingSecret" .Values.path.to.the.existingSecret "defaultNameSuffix" "mySuffix" "context" $ see ExistingSecret for the structure.
common.secrets.key	Generate secret key.	dict "existingSecret" .Values.path.to.the.existingSecret "key" "keyName" see ExistingSecret for the structure.

Special input schemas

ImageRoot

registry:
  type: string
  description: Docker registry where the image is located
  example: docker.io

repository:
  type: string
  description: Repository and image name
  example: bitnami/nginx

tag:
  type: string
  description: image tag
  example: 1.16.1-debian-10-r63

pullPolicy:
  type: string
  description: Specify a imagePullPolicy. Defaults to 'Always' if image tag is 'latest', else set to 'IfNotPresent'

pullSecrets:
  type: array
  items:
    type: string
  description: Optionally specify an array of imagePullSecrets.

debug:
  type: boolean
  description: Set to true if you would like to see extra information on logs
  example: false

## An instance would be:
# registry: docker.io
# repository: bitnami/nginx
# tag: 1.16.1-debian-10-r63
# pullPolicy: IfNotPresent
# debug: false

Persistence

enabled:
  type: boolean
  description: Whether enable persistence.
  example: true

storageClass:
  type: string
  description: Ghost data Persistent Volume Storage Class, If set to "-", storageClassName: "" which disables dynamic provisioning.
  example: "-"

accessMode:
  type: string
  description: Access mode for the Persistent Volume Storage.
  example: ReadWriteOnce

size:
  type: string
  description: Size the Persistent Volume Storage.
  example: 8Gi

path:
  type: string
  description: Path to be persisted.
  example: /bitnami

## An instance would be:
# enabled: true
# storageClass: "-"
# accessMode: ReadWriteOnce
# size: 8Gi
# path: /bitnami

ExistingSecret

name:
  type: string
  description: Name of the existing secret.
  example: mySecret
keyMapping:
  description: Mapping between the expected key name and the name of the key in the existing secret.
  type: object

## An instance would be:
# name: mySecret
# keyMapping:
#   password: myPasswordKey

Example of use

When we store sensitive data for a deployment in a secret, some times we want to give to users the possiblity of using theirs existing secrets.

# templates/secret.yaml
---
apiVersion: v1
kind: Secret
metadata:
  name: {{ include "common.names.fullname" . }}
  labels:
    app: {{ include "common.names.fullname" . }}
type: Opaque
data:
  password: {{ .Values.password | b64enc | quote }}

# templates/dpl.yaml
---
...
      env:
        - name: PASSWORD
          valueFrom:
            secretKeyRef:
              name: {{ include "common.secrets.name" (dict "existingSecret" .Values.existingSecret "context" $) }}
              key: {{ include "common.secrets.key" (dict "existingSecret" .Values.existingSecret "key" "password") }}
...

# values.yaml
---
name: mySecret
keyMapping:
  password: myPasswordKey

Notable changes

N/A