Aaron Loo domanchi

WSL VPN DNS Fix

Problem

On Windows Subsystem for Linux (WSL), I noticed a perculiar thing when I connected to VPN -- the network connections stopped working. This problem was consistent across devices, and based on my SRE experience, I knew that it was probably a DNS problem. I just didn't know how to resolve it.

Then, I came across this thread, which kicked off the appropriate rabbit hole to search in to resolve my long standing problem.

Solution

Bash Functions Return Values

The lame, old way: passing in a global variable, setting it in the function, then unsetting it later on.

#!/bin/bash

function foobar() {
    eval $1="some return value"
}

Installing from local repository

pip install -e <path_to_root_file_with_setup.py>

Installing for a different version of Python

Use pip2.7 (or the like) instead.

Deleting git tags

# Delete tag on remote, before you push
git push origin :refs/tags/<tagname>

# Replace the tag to reference the most recent commit
git tag -fa <tagname>

# Push the tag to remote

Rename selected files using a regular expression

rename 's/\.bak$/.txt/' *.bak

Process Management

Check how long something takes to run

Splunk Queries

I really don't like Splunk documentation. Why is it so hard to find out how to do a certain action? So this is a cheatsheet that I constructed to help me quickly gain knowledge that I need.

Analysis

Events over time

index="my_log"

	#!/bin/python3.6
	import email
	import logging
	import os
	import select
	from io import StringIO
	from socketserver import StreamRequestHandler
	from socketserver import TCPServer
	from socketserver import ThreadingMixIn

	from cmds.base import FlaskView as CmdFlaskView


	class FlaskView(CmdFlaskView):
	route_prefix = '/api'

	@classmethod
	def on_socket_event(cls, event_name):
	"""Registers a listener for websocket events.

	#!/bin/bash

	function main() {
	case $1 in
	a)
	echo "You typed in 'a'!"
	;;

	b \| 'd')
	# This fallthrough operator is introduced in Bash v4.

	@fuzz_lightyear.register_factory('userID')
	def create_biz_user_id():
	return do_some_magic_to_create_business()