Script to get all the resources yaml file from the Kubernetes context

cluster_export.sh

#!/bin/bash

# How to run: `./backup_cluster.sh | tee export-$(date +%s).log`

set -e

if [ -n "${DEBUG}" ]; then
  set -x
fi

SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"

NAMESPACES=$(kubectl get namespace | awk '{print $1}' | tail -n +2)
RESOURCES=$(kubectl api-resources --verbs=list --namespaced=true -o name)
GLOBAL_RESOURCES=$(kubectl api-resources --verbs=list --namespaced=false -o name)

CURRENT_CONTEXT=$(kubectl config current-context)

NAMESPACES_COUNT=$(echo "${NAMESPACES}" | wc -l | sed 's/ //g')
RESOURCES_COUNT=$(echo "${RESOURCES}" | wc -l | sed 's/ //g')
GLOBAL_RESOURCES_COUNT=$(echo "${GLOBAL_RESOURCES}" | wc -l | sed 's/ //g')

if [ -d "${SCRIPT_DIR}/${CURRENT_CONTEXT}" ]; then
  echo "The directory '${CURRENT_CONTEXT}' already exists"
  exit 1
fi

if [ "$(ls -A "${SCRIPT_DIR}/${CURRENT_CONTEXT}" >/dev/null 2>&1)" ]; then
  echo "The directory '${CURRENT_CONTEXT}' is not empty"
  exit 1
fi

mkdir "${SCRIPT_DIR}/${CURRENT_CONTEXT}"

echo "Exporting '${CURRENT_CONTEXT}' context"
echo
echo "Namespaces: ${NAMESPACES_COUNT}"
echo "Global resources: ${GLOBAL_RESOURCES_COUNT}"
echo "Resources: ${RESOURCES_COUNT}"

echo
echo "[Exporting global resources]"
echo

for resources in ${GLOBAL_RESOURCES[@]}; do

  RESOURCE_COUNT=$(kubectl get --show-kind --ignore-not-found "${resources}" | tail -n +2 | wc -l | sed 's/ //g')

  echo "> Exporting '${resources}': ${RESOURCE_COUNT}"

  if [ "${RESOURCE_COUNT}" != "0" ]; then
    kubectl get --show-kind --ignore-not-found "${resources}" -o yaml \
      | yq eval 'del(.items[].metadata.resourceVersion)' - \
      | yq eval 'del(.items[].metadata.uid)' - \
      | yq eval 'del(.items[].metadata.creationTimestamp)' - \
      | yq eval 'del(.items[].metadata.selfLink)' - \
      | yq eval 'del(.items[].metadata.managedFields)' - \
      | yq eval 'del(.items[].status)' - > "${SCRIPT_DIR}/${CURRENT_CONTEXT}/${resources}.yaml"
  fi
done

echo
echo "[Exporting namespaced resources]"
echo

for namespace in ${NAMESPACES[@]}; do
  if [ "${namespace}" == "kube-system" ] || [ "${namespace}" == "kube-node-lease" ]; then
    echo "# Skipped '${namespace}'!"
    continue
  fi

  mkdir "${SCRIPT_DIR}/${CURRENT_CONTEXT}/${namespace}"

  echo "> Exporting namespace '${namespace}':"

  for resources in ${RESOURCES[@]}; do

    RESOURCE_COUNT=$(kubectl get --show-kind --ignore-not-found -n "${namespace}" "${resources}" | tail -n +2 | wc -l | sed 's/ //g')

    echo "  - ${resources}: ${RESOURCE_COUNT}"

    if [ "${RESOURCE_COUNT}" != "0" ]; then
      kubectl get --show-kind --ignore-not-found -n "${namespace}" "${resources}" -o yaml \
        | yq eval 'del(.items[].metadata.resourceVersion)' - \
        | yq eval 'del(.items[].metadata.uid)' - \
        | yq eval 'del(.items[].metadata.creationTimestamp)' - \
        | yq eval 'del(.items[].metadata.selfLink)' - \
        | yq eval 'del(.items[].metadata.managedFields)' - \
        | yq eval 'del(.items[].status)' - > "${SCRIPT_DIR}/${CURRENT_CONTEXT}/${namespace}/${resources}.yaml"
    fi
  done

  echo "+ Completed export '${namespace}'!"
done

echo "Completed export for '${CURRENT_CONTEXT}' context"