Ravi Raja Merugu rrmerugu

Deploy K3s and Rancher on Raspberry Pi 4 cluster

Today I tried to setup a small Kubernetes cluster on top of 3 Raspberry Pi 4 (4GB Memory). Here is the steps to install the cluster.

Preparation

I have 3 Raspberry Pi 4 stacked with PoE headers and connected to a PoE switch at home. The are connected to Internet through a home router. All Pis are equipped with a 64GB Samsung SDXC card flushed with Ubuntu 20.04 image.

A non-exhaustive list of WebGL and WebGPU frameworks and libraries. It is mostly for learning purposes as some of the libraries listed are wip/outdated/not maintained anymore.

Engines and libraries ⚙️

Name	Stars	Last Commit	Description
three.js	![GitHub

Run a Scrapy spider on script

import scrapy

#--run a crawler in a script stuff
from pydispatch             import dispatcher
from scrapy                 import signals
from scrapy.crawler         import CrawlerProcess
from pydispatch             import dispatcher

Add Git Branch Name to Terminal Prompt (Linux/Mac)

Open ~/.bash_profile in your favorite editor and add the following content to the bottom.

# Git branch in prompt.

parse_git_branch() {

	function State() {
	this.actions = {};
	this.subscriptions = [];
	this.history = [];
	}

	State.prototype.subscribe = function(element, action, callback) {
	this.subscriptions[action] = this.subscriptions[action] \|\| [];
	this.subscriptions[action].push(function(data) {
	callback.apply(element, data);

	graph = JanusGraphFactory.open("conf/gremlin-server/janusgraph-cassandra-es-server.properties")

	prop = 'some_property_name'
	name = 'by' + prop

	size = graph.getOpenTransactions().size()
	if(size>0) {for(i=0;i<size;i++) {graph.getOpenTransactions().getAt(0).rollback()}}
	graph.getOpenTransactions()

	m = graph.openManagement()

	#!/bin/sh
	docker login -u $DOCKER_USER -p $DOCKER_PASS
	if [ "$TRAVIS_BRANCH" = "master" ]; then
	TAG="latest"
	else
	TAG="$TRAVIS_BRANCH"
	fi
	docker build -f Dockerfile -t $TRAVIS_REPO_SLUG:$TAG .
	docker push $TRAVIS_REPO_SLUG:$TAG

	# start GremlinServer
	# bin/gremlin-server.sh -i org.apache.tinkerpop gremlin-python 3.2.2-SNAPSHOT
	# bin/gremlin-server.sh conf/gremlin-server-modern-py.yaml

	from gremlin_python.process.graph_traversal import GraphTraversal
	from gremlin_python.process.graph_traversal import GraphTraversalSource
	from gremlin_python.process.graph_traversal import __
	from gremlin_python.process.traversal import Operator

	from gremlin_python.structure.io.graphson import GraphSONReader

	curl --include \
	--no-buffer \
	--header "Connection: Upgrade" \
	--header "Upgrade: websocket" \
	--header "Host: example.com:80" \
	--header "Origin: http://example.com:80" \
	--header "Sec-WebSocket-Key: SGVsbG8sIHdvcmxkIQ==" \
	--header "Sec-WebSocket-Version: 13" \
	http://example.com:80/

	sudo: required #is required to use docker service in travis

	language: php #can be any language, just php for example

	services:
	- docker # required, but travis uses older version of docker :(

	install:
	- echo "install nothing!" # put your normal pre-testing installs here