Radu Toader radut

Node.js on Apple Silicon

Node Version Manager (https://github.com/nvm-sh/nvm) works perfectly across native node installations as well as emulated Rosetta installations. The trick I am using here is to install one LTS version of node under Rosetta and another stable version as native binary.

TODO

find a way how to run the same node version on both platforms

Create a directory certs.
Generated the TLS keys under certs directory.
Run the docker command.

docker run \
	-p 6650:6650 -p 8080:8080 \
	-p 8081:8081 -p 6651:6651 \
	-p 8443:8443 \
	-v $PWD/certs:/certs \

openssl rand -hex 128

Quick and Dirty Ceph Cluster

This is a bare-bones guide on how to setup a Ceph cluster using ceph-ansible

This guide assumes:

Ansible is installed on your local machine
Eight Centos 7.2 nodes are provisioned and formatted with XFS
You have ssh and sudo access to your nodes

Ansible Setup

Kubernetes on (vanilla) Raspbian Lite

Yes - you can create a Kubernetes cluster with Raspberry Pis with the default operating system called Raspbian. This means you can carry on using all the tools and packages you're used to with the officially-supported OS.

This is part of a blog post Serverless Kubernetes home-lab with your Raspberry Pis written by Alex Ellis.

Copyright disclaimer: Please provide a link to the post and give attribution to the author if you plan to use this content in your own materials.

	package io.vertx.example;

	import java.io.IOException;
	import java.net.ServerSocket;
	import java.net.Socket;
	import java.util.concurrent.TimeUnit;

	public class Server {
	public static void main(String[] args) throws IOException, InterruptedException {
	ServerSocket serverSocket = new ServerSocket(8899, 1);

	#
	# This is the ultimate HAProxy 2.0 "Getting Started" config
	# It demonstrates many of the features available which are now available
	# While you may not need all of these things, this can serve
	# as a reference for your own configurations.
	#
	# Have questions? Check out our community Slack:
	# https://slack.haproxy.org/
	#

	import javax.net.ssl.SSLSocket;
	import javax.net.ssl.SSLSocketFactory;
	import java.io.*;

	/** Establish a SSL connection to a host and port, writes a byte and
	* prints the response. See
	* http://confluence.atlassian.com/display/JIRA/Connecting+to+SSL+services
	*/
	public class SSLPoke {
	public static void main(String[] args) {

	###################################################
	##
	## Alertmanager YAML configuration for routing.
	##
	## Will route alerts with a code_owner label to the slack-code-owners receiver
	## configured above, but will continue processing them to send to both a
	## central Slack channel (slack-monitoring) and PagerDuty receivers
	## (pd-warning and pd-critical)
	##

	* Shows a message while asserting like:

	ok: [host] => {
	"msg": "disk usage 4.2B of total 20.0GB (21.0%) (should exceed limit 90.0%)"
	}

	* Note this only looks at first mount point on current node
	* Fails if disk is near-full
	* Last step pushes to a push-based monitoring service, which will alert us if it doesn't get there after some time
	* Need to setup a variable `disk_limit`, which is the max acceptable usage ratio, e.g. set it to 0.8 if you want to keep disks within 80% of max size