Dump cluster state to YAML

kubescan.sh

#!/usr/bin/env bash

# USAGE
# bash kubescan.sh kubeconfig.yaml  > state.yaml

# Goal: 
# - Provide a quick way to dump the state of a cluster for analysis
# - Simplify verification of live state of the cluster



KUBECONFIG=${1:-${KUBECONFIG}}
shift;

# NB: this should run AFTER the KUBECONFIG default above, in case environment does not provide KUBECONFIG
set -euo pipefail

fail () {
  echo "$2" >&2
  exit $1
}

test -f ${KUBECONFIG} || fail 1 "Provide a valid kubeconfig file" 


kubedo () {
  kubectl --kubeconfig=${KUBECONFIG} -o yaml "${@}"
}

yaml_doc () {
  echo '%YAML 1.1'
  echo '--- #' $1
  cat
  echo '...'
}



while read t; do
    echo "Reading type: ${t}" >&2
    kubedo get ${t} | yaml_doc "${t}"
done < <(kubectl api-resources --verbs=list --namespaced=false -o name)


while read t; do
    echo "Reading type: ${t}" >&2
    kubedo get ${t} --all-namespaces | yaml_doc "${t}"
done < <(kubectl api-resources --verbs=list --namespaced=true -o name)