Darren Holdaway dholdaway

🧠 How to Save Context Tokens When Using Claude Code

This is a personal reference workflow for minimizing token usage while maintaining project continuity across Claude Code (Sonnet 4 with file access).

✅ Setup: Populate `CLAUDE.md`

Claude loads CLAUDE.md automatically at session start.

How to install virtualenv:

Install pip first

sudo apt-get install python3-pip

Then install virtualenv using pip3

sudo pip3 install virtualenv

Docker Swarm Mode Ports

Starting with 1.12 in July 2016, Docker Swarm Mode is a built-in solution with built-in key/value store. Easier to get started, and fewer ports to configure.

Inbound Traffic for Swarm Management

TCP port 2377 for cluster management & raft sync communications
TCP and UDP port 7946 for "control plane" gossip discovery communication between all nodes
UDP port 4789 for "data plane" VXLAN overlay network traffic
IP Protocol 50 (ESP) if you plan on using overlay network with the encryption option

AWS Security Group Example

Command

aws s3api list-buckets --query 'Buckets[*].[Name]' --output text | xargs -I {} bash -c 'if [[ $(aws s3api get-bucket-acl --bucket {} --query '"'"'Grants[?Grantee.URI==`http://acs.amazonaws.com/groups/global/AllUsers` && Permission==`READ`]'"'"' --output text) ]]; then aws s3api put-bucket-acl --acl "private" --bucket {} ; fi'

1. List all of the user's buckets, and output the name, as text.

	using UnityEngine;
	using System.Collections.Generic;

	// Written by Steve Streeting 2017
	// License: CC0 Public Domain http://creativecommons.org/publicdomain/zero/1.0/

	/// <summary>
	/// Component which will flicker a linked light while active by changing its
	/// intensity between the min and max values given. The flickering can be
	/// sharp or smoothed depending on the value of the smoothing parameter.

	# NOTE
	#
	#
	# Use sed on the instance up to replace the INSTANCE_ID and DNS_RESOLVER with the following commands
	#
	####################################################################################################
	# Fetch the private IP for resolving DNS dynamically in nginx
	# We also need to escape the `.` from it for usage in later sed
	#
	# DNS_RESOLVER=`grep nameserver /etc/resolv.conf \| cut -d " " -f2 \| sed 's/\./\\./g'`

	# Rock64 Install (Adjust IPs/Hostnames/DNS to your deployment)

	Disable NetworkManager and DHCP Client

	sudo systemctl stop dhcpcd
	sudo systemctl stop NetworkManager
	sudo systemctl disable dhcpcd
	sudo systemctl disable NetworkManager
	sudo systemctl daemon-reload

	#!/bin/bash

	echo "Container Linux installation script"
	echo "This will install:"
	echo " - Docker Community Edition"
	echo " - Docker Compose"
	echo " - Kubernetes: kubeadm, kubelet and kubectl"
	echo ""

	set -xeo pipefail

	#!/usr/bin/python

	import os
	import subprocess
	import time
	import yaml
	import re

	user_name = os.environ.get("DOCKERHUB_USER")

	#!/bin/sh
	# Install brew
	/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

	# Install the experimental NVIDIA Mac drivers
	# Download from http://www.nvidia.com/download/driverResults.aspx/103826/en-us
	# Install cuDNN v5 for 8.0 RC or use the latest when it's available
	# Register and download from https://developer.nvidia.com/rdp/cudnn-download
	# or this path: https://developer.nvidia.com/rdp/assets/cudnn-8.0-osx-x64-v5.0-ga-tgz
	# extract to the NVIDIA CUDA folder and perform necessary linking