Eduardo Cortecione Gouvea ecgouvea

A curated list of AWS resources to prepare for the AWS Certifications

A curated list of awesome AWS resources you need to prepare for the all 5 AWS Certifications. This gist will include: open source repos, blogs & blogposts, ebooks, PDF, whitepapers, video courses, free lecture, slides, sample test and many other resources.

Client-side SSL

For excessively paranoid client authentication.

Updated Apr 5 2019:

because this is a gist from 2011 that people stumble into and maybe you should AES instead of 3DES in the year of our lord 2019.

some other notes:

	# I recently had to try to update the TZDB of a JDK installation where I could not install lzip
	# from any registered package repository and trying to compile lzip from source was failing.
	# I discovered that as an alternative to using the tzdb-latest.tar.lz file I could just use both
	# the tzcode-latest.tar.gz and the tzdata-latest.tar.gz to generate the needed rearguard tarballs.
	# These instructions have been updated to no longer rely on lzip since it's not available out of
	# the box in many environments.

	# SHORTCUT ALERT: If you don't want to go through the whole process to build the rearguard tarball
	# or use the ziupdater tool to generate and install a tzdb.dat file you can always just download
	# the latest tar.gz and tzdb.dat files from a repo I created that automatically builds new TZDB

	$path = ".\.vagrant\machines\default\hyperv\private_key"
	icacls.exe $path /reset
	icacls.exe $path /GRANT:R "$($env:USERNAME):(R)"
	icacls.exe $path /inheritance:r

	# Source: https://stackoverflow.com/a/43317244
	$path = ".\aws-ec2-key.pem"
	# Reset to remove explict permissions
	icacls.exe $path /reset
	# Give current user explicit read-permission
	icacls.exe $path /GRANT:R "$($env:USERNAME):(R)"
	# Disable inheritance and remove inherited permissions
	icacls.exe $path /inheritance:r

	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

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	[color "branch"]
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	local = yellow
	remote = green
	[color "diff"]
	meta = yellow bold
	frag = magenta bold
	old = red bold