ConfigMap Replicator Controller

Overview

The ConfigMap Replicator controller can be used to simplify the replication of ConfigMaps across namespaces. This controller allows users to easily copy, synchronize, or replicate ConfigMaps from one namespace to one or more target namespaces.

Features

• Easy Replication: Replicate ConfigMaps across multiple namespaces.
• Fine-Grained Control: Specify which namespaces to include or exclude from replication.
• Annotation-Based Configuration: Control replication behavior using simple Kubernetes annotations.

Installation

The configmap-replicator controller can be installed via Helm. To install, add the Helm chart repository:

helm repo add cm-repo https://dm0275.github.io/configmap-replicator \
  && helm repo update

Install the latest version of the controller by running:

helm install configmap-replicator cm-repo/configmap-replicator

Helm Chart Values

Below is a table with the values available in the Helm chart:

Parameter	Description	Default Value
replicaCount	Number of replicas for the controller	1
image.pullPolicy	Image pull policy	IfNotPresent
image.tag	Image tag (defaults to chart appVersion)	""
imagePullSecrets	List of image pull secrets	[]
nameOverride	Override name of the chart	""
fullnameOverride	Override full name of the chart	""
rbac.create	Create RBAC(Role & RoleBinding) configurations for the controller	true
rbac.serviceAccount.name	Name of the ServiceAccount	""
rbac.clusterRole.name	Name of the ClusterRole	""
rbac.clusterRoleBinding.name	Name of the ClusterRoleBinding	""
serviceAccount.create	Create a new ServiceAccount	true
serviceAccount.automount	Automount ServiceAccount API credentials	true
serviceAccount.annotations	Annotations for the ServiceAccount	{}
serviceAccount.name	ServiceAccount name	""
podAnnotations	Annotations for the pod	{}
podLabels	Labels for the pod	{}
resources.limits.cpu	CPU limit for the container	1
resources.limits.memory	Memory limit for the container	128Mi
resources.requests.cpu	CPU request for the container	100m
resources.requests.memory	Memory request for the container	128Mi
nodeSelector	Node selector for pod scheduling	{}
tolerations	Tolerations for pod scheduling	[]
affinity	Affinity rules for pod scheduling	{}
replicator.reconciliationInterval	Interval for ConfigMap reconciliation	1m

Usage

Once deployed, the configmap-replicator will automatically replicate ConfigMaps based on the annotations you specify.

Enable Replication

To enable replication of a ConfigMap across all namespaces, add the following annotation to your ConfigMap:

annotations:
  configmap-replicator/replication-allowed: "true"

Exclude Specific Namespaces

If you want to exclude specific namespaces from replication, use the following annotation:

annotations:
  configmap-replicator/replication-allowed: "true"
  configmap-replicator/excluded-namespaces: "kube-system"

Replicate to Specific Namespaces Only

To replicate the ConfigMap to a specific set of namespaces, use this annotation:

annotations:
  configmap-replicator/replication-allowed: "true"
  configmap-replicator/allowed-namespaces: "team1,team2"

Build from source

To build the configmap-replicator controller, follow the steps below:

• Build the controller using Gradle:

  gradle build

License

This project is licensed under the Apache License. See the LICENSE file for details.