MYH myh-st

Create an SSH key in PEM format

I have not been able to use ssh-keygen -e to reliably generate a private key for SSH in PEM format. This format is sometimes used by commercial products. Instead, I had to convert the key using openssl.

# generate an RSA key of size 2048 bits
ssh-keygen -t rsa -b 2048 -f azure -C 'azure-dev'

# copy key to x.x.x.x and add to authorized_keys

Switching between AHCI and RAID on the Dell XPS 15 (9560)

This guide likely applies to other models and, potentially, even laptops from other OEMs that have NVME drives. However, I've only tested this on my Dell XPS 15 (9560) with the OEM Windows installation from the Signature Edition model.

Switching from RAID to AHCI

Switching from RAID to AHCI is significantly simpler than switching from AHCI to RAID. All that's needed is a successful boot to Safe Mode.

To set the default boot mode to Safe Mode, use msconfig.exe or open an admin cmd/PowerShell window and run:

	#!/bin/bash
	# save this file as tailc then
	# run as: $ tailc logs/supplier-matching-worker.log Words_to_highlight
	file=$1

	if [[ -n "$2" ]]; then
	color='
	// {print "\033[37m" $0 "\033[39m"}
	/(WARN\|WARNING)/ {print "\033[1;33m" $0 "\033[0m"}
	/(ERROR\|CRIT)/ {print "\033[1;31m" $0 "\033[0m"}

	user nginx;
	worker_processes auto;
	error_log /var/log/nginx/error.log;
	pid /run/nginx.pid;

	# Load dynamic modules. See /usr/share/nginx/README.dynamic.
	include /usr/share/nginx/modules/*.conf;

	events {
	worker_connections 1024;

	{# style 1 - long form #}
	{% if filepath == '/var/opt/tomcat_1' %}
	{% set tomcat_value = tomcat_1_value %}
	{% else %}
	{% set tomcat_value = tomcat_2_value %}
	{% endif %}

	{# style 2 - short form #}
	{% set tomcat_value = tomcat_1_value if (filepath == '/var/opt/tomcat_1') else tomcat_2_value %}

	# templates/mail_body.j2
	{% for host in play_hosts %}
	The {{ host }} says {{ hostvars[host]['result']['stdout'] }}
	{% endfor %}

	#!/bin/bash
	# bash generate random alphanumeric string
	#

	# bash generate random 32 character alphanumeric string (upper and lowercase) and
	NEW_UUID=$(cat /dev/urandom \| tr -dc 'a-zA-Z0-9' \| fold -w 32 \| head -n 1)

	# bash generate random 32 character alphanumeric string (lowercase only)
	cat /dev/urandom \| tr -dc 'a-zA-Z0-9' \| fold -w 32 \| head -n 1

	#!/bin/bash

	if [[ $# -lt 1 ]]; then
	echo "usage: $0 domain"
	exit 0
	else
	domain=$1
	echo "domain is ${domain}"
	fi

	git fetch --all
	git reset --hard origin/master
	git pull origin master

	---
	- hosts: all
	tasks:
	- name: Get mac addresses of all interfaces except local
	debug:
	msg: "{{ ansible_interfaces \| difference(['lo']) \| map('regex_replace', '^(.*)$', 'ansible_\\1' ) \| map('extract', hostvars[inventory_hostname], 'macaddress') \| list }}"