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@mahmoudimus
mahmoudimus / attributes.rb
Created Apr 21, 2019 — forked from lizthegrey/attributes.rb
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'
@mahmoudimus
mahmoudimus / mac-files.md
Last active Mar 31, 2019
fix up mac reinstall
View mac-files.md

I purchased a new Macbook and I restored my files from another mac via migration assistant.

As I was using Brew, I saw a lot of errors such as:

Upgrading railwaycat/emacsmacport/emacs-mac --with-natural-title-bar
Error: An exception occurred within a child process:
  RuntimeError: /usr/local/opt/libevent not present or broken
Please reinstall libevent. Sorry :(
@mahmoudimus
mahmoudimus / README.md
Created Mar 30, 2019 — forked from valyala/README.md
Optimizing postgresql table for more than 100K inserts per second
View README.md

Optimizing postgresql table for more than 100K inserts per second

  • Create UNLOGGED table. This reduces the amount of data written to persistent storage by up to 2x.
  • Set WITH (autovacuum_enabled=false) on the table. This saves CPU time and IO bandwidth on useless vacuuming of the table (since we never DELETE or UPDATE the table).
  • Insert rows with COPY FROM STDIN. This is the fastest possible approach to insert rows into table.
  • Minimize the number of indexes in the table, since they slow down inserts. Usually an index on time timestamp with time zone is enough.
  • Add synchronous_commit = off to postgresql.conf.
  • Use table inheritance for fast removal of old data:
View growth_accounting_and_ltv.sql
with
dau as (
-- This part of the query can be pretty much anything.
-- The only requirement is that it have three columns:
-- dt, user_id, inc_amt
-- Where dt is a date and user_id is some unique identifier for a user.
-- Each dt-user_id pair should be unique in this table.
-- inc_amt represents the amount of value that this user created on dt.
-- The most common case is
-- inc_amt = incremental revenue from the user on dt
View kotlin-annoyances.md

Kotlin Annoyances

These are things that I found annoying writing a complex library in Kotlin. While I am also a Scala developer, these should not necessarily be juxtaposed w/ Scala (even if I reference Scala) as some of my annoyances are with features that Scala doesn't even have. This is also not trying to be opinionated on whether Kotlin is good/bad (for the record, I think it's good). I have numbered them for easy reference. I can give examples for anything I am talking about below upon request. I'm sure there are good reasons for all of them.

  1. Arrays in data classes break equals/hashCode and ask you to overload it. If you are going to need to overload it and arrays have no overridability, why not make the least-often use case (the identity-comparison equals) the exception?
@mahmoudimus
mahmoudimus / example-subtree-usage.md
Created Jan 29, 2019 — forked from kvnsmth/example-subtree-usage.md
A real world usage for git subtrees.
View example-subtree-usage.md

Let's say you have an iOS project, and you want to use some external library, like AFNetworking. How do you integrate it?

With submodules

Add the project to your repo:

git submodule add git@github.com:AFNetworking/AFNetworking.git Vendor/AFNetworking

or something to that effect.

@mahmoudimus
mahmoudimus / wsgi.py
Created Jan 29, 2019 — forked from LeZuse/wsgi.py
WSGI script with virtualenv activation with Flask
View wsgi.py
import os
import sys
# Install venv by `virtualenv --distribute venv`
# Then install depedencies: `source venv/bin/active`
# `pip install -r requirements.txt`
activate_this = '/var/www/apache/csshat.com/csshat.com/venv/bin/activate_this.py'
execfile(activate_this, dict(__file__=activate_this))
path = os.path.join(os.path.dirname(__file__), os.pardir)
@mahmoudimus
mahmoudimus / export-device-hrefs.js
Last active Jan 14, 2019
Exports the history from Google Chrome's syncedTabs in chrome://history/syncedTabs
View export-device-hrefs.js
/*
1. Go to chrome://history/syncedTabs
2. Open up the console
3. Copy & paste the script below into the console
4. Profit
*/
const history = document.querySelector("#history-app").shadowRoot;
const main = (history.querySelector("#main-container > iron-pages#content > history-synced-device-manager#synced-devices")
.root.querySelector("div#synced-device-list > history-synced-device-card"));
@mahmoudimus
mahmoudimus / emacs_daemon.scpt
Created Dec 10, 2018 — forked from dlukes/emacs_daemon.scpt
AppleScript wrapper app around Emacs for running it conveniently as a daemon on OS X
View emacs_daemon.scpt
(* SETUP
1. Create an Application in Automator.
2. Add a Run AppleScript action.
3. Paste the content of this gist instead of the provided script skeleton.
4. Save the app, drag it to your dock and/or set it as the default app for
the filetypes of your choice using the Open With dialog in Finder.
NOTES ON USAGE
@mahmoudimus
mahmoudimus / emacs-loader
Created Dec 10, 2018 — forked from hadongsoo/emacs-loader
emacs for daemon
View emacs-loader
tell application "Terminal"
try
-- we look for <= 2 because Emacs --daemon seems to always have an entry in visibile-frame-list even if there isn't
set frameVisible to do shell script "/Applications/Emacs.app/Contents/MacOS/bin/emacsclient -e '(<= 2 (length (visible-frame-list)))'"
if frameVisible is not "t" then
-- there is a not a visible frame, launch one
do shell script "/Applications/Emacs.app/Contents/MacOS/bin/emacsclient -c -n"
end if
on error
-- daemon is not running, start the daemon and open a frame
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