Bitnami Common Library Chart

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

TL;DR

dependencies:
  - name: common
    version: 0.x.x
    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 3.1.0

Parameters

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

Affinities

Helper identifier	Description	Expected Input
common.affinities.node.soft	Return a soft nodeAffinity definition	dict "key" "FOO" "values" (list "BAR" "BAZ")
common.affinities.node.hard	Return a hard nodeAffinity definition	dict "key" "FOO" "values" (list "BAR" "BAZ")
common.affinities.pod.soft	Return a soft podAffinity/podAntiAffinity definition	dict "component" "FOO" "context" $
common.affinities.pod.hard	Return a hard podAffinity/podAntiAffinity definition	dict "component" "FOO" "context" $

Capabilities

Helper identifier	Description	Expected Input
common.capabilities.kubeVersion	Return the target Kubernetes version (using client default if .Values.kubeVersion is not set).	. Chart context
common.capabilities.cronjob.apiVersion	Return the appropriate apiVersion for cronjob.	. Chart context
common.capabilities.deployment.apiVersion	Return the appropriate apiVersion for deployment.	. Chart context
common.capabilities.statefulset.apiVersion	Return the appropriate apiVersion for statefulset.	. Chart context
common.capabilities.ingress.apiVersion	Return the appropriate apiVersion for ingress.	. Chart context
common.capabilities.rbac.apiVersion	Return the appropriate apiVersion for RBAC resources.	. Chart context
common.capabilities.crd.apiVersion	Return the appropriate apiVersion for CRDs.	. Chart context
common.capabilities.policy.apiVersion	Return the appropriate apiVersion for podsecuritypolicy.	. Chart context
common.capabilities.networkPolicy.apiVersion	Return the appropriate apiVersion for networkpolicy.	. Chart context
common.capabilities.supportsHelmVersion	Returns true if the used Helm version is 3.3+	. Chart context

Errors

Helper identifier	Description	Expected Input
common.errors.upgrade.passwords.empty	It will ensure required passwords are given when we are upgrading a chart. If validationErrors is not empty it will throw an error and will stop the upgrade action.	dict "validationErrors" (list $validationError00 $validationError01) "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 (deprecated: use common.images.renderPullSecrets instead)	dict "images" (list .Values.path.to.the.image1, .Values.path.to.the.image2) "global" .Values.global
common.images.renderPullSecrets	Return the proper Docker Image Registry Secret Names (evaluates values as templates)	dict "images" (list .Values.path.to.the.image1, .Values.path.to.the.image2) "context" $

Ingress

Helper identifier	Description	Expected Input
common.ingress.backend	Generate a proper Ingress backend entry depending on the API version	dict "serviceName" "foo" "servicePort" "bar", see the Ingress deprecation notice for the syntax differences
common.ingress.supportsPathType	Prints "true" if the pathType field is supported	. Chart context
common.ingress.supportsIngressClassname	Prints "true" if the ingressClassname field is supported	. Chart context

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

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

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.
common.passwords.manage	Generate secret password or retrieve one if already created.	dict "secret" "secret-name" "key" "keyName" "providedValues" (list "path.to.password1" "path.to.password2") "length" 10 "strong" false "chartName" "chartName" "context" $, length, strong and chartNAme fields are optional.
common.secrets.exists	Returns whether a previous generated secret already exists.	dict "secret" "secret-name" "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 frequently is the chart context $ or .

Utils

Helper identifier	Description	Expected Input
common.utils.fieldToEnvVar	Build environment variable name given a field.	dict "field" "my-password"
common.utils.secret.getvalue	Print instructions to get a secret value.	dict "secret" "secret-name" "field" "secret-value-field" "context" $
common.utils.getValueFromKey	Gets a value from .Values object given its key path	dict "key" "path.to.key" "context" $
common.utils.getKeyFromList	Returns first .Values key with a defined value or first of the list if all non-defined	dict "keys" (list "path.to.key1" "path.to.key2") "context" $

Validations

Helper identifier	Description	Expected Input
common.validations.values.single.empty	Validate a value must not be empty.	dict "valueKey" "path.to.value" "secret" "secret.name" "field" "my-password" "subchart" "subchart" "context" $ secret, field and subchart are optional. In case they are given, the helper will generate a how to get instruction. See ValidateValue
common.validations.values.multiple.empty	Validate a multiple values must not be empty. It returns a shared error for all the values.	dict "required" (list $validateValueConf00 $validateValueConf01) "context" $. See ValidateValue
common.validations.values.mariadb.passwords	This helper will ensure required password for MariaDB are not empty. It returns a shared error for all the values.	dict "secret" "mariadb-secret" "subchart" "true" "context" $ subchart field is optional and could be true or false it depends on where you will use mariadb chart and the helper.
common.validations.values.postgresql.passwords	This helper will ensure required password for PostgreSQL are not empty. It returns a shared error for all the values.	dict "secret" "postgresql-secret" "subchart" "true" "context" $ subchart field is optional and could be true or false it depends on where you will use postgresql chart and the helper.
common.validations.values.redis.passwords	This helper will ensure required password for Redis™ are not empty. It returns a shared error for all the values.	dict "secret" "redis-secret" "subchart" "true" "context" $ subchart field is optional and could be true or false it depends on where you will use redis chart and the helper.
common.validations.values.cassandra.passwords	This helper will ensure required password for Cassandra are not empty. It returns a shared error for all the values.	dict "secret" "cassandra-secret" "subchart" "true" "context" $ subchart field is optional and could be true or false it depends on where you will use cassandra chart and the helper.
common.validations.values.mongodb.passwords	This helper will ensure required password for MongoDB® are not empty. It returns a shared error for all the values.	dict "secret" "mongodb-secret" "subchart" "true" "context" $ subchart field is optional and could be true or false it depends on where you will use mongodb chart and the helper.

Warnings

Helper identifier	Description	Expected Input
common.warnings.rollingTag	Warning about using rolling tag.	ImageRoot see ImageRoot 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 (evaluated as templates).

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 possibility 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

ValidateValue

NOTES.txt

{{- $validateValueConf00 := (dict "valueKey" "path.to.value00" "secret" "secretName" "field" "password-00") -}}
{{- $validateValueConf01 := (dict "valueKey" "path.to.value01" "secret" "secretName" "field" "password-01") -}}

{{ include "common.validations.values.multiple.empty" (dict "required" (list $validateValueConf00 $validateValueConf01) "context" $) }}

If we force those values to be empty we will see some alerts

$ helm install test mychart --set path.to.value00="",path.to.value01=""
    'path.to.value00' must not be empty, please add '--set path.to.value00=$PASSWORD_00' to the command. To get the current value:

        export PASSWORD_00=$(kubectl get secret --namespace default secretName -o jsonpath="{.data.password-00}" | base64 --decode)

    'path.to.value01' must not be empty, please add '--set path.to.value01=$PASSWORD_01' to the command. To get the current value:

        export PASSWORD_01=$(kubectl get secret --namespace default secretName -o jsonpath="{.data.password-01}" | base64 --decode)

Upgrading

To 1.0.0

On November 13, 2020, Helm v2 support was formally finished, this major version is the result of the required changes applied to the Helm Chart to be able to incorporate the different features added in Helm v3 and to be consistent with the Helm project itself regarding the Helm v2 EOL.

What changes were introduced in this major version?

• Previous versions of this Helm Chart use apiVersion: v1 (installable by both Helm 2 and 3), this Helm Chart was updated to apiVersion: v2 (installable by Helm 3 only). Here you can find more information about the apiVersion field.
• Use type: library. Here you can find more information.
• The different fields present in the Chart.yaml file has been ordered alphabetically in a homogeneous way for all the Bitnami Helm Charts

Considerations when upgrading to this version

• If you want to upgrade to this version from a previous one installed with Helm v3, you shouldn't face any issues
• If you want to upgrade to this version using Helm v2, this scenario is not supported as this version doesn't support Helm v2 anymore
• If you installed the previous version with Helm v2 and wants to upgrade to this version with Helm v3, please refer to the official Helm documentation about migrating from Helm v2 to v3

Useful links

• https://docs.bitnami.com/tutorials/resolve-helm2-helm3-post-migration-issues/
• https://helm.sh/docs/topics/v2_v3_migration/
• https://helm.sh/blog/migrate-from-helm-v2-to-helm-v3/