Ivan Shvedunov ivan4th

`$HOME`, Not So Sweet `$HOME`

Preface
1 What is $HOME to you?
2 Setup
- 2.1 Linux
2.1.4 xdg-user-dirs

Using Multus CNI in K3S

By default, K3S will run with flannel as the CNI and use custom directories to store CNI plugin binaries and config files(You can inspect the kubelet args K3S uses via journalctl -u k3s|grep cni-conf-dir). So you need to configure that properly When deploying Multus CNI.

For example given the official Multus manifests in https://github.com/intel/multus-cni/blob/36f2fd64e0965e639a0f1d17ab754f0130951aba/images/multus-daemonset.yml, the following changes are needed:

volumes:
 - name: cni

Nginx TLS SNI routing, based on subdomain pattern

Nginx can be configured to route to a backend, based on the server's domain name, which is included in the SSL/TLS handshake (Server Name Indication, SNI).
This works for http upstream servers, but also for other protocols, that can be secured with TLS.

prerequisites

at least nginx 1.15.9 to use variables in ssl_certificate and ssl_certificate_key.
check nginx -V for the following:
```
...
TLS SNI support enabled
```

The purpose of this document is to get you familiar with the concepts and command line tools involved with connecting to the internet using modern 4G LTE modems on both Debian/Ubuntu and OpenWRT.

This writeup is based on my experiences with the Sierra Wireless AirPrime MC7455 modem and a Calyx (Sprint) SIM card, but it should apply to most modern 4G LTE modems.

High level overview

These are the steps required:

Physically connect antennas

This is free and unencumbered software released into the public domain.

Anyone is free to copy, modify, publish, use, compile, sell, or distribute this software, either in source code form or as a compiled binary, for any purpose, commercial or non-commercial, and by any means.

In jurisdictions that recognize copyright laws, the author or authors of this software dedicate any and all copyright interest in the software to the public domain. We make this dedication for the benefit

	#!/usr/bin/env bash
	{ set +x; } 2>/dev/null

	IFS=$'\n'
	set "$@" $(find ~ -name ".*" ! -name ".CFUserTextEncoding" ! -type l -mindepth 1 -maxdepth 1) # dotfiles
	set "$@" $(find ~ -name "Google *" -mindepth 1 -maxdepth 1) # Google Drive
	set "$@" ~/git # store on github/etc :)
	set "$@" ~/node_modules

	set "$@" ~/Applications # install apps with brew cask

	# I recently needed to automate the process of spinning up Windows EC2 instances
	# in AWS, installing ZeroTier, and then joining them to a ZeroTier network. I
	# used Terraform to do this. This example might help others. If you provide an
	# existing subnet, security group, ZeroTier network ID, and a few other details
	# via Terraform variables, this template will create one demo Windows instance
	# in AWS, install ZeroTier, and join the instance to the specified ZeroTier
	# network.

	variable "aws_region" {
	description = "AWS Region where this instance will be deployed (ie: us-east-1)"

	// Render any jsonnet value (except functions) to TOML format.

	local
	inlineTable(body) =
	"{" +
	std.join(", ", ["%s = %s" % [escapeKeyToml(k), renderBody(body[k])] for k in std.objectFields(body)]) +
	"}",

	renderArray(body) =
	local

	/*
	* Test program Linux RS485-mode ioctls.
	*
	* cc -o rs485_mode rs485_mode.c
	*/

	#include <stdlib.h>
	#include <stdio.h>
	#include <sys/types.h>
	#include <sys/stat.h>

	###
	###
	### UPDATE: For Win 11, I recommend using this tool in place of this script:
	### https://christitus.com/windows-tool/
	### https://github.com/ChrisTitusTech/winutil
	### https://www.youtube.com/watch?v=6UQZ5oQg8XA
	### iwr -useb https://christitus.com/win \| iex
	###
	###