karthik101

Overview: running crc on a remote server

This document shows how to deploy an OpenShift instance on a server using CodeReady Containers (crc) that can be accessed remotely from one or more client machines (sometimes called a "headless" instance). This provides a low-cost test and development platform that can be shared by developers. Deploying this way also allows a user to create an instance that uses more cpu and memory resources than may be available on his or her laptop.

While there are benefits to this type of deployment, please note that the primary use case for crc is to deploy a local OpenShift instance on a workstation or laptop and access it directly from the same machine. The headless setup is configured completely outside of crc itself, and supporting a headless setup is beyond the mission of the crc development team. Please do not ask for changes to crc to support this type of deployment, it will only cost the team time as they politely decline :)

The instructions here were tested with F

Moved to: https://github.com/altermarkive/cloud-experiments/blob/master/other/bare-metal-kubernetes-with-kubespray/QuickAndDirtyKubernetesClusterWithKubespray.md

Install OpenShift Origin on one node (CENTOS) - commands:

1) Install docker

yum install docker -y 
systemctl start docker

Note:

echo "INSECURE_REGISTRY='--insecure-registry 172.30.0.0/16'" >> /etc/sysconfig/docker
systemctl enable docker

	# https://www.github.com/telugu-boy/

	import youtube_dl
	import getopt
	import sys
	import os

	# https://www.youtube.com/watch?v=obLq6k3clHo

	ydl_opts = {

	curl https://mirror.openshift.com/pub/openshift-v4/dependencies/rhcos/4.2/4.2.0/rhcos-4.2.0-x86_64-vmware.ova -o rhcos-4.2.0-x86_64-vmware.ova

	govc import.ova -name=rhcos-4.2.0-x86_64-vmware ./rhcos-4.2.0-x86_64-vmware.ova


	export GOVC_URL='vsphere.server.local
	export GOVC_USERNAME='admin@vsphere.local'
	export GOVC_PASSWORD='password
	export GOVC_INSECURE=1
	export GOVC_NETWORK='NETWORK'


	Questions are not from any actual exam!!!



	Q: Create a job that calculates pi to 2000 decimal points using the container with the image named perl
	and the following commands issued to the container: ["perl", "-Mbignum=bpi", "-wle", "print bpi(2000)"]
	Once the job has completed, check the logs to and export the result to pi-result.txt.

	Solution:

	minikube stop; minikube delete &&
	docker stop $(docker ps -aq) &&
	rm -rf ~/.kube ~/.minikube &&
	sudo rm -rf /usr/local/bin/localkube /usr/local/bin/minikube &&
	launchctl stop 'kubelet.mount' &&
	launchctl stop localkube.service &&
	launchctl disable localkube.service &&
	sudo rm -rf /etc/kubernetes/ &&
	docker system prune -af --volumes

	#!/bin/sh
	# Launch a Pod ab-using a privileged=true to land on a Kubernetes node cluster as root,
	# uses `privileged: true` to then nsenter init mount its (root) namespace,
	# hostPID and hostNetwork already set for the Pod.
	node=${1}
	case "${node}" in
	"")
	nodeSelector=''
	podName=${USER+${USER}-}sudo-any
	;;

	default['sshd']['sshd_config']['AuthenticationMethods'] = 'publickey,keyboard-interactive:pam'
	default['sshd']['sshd_config']['ChallengeResponseAuthentication'] = 'yes'
	default['sshd']['sshd_config']['PasswordAuthentication'] = 'no'

	#! /usr/bin/env ruby

	# NOTE: Requires Ruby 2.1 or greater.

	# This script can be used to parse and dump the information from
	# the 'html/contact_info.htm' file in a Facebook user data ZIP download.
	#
	# It prints all cell phone call + SMS message + MMS records, plus a summary of each.
	#
	# It also dumps all of the records into CSV files inside a 'CSV' folder, that is created