javouhey

Effective Engineer - Notes

• By Edmond Lau
• Highly Recommended 👍
• http://www.theeffectiveengineer.com/

What's an Effective Engineer?

• They are the people who get things done. Effective Engineers produce results.

Adopt the Right Mindsets

javouhey

These are a subset of the talks that I attended & ones that I enjoyed.
In no particular order:

1. Shipping in Pirate-Infested Waters: Practical Attack and Defense in Kubernetes
   Greg Castle & CJ Cullen, Google
   https://kccncna17.sched.com/event/CU86/shipping-in-pirate-infested-waters-practical-attack-and-defense-in-kubernetes-a-greg-castle-cj-cullen-google

   - The presenters wore hats that matched with the pirate theme.
   - tldr; basic ways to harden your kubernetes cluster. 
   - extra: Google security team (in the Seattle office) is hiring.

javouhey

0x99CD46E14d28B88460334C8c83eD8D987bA64d0e

javouhey

#!/boot/bzImage

# Linux kernel initialization code, translated to bash
# (Minus floppy disk handling, because seriously, it's 2017.)
# Not 100% accurate, but gives you a good idea of how kernel init works
# GPLv2, Copyright 2017 Hector Martin <marcan@marcan.st>
# Based on Linux 4.10-rc2.

# Note: pretend chroot is a builtin and affects the current process
# Note: kernel actually uses major/minor device numbers instead of device name

javouhey

2016-nov-22 - installed https://blog.golang.org/go-fonts in C:\dev\2016\image

javouhey

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

javouhey

#!/usr/bin/env python

import sys, os, time, atexit
from signal import SIGTERM

class Daemon:
    """
    A generic daemon class.

    Usage: subclass the Daemon class and override the run() method

javouhey

Lessons

• http://stackoverflow.com/questions/7148419/subclass-dict-userdict-dict-or-abc
  • To create your custom dicts, avoid UserDict, subclass collections.abc.MutableMapping. #py3x
• https://docs.python.org/dev/library/collections.abc.html #py3x
• http://stackoverflow.com/questions/23305359/why-do-python-have-so-many-ways-to-test-for-a-dictionary-type

reference

• http://www.itmaybeahack.com/book/python-2.6/html/p03/p03c04_extending.html

javouhey

> /home/gavin/dev/gavin/hawkeye/useful/pyhawk/mycode/sample_client.py(53)<module>()->None
-> main()
(Pdb) c
Traceback (most recent call last):
  File "sample_client.py", line 53, in <module>
    main()
  File "sample_client.py", line 33, in main
    res = requests.get(url, data=params, headers=headers)
  File "/home/gavin/dev/gavin/hawkeye/useful/pyhawk/local/lib/python2.7/site-packages/requests/api.py", line 55, in get
    return request('get', url, **kwargs)

javouhey

function goinit {
	export GOROOT=/usr/local/Cellar/go/1.2.1/libexec
	if [ $# -lt 1 ]
	then
		echo "No directories were created."
		export GOPATH=$(pwd -P)
		export PATH=$PATH:$GOPATH:$GOPATH/bin
	else
		echo "$1 being created"
		mkdir $1