Scott Rigby scottrigby

Kubernetes clusters using preemtible instances

Motivation

People experimenting with kubernetes clusters on the GKE not necessarily have money to keep a full cluster on at all time. GKE clusters can be easily resized, but this still incurs in the full instance cost when the cluster is up.

Google has added preemptible instances that are ideal for many

Set the default size for new Docker for Mac disk images

UPDATE: The instructions here are no longer necessary! Resizing the disk image is now possible right from the UI since Docker for Mac Version 17.12.0-ce-mac49 (21995).

If you are getting the error: No space left on device

Configuring the qcow2 size cap is possible in the current versions:

# my disk is currently 64GiB

Hosted Chart Repository Requirements

Background

Kubernetes Helm has the ability to work with remotely hosted Charts. While charts can be seen in the community provided charts, the charts themselves can be privately or separately hosted for an organization or individual.

There are currently 3 major ways to host your own chart repository:

Helm provides a means to generate a chart repository that can be hosted on a web server, object storage, or via a similar setup.
App Registry provides a system, similar to the handling of Docker images, to store charts. In this setup one can push or pull charts in a similar way to container images. There is a spec and Quay, the image hosting service, has implemented it. For Helm to interact with this API a plugin is required.

	# Backup
	docker exec CONTAINER /usr/bin/mysqldump -u root --password=root DATABASE > backup.sql

	# Restore
	cat backup.sql \| docker exec -i CONTAINER /usr/bin/mysql -u root --password=root DATABASE

	#!/bin/bash

	VERSION="20150504"

	usage() {
	cat << __EOF
	$0 usage:

	$0 [options]

	#!/bin/bash

	# @file
	# See HELP().
	# This script is useful until functionality is adopted into Helm.
	#
	# Follow @link https://github.com/kubernetes/helm/issues/1947 the issue. @endlink

	# Define SCRIPT var for help and validation output.
	SCRIPT=`basename ${BASH_SOURCE[0]}`

	#!/bin/sh

	# See https://github.com/kubernetes/helm/blob/master/docs/rbac.md#tiller-and-role-based-access-control

	echo 'apiVersion: v1
	kind: ServiceAccount
	metadata:
	name: tiller
	namespace: kube-system
	---

	FROM bitnami/drupal:8

	# Allow user codebase to include a custom composer merge file.
	# See https://github.com/wikimedia/composer-merge-plugin.
	COPY merge-composer.json /opt/bitnami
	RUN apt-get update && apt-get install -y jq
	RUN cd /opt/bitnami/drupal \
	&& tmp=$(mktemp) \
	&& cat composer.json \| jq '.extra."merge-plugin".include \|= .+ ["../merge-composer.json"]' > "$tmp" \
	&& mv "$tmp" composer.json \

	#!/bin/bash
	echo 'Why did the guy get fired from the orange juice factory?'; read ANSWER;
	echo "He couldn’t concentrate! 🍊😂😭. But '${ANSWER}' is funny too."

	FROM bitnami/drupal:8

	COPY custom-app-entrypoint.sh /

	ENTRYPOINT ["/custom-app-entrypoint.sh"]
	CMD ["/run.sh"]