k8s-namespace-cloner

k8s-namespace-cloner

A simple Golang application designed to clone a Kubernetes namespace into a target namespace, including specific resources.

Overview

The k8s-namespace-cloner tool facilitates the duplication of resources from one Kubernetes namespace to another. This can be particularly useful in scenarios where you want to replicate a namespace's configuration for testing, backup, or migration purposes.

Prerequisites

• Go 1.x
• Kubernetes cluster access configured with kubectl
• Annotate your namespaces to be cloned with this annotation cloner.io/enabled:True. E.g. Your namespace definition will look like the below:

apiVersion: v1
kind: Namespace
metadata:
  annotations:
    cloner.io/enabled: "True" ## Notice the annotation
  labels:
    kubernetes.io/metadata.name: vv
  name: mynamespace
spec:
  finalizers:
  - kubernetes

Features

• Clones a source namespace with the above annotation
• For safety in public cloud environments, only clones services of type ClusterIP, ExternalName and NodePort. Does not clone Loadbalancer service types - as this will create external DNS names if allowed
• Support for Enabling kube-green for adding custom annotations to sleep and wake up resources. Ref: https://kube-green.dev/docs/getting-started/

Installation

Clone the repository to your local machine:

go run main.go

Initialization for Cluster (Pre-Requisites)

Sample Application Deployment in cluster for testing

cd sample-charts
helm template --dry-run sample-app sample-app -f sample-app/values.yaml > deploy.yaml
kubectl apply -f deploy.yaml

• The above will create a new namespace called 'sample' (specified in the sample-charts/sample-app/values.yaml).
• In case you want to create more such namespaces/applications, simply change the values of namespace, POD and app in values.yaml, redo helm template --dry-run sample-app sample-app -f sample-app/values.yaml > deploy.yaml && kubectl apply -f deploy.yaml and see multiple namespaces

Note: In case the above annotation isn't available in the source namespace, the cloner will return empty on the /v1/namespaces API.

Istio installation for Creating Virtual services

• For kind clusters, install the metrics server(Ref: https://gist.github.com/sanketsudake/a089e691286bf2189bfedf295222bd43)
• Install istio CRDs, istiod and istio-ingress controller.

$ helm repo add istio https://istio-release.storage.googleapis.com/charts
$ helm install istiod istio/istiod --namespace istio-system --create-namespace --version "~1.20.3" --wait
$ helm install istio-ingress istio/gateway --namespace istio-system --create-namespace --version "~1.20.3" --wait 

Kind Cluster & Kube Green Deployment

(Note: Instructions with Kind Cluster at https://kube-green.dev/docs/tutorials/kind/. This is for local development)

• Ensure all the namespaces to be cloned have the cloner.io/enabled:True (Look at the annotations section above)
• Install Cert Manager if not already (Ref: https://cert-manager.io/docs/installation/kubectl)

kubectl apply -f https://github.com/cert-manager/cert-manager/releases/download/v1.14.2/cert-manager.yaml
kubectl get pods -n cert-manager ## Ensure the pods are going into a running state

• Install kube-green (https://kube-green.dev/docs/install/)

kubectl apply -f https://github.com/kube-green/kube-green/releases/latest/download/kube-green.yaml
kubectl get pods -n kube-green ## Ensure the pods are going into a running state

Generating Documentation in Markdown:

npm install -g widdershins widdershins --search false --language_tabs 'shell:Shell' 'javascript:JavaScript' --summary docs/swagger.json -o docs/swagger.md

Routes:

Use the swagger documentation at docs/swagger.json to load the routes. The following explains a bunch of routes. Route Documentation Available at docs/swagger.md

Apply the file rolebinding.yaml onto the cluster for giving full operations to this service account for running the code in cluster kubectl apply -f rolebinding.yaml

Generating Documentation

go get -u github.com/swaggo/swag/cmd/swag

The Documentation is available in docs/ folder

Running

Start in development mode:

go run main.go

Start in Production Mode: go run main.go -production