Dump Kubernetes state as yaml

dump_k8s.sh

#!/usr/bin/env bash
# set -x

mkdir output

KUBECONFIG=/Users/nico/real-kubeconfig

SKIP_RESOURCES=(
  apiservices
  bindings
  blockaffinities
  certificaterequests
  certificatesigningrequests
  challenges
  clusterinformations
  componentstatuses
  controllerrevisions
  csidrivers
  csinodes
  customresourcedefinitions
  endpoints
  events
  felixconfigurations
  globalnetworkpolicies
  globalnetworksets 
  hostendpoints
  ipamblocks
  ipamconfigs
  ipamhandles
  ippools
  limitranges
  localsubjectaccessreviews
  namespaces
  flowschemas
  prioritylevelconfigurations
  tlscertificatedelegations
  ingressclasses
  nodes
  orders
  persistentvolumeclaims
  persistentvolumes
  pods
  priorityclasses
  selfsubjectaccessreviews
  selfsubjectrulesreviews
  subjectaccessreviews
  volumeattachments
)

SKIP_NAMESPACES=(
  cert-manager
)


k8s() {
  kubectl "--kubeconfig=$KUBECONFIG" "$@"
}


# get the first column of the output, skipping the header row
first_col() {
  awk '{if (NR!=1) {print $1}}' "$1"
}

NAMESPACES=$(k8s get ns | first_col | sort | uniq)
RESOURCES=$(k8s api-resources | first_col | sort | uniq)

for resource in $RESOURCES
do
  if [[ " ${SKIP_RESOURCES[*]} " =~ " $resource " ]]; then
    echo "skipping $resource"
    continue
  fi

  for namespace in $NAMESPACES
  do
    if [[ " ${SKIP_NAMESPACES[*]} " =~ " $namespace " ]]; then
      echo "skipping $namespace"
      continue
    fi

    path="output/$namespace/$resource"
    mkdir -p "$path"
    NS_RESOURCES=$(k8s -n "$namespace" get "$resource" | first_col)
    for ns_resource in $NS_RESOURCES
    do
      k8s -n "$namespace" get "$resource" "$ns_resource" -o yaml > "$path/$ns_resource.yml"
    done
  done
done

This is very slow and takes a long time to run! You may want adjust the skipped resources and namespaces