Victor miclovich

Configure GeoIP for iptables

Important

This setup forces iptables-legacy (not nftables) and installs a custom-built xt_geoip_query tool written in C to properly read modern GeoIP databases (xtables-addons ≥ 3.20). The script does not modify firewall rules automatically; it only echoes recommended examples.

Caution

If you use Docker or containerized services, switching to iptables-legacy can temporarily break container networking. This happens because Docker manages its own NAT and MASQUERADE rules, which can be lost when iptables backends change or modules are reloaded. SEE NOTES BELOW.

React recently introduced an experimental profiler API. This page gives instructions on how to use this API in a production release of your app.

Table of Contents

Profiling in production
- Create React App
- Webpack 4

Profiling in production

React DOM automatically supports profiling in development mode for v16.5+, but since profiling adds some small additional overhead it is opt-in for production mode. This gist explains how to opt-in.

Moved to Shopify/graphql-design-tutorial

This code has now been packaged as a plugin, installable from:

https://www.npmjs.com/package/vuex-superstore

How to recover lost Python source code if it's still resident in-memory

I screwed up using git ("git checkout --" on the wrong file) and managed to delete the code I had just written... but it was still running in a process in a docker container. Here's how I got it back, using https://pypi.python.org/pypi/pyrasite/ and https://pypi.python.org/pypi/uncompyle6

Attach a shell to the docker container

Install GDB (needed by pyrasite)

apt-get update && apt-get install gdb

Status	Type	Env Vars Change	Review App	Ticket
Ready/Hold	Feature/Bug/Tooling/Refactor/Hotfix	Yes/No	Link	Link

⚠️ NOTE: use notes like this to emphasize something about the PR. This could include other PRs this PR is built on top of; new or removed environment variables; reasons for why the PR is on hold; or anything else you would like to draw attention to.

Problem

What problem are you trying to solve?

	# Install IPython: python3 -m pip install ipython

	import IPython
	from traitlets.config import get_config

	cfg = get_config()
	cfg.InteractiveShellEmbed.colors = "Linux" # syntax highlighting
	cfg.InteractiveShellEmbed.confirm_exit = False

	alias interacti IPython.embed(config=cfg)

	#!/usr/bin/env bash

	### Bash Environment Setup
	# http://redsymbol.net/articles/unofficial-bash-strict-mode/
	# https://www.gnu.org/software/bash/manual/html_node/The-Set-Builtin.html
	# set -o xtrace
	set -o errexit
	set -o errtrace
	set -o nounset
	set -o pipefail

	import time
	import redis

	# redis connection
	def get_connection(host="127.0.0.1", port="6379", db=0):
	connection = redis.StrictRedis(host=host, port=port, db=db)
	return connection

	class SlidingWindowCounterRateLimiter(object):

	class MyReactComponent extends Component {
	constructor(props) {
	super(props);
	this.myTestFunction = this.myTestFunction.bind(this);
	}
	myTestFunction(){
	alert("hello")
	}
	render() {
	return (