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@dmitshur
dmitshur / main.go
Last active Mar 16, 2020
A simple server for HTTPS and HTTP protocols.
View main.go
// A simple server for HTTPS and HTTP protocols. It implements these behaviors:
//
// • uses Let's Encrypt to acquire and automatically refresh HTTPS certificates
//
// • redirects HTTPS requests to canonical hosts, reverse proxies requests to internal backing servers
//
// • redirects all HTTP requests to HTTPS
//
// • gates certain endpoints with basic auth, using bcrypt-hashed passwords
//
@lizthegrey
lizthegrey / attributes.rb
Last active Mar 8, 2021
Hardening SSH with 2fa
View attributes.rb
default['sshd']['sshd_config']['AuthenticationMethods'] = 'publickey,keyboard-interactive:pam'
default['sshd']['sshd_config']['ChallengeResponseAuthentication'] = 'yes'
default['sshd']['sshd_config']['PasswordAuthentication'] = 'no'
@hellerbarde
hellerbarde / latency.markdown
Created May 31, 2012 — forked from jboner/latency.txt
Latency numbers every programmer should know
View latency.markdown

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