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 3.0-beta3+
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.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 |
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 |
dict "images" (list .Values.path.to.the.image1, .Values.path.to.the.image2) "global" .Values.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 |
Names
| Helper identifier |
Description |
Expected Inpput |
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. |
Storage
| Helper identifier |
Description |
Expected Input |
common.affinities.node.soft |
Return a soft nodeAffinity definition |
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 . |
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" $ |
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" "context" $ secret and field 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.
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
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
