A way to quickly create a backup of your Kubernetes cluster with manifests for each resource per resource type per namespace (don't use this as a serious backup strategy)

cluster-backup.sh

#!/bin/bash

# Check if the backup directory is provided as an argument
if [ -z "$1" ]; then
  echo "Usage: $0 <backup_directory>"
  exit 1
fi

# Get the backup directory from the command line argument
BACKUP_DIR="$1"

# Get the list of namespaces
NAMESPACE_LIST=$(kubectl get namespaces -o jsonpath='{.items[*].metadata.name}')

# Loop through each namespace
for NAMESPACE in $NAMESPACE_LIST; do
  # Create a directory for the namespace
  NAMESPACE_DIR="${BACKUP_DIR}/${NAMESPACE}"
  mkdir -p "$NAMESPACE_DIR"

  # Get the list of resources for the namespace
  RESOURCE_LIST=$(kubectl api-resources --verbs=list --namespaced=true -o name | tr '\n' ' ')

  # Loop through each resource
  for RESOURCE in $RESOURCE_LIST; do
    # Create a directory for the resource
    RESOURCE_DIR="${NAMESPACE_DIR}/${RESOURCE}"
    
    # Get the resources of the current type in the current namespace
    RESOURCE_NAMES=$(kubectl get "$RESOURCE" -n "$NAMESPACE" -o jsonpath='{.items[*].metadata.name}')

    # Check if there are resources of the current type
    if [ -n "$RESOURCE_NAMES" ]; then
      mkdir -p "$RESOURCE_DIR"

      # Loop through each resource name
      for RESOURCE_NAME in $RESOURCE_NAMES; do
        # Get the resource in YAML format and save it to a file
        kubectl get "$RESOURCE" "$RESOURCE_NAME" -n "$NAMESPACE" -o yaml > "${RESOURCE_DIR}/${RESOURCE_NAME}.yaml"
      done
    fi
  done
done

echo "Cluster backup completed!"