John Smith jiayulu

GPG / Mutt / Gmail

About

This is a collection of snippets, not a comprehensive guide. I suggest you start with Operational PGP.

Here is an incomplete list of things that are different from other approaches:

I don't use keyservers. Ever.
Yes, I use Gmail instead of some bespoke hipster freedom service

GPG / Mutt / Gmail

About

This is a collection of snippets, not a comprehensive guide. I suggest you start with Operational PGP.

Here is an incomplete list of things that are different from other approaches:

I don't use keyservers. Ever.
Yes, I use Gmail instead of some bespoke hipster freedom service

How to passthrough SATA drives directly on VMWare EXSI 6.5 as RDMs

There aren't many tutorials about this, the only tutorials I've found were about passing through entire PCIe cards to VMs, or refered to old ESXI versions (below 6.5) that used a more comprehensive desktop client instead of the web app. In v6.5, the web app was introduced and the desktop client was deprecated. You used to be able to setup RDMs in the desktop client, but with the introduction of the web console, this is no longer the case. This tutorial shows you how to pass SATA HDDs to the virtual machine on VMWare ESXI 6.5. This tutorial is partially based on VMWare's own KB and the now deprecated Forza IT blog post.

Summary

We attach the SATA HDDs as a RDM (Raw Device Mapper) into an existing virtual disk in the command line, then on the web app

Exposing your clipboard over SSH

I frequently administer remote servers over SSH, and need to copy data to my clipboard. If the text I want to copy all fits on one screen, then I simply select it with my mouse and press CMD-C, which asks relies on m y terminal emulator (xterm2) to throw it to the clipboard.

This isn't practical for larger texts, like when I want to copy the whole contents of a file.

If I had been editing large-file.txt locally, I could easily copy its contents by using the pbcopy command:

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

Clarify and agree on the scope of the system

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

	# -- coding: utf-8 --
	# To list this file sections: $ grep '^"" ' notes.py

	"""""""""""""
	"" Why Python ?
	"""""""""""""
	- extremely readable (cf. zen of Python + [this 2013 study](http://redmonk.com/dberkholz/2013/03/25/programming-languages-ranked-by-expressiveness/))
	- simple & fast to write
	- very popular (taught in many universities)
	- has an extremely active development community

	(defun dotspacemacs/user-config ()
	(setq shell-file-name "/bin/bash")

	; set default var lang_source for ibus arg
	(setq lang_source "xkb:us::eng")

	; what we do when enter insert mode
	(add-hook 'evil-insert-state-entry-hook
	(lambda ()
	(shell-command (concat "ibus engine " lang_source))))

	Latency Comparison Numbers (~2012)
	----------------------------------
	L1 cache reference 0.5 ns
	Branch mispredict 5 ns
	L2 cache reference 7 ns 14x L1 cache
	Mutex lock/unlock 25 ns
	Main memory reference 100 ns 20x L2 cache, 200x L1 cache
	Compress 1K bytes with Zippy 3,000 ns 3 us
	Send 1K bytes over 1 Gbps network 10,000 ns 10 us
	Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD

	<?xml version="1.0" encoding="UTF-8"?>
	<Response>
	<SpeakSentence gender="male" locale="en_US" voice="paul">Thank you for calling Tom's Tire Shop</SpeakSentence>
	<Transfer transferCallerId="+19198281234">
	<PhoneNumber>+19198281235</PhoneNumber>
	<PhoneNumber>+19198281236</PhoneNumber>
	<PhoneNumber>sip:[email protected]</PhoneNumber>
	</Transfer>
	</Response>

	#!/bin/bash

	#[remind_break]
	#command=~/.i3/i3blocks/take-a-break.sh
	#interval=10

	# Minutes
	work_time=20
	break_time=5