Karl Isenberg karlkfi

SWE on GKE Enterprise at Google. Previously: Cruise, Mesosphere, Pivotal.

karlkfi / count-k8s-objects.sh

Last active January 16, 2025 01:31

count-k8s-objects.sh - Count the number of Kubernetes objects in a directory and error if there are too many

	#!/bin/bash

	# This script recursively counts the number of Kubernetes objects in YAML and JSON files within a directory.
	# It uses `yq` to parse YAML and JSON, prints the object count for each file,
	# and also prints the total count for each directory. It errors if the total object count exceeds 2000.
	# It skips directories that start with "."

	set -euo pipefail

	# --- Configuration ---

karlkfi / assign-kube-system-node-selector.yaml

Created August 15, 2024 22:55

Use Gatekeeper mutating webhooks to auto-assign Pods from a namespace to a specific node pool

	apiVersion: mutations.gatekeeper.sh/v1
	kind: Assign
	metadata:
	name: kube-system-node-selector
	spec:
	applyTo:
	- groups: [""]
	kinds: ["Pod"]
	versions: ["v1"]
	match:

karlkfi / json-encode.py

Created August 6, 2021 12:29

json encode in starlark

	# In a Starlark context that doesn't support json or recursion,
	# you might become desperate enough to do something crazy like this...

	def quoteIfString(obj):
	if type(obj) == "string":
	return '"' + obj + '"'
	else:
	return obj

	def jsonEncode(obj):

karlkfi / kpt-pkg-status.sh

Created June 11, 2021 21:25

kpt-pkg-status.sh - Get the status of all resources in a directory.

	#!/usr/bin/env bash

	set -o errexit -o nounset -o pipefail

	PKG_PATH="${1:-.}"

	if ! hash jq 2>/dev/null; then
	echo >&2 "Error: jq not found. Please install jq: https://stedolan.github.io/jq/download/"
	fi

karlkfi / bash2asciicast.sh

Created February 2, 2021 07:16

bash2asciicast.sh - Convert a bash script into an asciinema recording

	#!/usr/bin/env bash

	# Convert a bash script into an asciinema recording

	set -o errexit -o nounset -o pipefail

	INPUT_FILE=${1:-}
	if [[ -z "${INPUT_FILE}" ]]; then
	echo "Syntax: $0 <path/to/bash-scipt.sh> <path/to/out.cast>"
	exit 1

karlkfi / bash2asciicast.sh

Last active February 2, 2021 07:36

bash2asciicast.sh - Convert a bash script into an asciicast recording

	#!/usr/bin/env bash

	# Convert a bash script into an asciicast recording

	set -o errexit -o nounset -o pipefail

	USER=karl
	WORKDIR="~/workspace"
	PROMPT="\u001b]0;Cloud Shell\u0007${USER}@cloudshell:\u001b[1;34m${WORKDIR}\u001b[00m$ \u001bkcloudshell\u001b\\\\"

karlkfi / gist:98c607103a0e162c1fc39356b3c3c764

Created February 13, 2020 19:12

	---
	apiVersion: kind.x-k8s.io/v1alpha4
	kind: Cluster
	networking:
	# expose to private network
	apiServerAddress: "0.0.0.0"
	# fixed port so Vault auth backend can find the API
	apiServerPort: 32769
	kubeadmConfigPatchesJSON6902:
	- group: kubeadm.k8s.io

karlkfi / dcos-install-prereqs.sh

Last active November 1, 2017 23:31

Install DC/OS node prerequisites on CentOS/RHEL 7.2+

	#!/usr/bin/env bash

	# Exit on error, unset variable, or error in pipe chain
	set -o errexit -o nounset -o pipefail

	# For setenforce & xfs_info
	PATH=$PATH:/usr/sbin:/sbin

	echo "Validating distro..."
	distro="$(source /etc/os-release && echo "${ID}")"

karlkfi / semver-compare.sh

Created May 16, 2017 21:33

Compare two semantic versions in bash

	# return 0 if version A >= version B using semanatic versioning
	function semver_gte() {
	VERISON_A="${1}"
	VERISON_B="${2}"
	SEMVER_PATTERN="[^0-9]$[0-9][0-9]$[.]$[0-9][0-9]$[.]$[0-9][0-9]$.*"
	SEG1_A="$(echo "${VERISON_A}" \| sed -e "s#${SEMVER_PATTERN}#\1#")"
	SEG1_B="$(echo "${VERISON_B}" \| sed -e "s#${SEMVER_PATTERN}#\1#")"
	[[ ${SEG1_A} < ${SEG1_B} ]] && return 1
	[[ ${SEG1_A} > ${SEG1_B} ]] && return 0
	SEG2_A="$(echo "${VERISON_A}" \| sed -e "s#${SEMVER_PATTERN}#\2#")"

karlkfi / changes.sh

Created October 18, 2016 01:48

Generate markdown change log from merged PR titles