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• Archives
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• Links to CSS colour palettes
• Testing Vue components in the browser
• Examples for the tcpdump and dig man pages
• Notes on clarifying man pages
• Some notes on starting to use Django
• A data model for Git (and other docs updates)
• Notes on switching to Helix from vim
• New zine: The Secret Rules of the Terminal
• Using `make` to compile C programs (for non-C-programmers)
• Standards for ANSI escape codes
• popular posts
• Uncategorized
• Cool computer tools / features / ideas
• Some Go web dev notes
• Reasons I still love the fish shell
• What helps people get comfortable on the command line?
• Lima: a nice way to run Linux VMs on Mac
• Monitoring tiny web services
• Notes on running containers with bubblewrap
• sqlite-utils: a nice way to import data into SQLite for analysis
• A list of new(ish) command line tools
• Things that used to be hard and are now easy
• Hosting my static sites with nginx
• Some notes on using esbuild
• Firecracker: start a VM in less than a second
• Server-sent events: a simple way to stream events from a server
• Docker Compose: a nice way to set up a dev environment
• ninja: a simple way to do builds
• Implementing 'focus and reply' for Fastmail with JMAP
• scanimage: scan from the command line!
• entr: rerun your build when files change
• PaperWM: tiled window management for GNOME
• SQLite is really easy to compile
• Why are monoidal categories interesting?
• Tailwind: style your site without writing any CSS!
• An awesome new Python profiler: py-spy!
• Batch editing files with ed
• Glitch: write fun small web projects instantly
• Binder: an awesome tool for hosting Jupyter notebooks
• Cool vim feature: sessions!
• Data structure: the treap!
• a tiny whack-a-mole game
• Log-structured storage
• Using the Strict-Transport-Security header
• The fish shell is awesome
• homu + highfive: awesome bots that make open source projects easier
• you can take the derivative of a regular expression?!
• tcpdump is amazing
• How to measure your CPU time: clock_gettime!
• Fast integer sets with Roaring Bitmaps (and, making friends with your modern CPU)
• Sendfile (a system call for web developers to know about!)
• PAPERS ARE AMAZING: Profiling threaded programs with Coz
• LD_PRELOAD is super fun. And easy!
• Things I built
• Using less memory to look up IP addresses in Mess With DNS
• Migrating Mess With DNS to use PowerDNS
• Mounting git commits as folders with NFS
• Open sourcing the nginx playground
• New playground: memory spy
• Introducing "Implement DNS in a Weekend"
• New playground: integer.exposed
• A list of programming playgrounds
• Some tiny personal programs I've written
• New tool: Mess with DNS!
• New tool: an nginx playground
• Notes on building debugging puzzles
• A tool to spy on your DNS queries: dnspeep
• A little tool to make DNS queries
• Git
• Notes on git's error messages
• Some Git poll results
• The "current branch" in git
• How HEAD works in git
• Popular git config options
• Dealing with diverged git branches
• Inside .git
• Do we think of git commits as diffs, snapshots, and/or histories?
• git branches: intuition & reality
• How git cherry-pick and revert use 3-way merge
• git rebase: what can go wrong?
• Confusing git terminology
• Some miscellaneous git facts
• In a git repository, where do your files live?
• Nix
• Some notes on NixOS
• Some notes on nix flakes
• How do Nix builds work?
• Some notes on using nix
• DNS
• Why is DNS still hard to learn?
• Making a DNS query in Ruby from scratch
• Why do domain names sometimes end with a dot?
• The multiple meanings of "nameserver" and "DNS resolver"
• A toy DNS resolver
• Some ways DNS can break
• Why might you run your own DNS server?
• DNS "propagation" is actually caches expiring
• What happens when you update your DNS?
• Terminals
• How to add a directory to your PATH
• Some terminal frustrations
• What's involved in getting a "modern" terminal setup?
• "Rules" that terminal programs follow
• Why pipes sometimes get "stuck": buffering
• ASCII control characters in my terminal
• Terminal colours are tricky
• Entering text in the terminal is complicated
• Reasons to use your shell's job control
• What happens when you press a key in your terminal?
• Computer networking
• How to send raw network packets in Python with tun/tap
• A toy remote login server
• Reasons for servers to support IPv6
• How to put an HTML page on the internet
• Networking tool comics!
• An example of how C++ destructors are useful in Envoy
• Some Envoy basics
• Editing my blog's HTTP headers with Cloudflare workers
• IP addresses & routing
• netdev day 2: moving away from "as fast as possible" in networking code
• netdev day 1: IPsec!
• How I use Wireshark
• A few things I've learned about computer networking
• Finding out if/why a server is dropping packets
• What's a network interface?
• Iptables basics
• netdev conference, day 3
• netdev conference, day 2
• How to filter packets super fast: XDP & eBPF!
• netdev conference, day 1
• Slow down your internet with tc
• How big can a packet get?
• Dissecting an SSL certificate
• What's interesting about UDP?
• Why do UDP packets get dropped?
• How do HTTP requests get sent to the right place?
• Why do we use the Linux kernel's TCP stack?
• What are SSL ciphers & session keys?
• CDNs aren't just for caching
• How a computer thing works
• Go structs are copied on assignment (and other things about Go I'd missed)
• Notes on using a single-person Mastodon server
• Behind "Hello World" on Linux
• Implementing a toy version of TLS 1.3
• How to use undocumented web APIs
• Some things about getaddrinfo that surprised me
• How to find a domain's authoritative nameservers
• How to use dig
• How do you tell if a problem is caused by DNS?
• Tools to explore BGP
• Quadratic algorithms are slow (and hashmaps are fast)
• How to look at the stack with gdb
• The OSI model doesn't map well to TCP/IP
• Why strace doesn't work in Docker
• Getting started with shaders: signed distance functions!
• "server" is hard to define
• How tracking pixels work
• How containers work: overlayfs
• SQL queries don't start with SELECT
• How does gdb call functions?
• How do groups work on Linux?
• Async IO on Linux: select, poll, and epoll
• Weird unix thing: 'cd //'
• What happens when you start a process on Linux?
• How does gdb work?
• Should you be scared of Unix signals?
• I conquered thread pools! For today, at least.
• Thread pools! How do I use them?
• What is "the stack"?
• Why Ruby’s Timeout is dangerous (and Thread.raise is terrifying)
• Why you should understand (a little) about TCP
• How the locate command works (and let's write a faster version in one minute!)
• How gzip uses Huffman coding
• Diving into concurrency: trying out mutexes and atomics
• How does SQLite work? Part 2: btrees! (or: disk seeks are slow don't do them!)
• How does SQLite work? Part 1: pages!
• How is a binary executable organized? Let's explore it!
• What happens if you write a TCP stack in Python?
• Diving into HDFS
• Three steps to learning GDB
• binary representations of things
• Some possible reasons for 8-bit bytes
• Why does 0.1 + 0.2 = 0.30000000000000004?
• Examples of problems with integers
• Examples of floating point problems
• Javascript
• Importing a frontend Javascript library without a build system
• Writing Javascript without a build system
• A little bit of plain Javascript can do a lot
• Kubernetes / containers
• Operating a Kubernetes network
• Reasons Kubernetes is cool
• How Kubernetes certificate authorities work
• Cherry picking commits & shell scripting in golang
• How does the Kubernetes scheduler work?
• A few things I've learned about Kubernetes
• Swapping, memory limits, and cgroups
• A container networking overview
• What happens when you run a rkt container?
• Running containers without Docker
• What even is a container: namespaces and cgroups
• A list of Linux container software
• "I just want to run a container!"
• Some questions about Docker and rkt
• Docker is amazing
• Zines / comics
• New zine: How Git Works!
• New zine: How Integers and Floats Work
• Print copies of The Pocket Guide to Debugging have arrived
• New zine: The Pocket Guide to Debugging
• Pages that didn't make it into "How DNS Works"
• New zine: How DNS Works!
• All my zines are now available in print!
• You can now buy print version of my zines!
• I put all of my comics online!
• New zine: Hell Yes! CSS!
• Wizard Zines' first print run: Help! I have a Manager!
• Some more CSS comics
• Some CSS comics
• New zine: How Containers Work!
• New zine: Become a SELECT Star!
• Your Linux Toolbox: a box set of my free zines
• New zine: HTTP: Learn your browser's language!
• New zine: Bite Size Networking!
• New zine: Oh shit, git!
• New zine: Help! I have a manager!
• New zine: Bite Size Command Line!
• New zine: Profiling & tracing with perf!!
• New zine: So you want to be a wizard
• Linux comics: a small zine
• Linux tracing zine
• "Let's learn tcpdump" zine: now available for everyone
• New zine: let's learn tcpdump!
• New zine: "Networking! ACK!"
• A tiny zine about machine learning
• More drawings about computers
• A few drawings about Linux
• New zine: Linux debugging tools you'll love
• A few sketches
• A zine about strace
• Exercises
• Questions to help people decide what to learn
• Challenge: find Twitter memes with suffix arrays
• Solutions to the tiny window manager challenge
• Challenge: Write a bouncy window manager
• What makes a programming exercise good?
• Notes on building SQL exercises
• git exercises: navigate a repository
• curl exercises
• On writing words
• Some tactics for writing in public
• Some blogging myths
• Teaching by filling in knowledge gaps
• Patterns in confusing explanations
• Write good examples by starting with real code
• On writing comics / zines
• Building a custom site for zine feedback
• How I write useful programming comics
• A new way I'm getting feedback on my zines: beta readers!
• Some possible future zines
• An attempt to make a font look more handwritten
• Some notes on vector drawing apps
• Some research on shipping print zines
• Zine revenue for 2019
• Taking a year to explain computer things
• How to write zines with simple tools
• How do you document a tech project with comics?
• When does teaching with comics work well?
• Why sell zines?
• How to teach technical concepts with cartoons
• Handwritten books
• An idea for a programming book
• Why cute drawings?
• How (and why) I made a zine
• Conferences
• !!Con 2019: submit a talk!
• Systems We Love 2016
• PolyConf 2016
• Women in Machine Learning 2015 (fun!!!)
• AdaCamp Montreal 2015
• Data Day Texas 2015
• PyData NYC (I gave a machine learning talk! yay!)
• Strange Loop 2014
• !!Con talks are up
• ♥ PyCon
• CUSEC = fun
• PyData Boston 2013
• Open Data Exchange 2013
• Montreal All-Girl Hack Night #2: now with cookies
• Montreal All-Girl Hack Night #1: AMAZING
• Organizing conferences
• Ideas for making better conference talks & conferences
• You can choose who submits talks to your conference
• Should my conference do anonymous review?
• Anonymous talk review is amazing.
• Businesses / marketing
• A few things I've learned about email marketing
• saturday comics: a weekly mailing list of programming comics
• A few early marketing thoughts
• Who pays to educate developers?
• I started a corporation!
• Statistics / machine learning / data analysis
• An attempt at implementing char-rnn with PyTorch
• Some nonparametric statistics math
• Some good "Statistics for programmers" resources
• How do these "neural network style transfer" tools work?
• A few reasons to be skeptical of machine learning
• Looking inside machine learning black boxes
• Winning the bias-variance tradeoff
• How to trick a neural network into thinking a panda is a vulture
• Is machine learning safe to use?
• Some easy statistics: Bootstrap confidence intervals
• A/A testing
• Fun with machine learning: logistic regression!
• Fun with machine learning: does your model actually work?
• Fun with stats: How big of a sample size do I need?
• Machine learning isn't Kaggle competitions
• A pandas cookbook
• Graphing bike path data with IPython Notebook and pandas
• Year in review
• 2023: Year in review
• Some business graphs for 2022
• 2021: Year in review
• 2020: Year in review
• 2019: Year in review
• 2018: Year in review
• 2017: Year in review
• 2016: Year in review
• 2015: Year in review
• Talks
• New talk: Making Hard Things Easy
• New talk: Learning DNS in 10 years
• New talk: High Reliability Infrastructure Migrations
• Build impossible programs
• So you want to be a wizard
• Infrastructure / operations engineering
• Some notes on running new software in production
• What can developers learn from being on call?
• Bash scripting quirks & safety tips
• Ideas about how to use AWS
• Service discovery at Stripe
• Consistency vs availability (wat?)
• What's devops?
• Operations for software developers for beginners
• How do you do capacity planning?
• Why I love log files
• TIL: clock skew exists
• Fear makes you a worse programmer
• Career / work
• Get better at programming by learning how things work
• Things your manager might not know
• When your coworker does great work, tell their manager
• Tell candidates what to expect from your job interviews
• Questions you can ask about compensation
• Get your work recognized: write a brag document
• What's a senior engineer's job?
• Some possible career goals
• Open source sabbatical = awesome
• Writing performance reviews with positive constructive feedback
• Taking a sabbatical to work on Ruby profiling tools
• Telling people what you're working on
• Writing down my career
• Hiring & opportunity
• Choosing the "best software"
• Getting things done
• How I got a CS degree without learning what a system call is
• Release it, then build it
• How do you decide what to work on?
• Three ways to solve hard programming problems
• Talking about stock options = awesome
• Things you should know about stock options before negotiating an offer
• 1:1 topic ideas
• How I learned to program in 10 years
• Stopping to think
• Becoming a better developer (it's not just writing more programs)
• Sounding confident in interviews
• What my technical interviews have looked like
• Questions I'm asking in interviews
• Working with others / communication
• Making small culture changes
• How do you make an awesome team?
• Learning to like design documents
• Senior engineering & fantasy heroes
• On reading the source code, not the docs
• Pair programming is amazing! Except... when it's not.
• Pair programming
• Remote work
• Working remotely, 4 years in
• Surviving meetings while remote
• Working remote, 8 months in (seeing humans is important!)
• Working remote, 3 months in
• Reports from remote-land: remote pairing works great!
• Talks transcripts / podcasts
• A few recent podcasts
• Talk: Building a Ruby profiler
• How does the internet work? podcast
• A swiss army knife of debugging tools: talk & transcript
• Notes from my PyData Berlin keynote
• A few notes on my CUSEC talk
• Ruby Rogues podcast: systems programming tricks!
• On blogging / speaking
• New microblog with TILs
• Some notes on upgrading Hugo
• Blog about what you've struggled with
• Metaphors in man pages
• Organizing this blog into categories
• Talks I'd love to see at RustConf
• Measuring a blog's success: focus on conversations, not page views
• How I set up an automatic weekly blog digest
• Blogging principles I use
• Switching to Hugo
• "advice" for aspiring tech bloggers
• Reproducing awesomeness
• How to set up a blog in 5 minutes
• Open sourced talks!
• You should give talks. They will be awesome. Here's why!
• Trying out Octopress
• On learning
• Celebrate tiny learning milestones
• How to get useful answers to your questions
• How to teach yourself hard things
• How to answer questions in a helpful way
• Learning at work
• Rules of programming experiments
• How to ask good questions
• Asking good questions is hard (but worth it)
• How does knowledge get locked up in people's heads?
• Asking questions is a superpower
• "Ask if you have questions" isn't enough
• Rust
• A couple of Rust error messages
• Rust in 2018: it's way easier to use!
• My first Rust macro
• Debugging a segfault in my Rust program
• Bindgen: awesome Rust tool for generating C bindings
• What's a reference in Rust?
• Learning systems programming with Rust
• A second try at using Rust
• Calling C from Rust
• Why I ❤ Rust
• My Rust OS will never be finished (and it's a success!)
• Writing an OS in Rust in tiny steps (Steps 1-5)
• Some things my kernel can't do
• Linux debugging / tracing tools
• What problems do people solve with strace?
• A perf cheat sheet
• Linux tracing systems & how they fit together
• Notes on BPF & eBPF
• 3 short screencasts (/proc, tcpdump, strace)
• ftrace: trace your kernel functions!
• Linux debugging tools I love
• Using ltrace to debug a memory leak
• A useful new strace feature
• A workshop on strace & tcpdump
• How does perf work? (in which we read the Linux kernel source)
• perf top: an awesome way to spy on CPU usage
• A few spy tools for your operating system (other than strace!)
• Seeing system calls with perf instead of strace
• Spying on Hadoop with strace
• I can spy on my CPU cycles with perf!
• Debug your programs like they're closed source!
• Debugging shared library problems with strace
• More practical uses for strace!
• Using strace to avoid reading Ruby code
• Spying on ssh with strace
• Understanding how killall works using strace
• Debugging
• A debugging manifesto
• Tips for analyzing logs
• Some ways to get better at debugging
• Debugging by starting a REPL at a breakpoint is fun
• Reasons why bugs might feel "impossible"
• When debugging, your attitude matters
• What does debugging a program look like?
• How I got better at debugging
• Coding strategies
• Debugging stories
• Debugging a weird 'file not found' error
• Reverse engineering the Notability file format
• Debugging netlink requests
• A small website mystery
• Investigating Erlang by reading its system calls
• Surprises in Ruby HTTP libraries
• Nancy Drew and the Case of the Slow Program
• Fan posts about awesome work by other people
• Awesome NLP tutorials by Allison Parrish
• Like zines about computers? You might love Bubblesort Zines
• A magical machine learning art tool
• "A Critique of the CAP Theorem"
• Some of my favorite blogs
• A few blogs I really like
• Julia Serano's 'Excluded'
• Transit maps: 1941 vs 2011
• Inclusion
• No feigning surprise
• A litmus test for job descriptions
• Women-only spaces are a hack
• An argument for hiring junior developers
• Programming doesn't belong to men (it belongs to me)
• What women in technology really think (150 of them, at least)
• When is "guys" gender neutral? I did a survey!
• not about computers
• Making crochet cacti
• rbspy
• Documentation site for rbspy!
• Prototyping an ltrace clone using eBPF
• Profiler week 6/7: more experiments, and a `report` subcommand!
• Profiler week 5: Mac support, experiments profiling memory allocations
• Writing eBPF tracing tools in Rust
• Spying on a Ruby process's memory allocations with eBPF
• Profiler week 4: callgrind support, containers, Mac progress!
• I think I found a Mac kernel bug?
• How do you spy on a program running in a container?
• How do you read the memory maps of a Mac process?
• Profiler week 3: refactoring, better testing, and an alpha release!
• Profiler week 2: support for 1.9.3 -> 2.5.0, and line numbers!
• Should I pause a Ruby process to collect its stack?
• Profiler adventures: resolving symbol addresses is hard!
• Profiler week 1: testing & profiling stripped binaries
• How are Ruby's headers different from Python's headers?
• How often do Ruby's stack struct definitions change?
• How do Ruby & Python profilers work?
• How to spy on a Ruby program
• Performance
• Profiling Go programs with pprof
• How much memory is my process using?
• Benchmarking correctly is hard (and techniques for doing it better)
• The Etsy site performance report is amazing
• Some links on Java garbage collection
• Java garbage collection can be really slow
• I/O matters.
• Have high expectations for your computers
• How CPU load averages work (and using them to triage webserver performance!)
• Java isn't slow
• A millisecond isn't fast (and how we made it 100x faster)
• Computers are *fast*!
• Open source
• Figuring out how to contribute to open source
• A few questions about open source
• Learning at open source sprints (no preparation required)
• Don't feel guilty about not contributing to open source
• Linux systems stuff
• How to get a core dump for a segfault on Linux
• Things to learn about Linux
• Guessing Linux kernel registers
• You can be a kernel hacker!
• Recovering files using /proc (and spying, too!)
• 4 paths to being a kernel hacker
• Recurse Center 2020
• Day 57: Trying to set up GitHub Actions
• Day 56: A little WebAssembly
• Day 53: a little nginx, IPv6, and wireguard
• Day 52: testing how many Firecracker VMs I can run
• Day 51: Fixed my logging and made a couple of puzzles
• Day 50: Building some tarballs for puzzles, and trying to make a kernel boot faster
• Day 49: making the VMs boot faster
• Day 48: Another Go program, and a little vim configuration
• Day 47: Using device mapper to manage Firecracker images
• Day 46: debugging an iptables problem
• Day 44: Building my VMs with Docker
• Day 43: Building VM images
• Day 42: Writing a Go program to manage Firecracker VMs
• Day 41: Trying to understand what a bridge is
• Day 40: screen flickering & a talk about containers
• Day 39: Customizing gotty's terminal
• Day 38: Modifying gotty to serve many different terminal applications at once
• Day 37: A new laptop and a little Vue
• Day 35: Launching my VMs more reliably
• Daily blog posts about my time at RC
• Day 34: Learning about qemu
• Day 33: pairing is magic and beautiful git diffs
• Day 32: A Rails model that doesn't use the database with ActiveHash
• Day 24: a short talk about blogging myths, and a debugging tip
• Day 23: a little Rails testing
• Day 22: getting OAuth to work in Rails
• Day 21: wrangling systemd & setting up git deploys to a VM
• Day 19: Clustering faces (poorly) using an autoencoder
• Day 20: trying to figure out how Google Cloud IAM works
• Day 18: an answer to an autoencoder question
• Day 17: trying to wrap my head around autoencoders
• Day 13: BPTT, and debugging why a model isn't training is hard
• Day 11: learning about learning rates
• Day 10: Training an RNN to count to three
• Day 9: Generating a lot of nonsense with an RNN
• Day 8: Start with something that works
• Day 5: drawing lots of faces with sketch-rnn
• How do you write simple explanations without sounding condescending?
• Day 3: an infinitely tall fridge
• Day 2: Rails associations & dragging divs around
• Day 1: a confusing Rails error message
• I'm doing another Recurse Center batch!
• Recurse Center 2013
• How I spent my time at the Recurse Center
• How I did Hacker School: ignoring things I understand and doing the impossible
• Hacker School's Secret Strategy for Being Super Productive (or: Help.)
• "How was Hacker School?"
• Day 46: Never Graduate
• Day 45: I now have Rust code for executing executables!
• Day 44: qemu + gdb = so great
• Day 43: SOMETHING IS ERASING MY PROGRAM WHILE IT’S RUNNING (oh wait oops)
• Day 42: How to run a simple ELF executable, from scratch (I don't know)
• Day 41: Linkers are upsetting
• Day 39: Writing malloc wrong, for fun
• Day 40: 12 things I learned today about linkers.
• Day 40: Linkers are amazing.
• Day 38: After 6 days, I have problems that I can't understand at all
• Day 37: After 5 days, my OS doesn't crash when I press a key
• Day 36: On programming without malloc
• Day 35: Types in Rust, for beginners
• How to call Rust from assembly, and vice versa
• Videos from PyData NYC are up!
• What happens when you run 'Hello, world'
• Writing a kernel using rustboot & rust-core
• Day 34b: Writing curl using my TCP stack
• Day 34: The tiniest operating system
• Day 33: How to make music with ClojureScript
• Day 32: Magical Orchestra!!!
• Day 31: Binary trees with core.logic!
• Day 30: Making music in Clojure with Overtone. Clojure bugs with laziness! Fun!
• Day 29: Trying out Emacs!
• Day 28: Made a git workflow visualization webapp!
• Day 27: Automatically testing changes in state! Visualizing my Git workflow! Floats!
• Day 25: ACK all the things
• Day 26: Trying to describe the TCP state machine in a readable way. Failing.
• Women in Technology workshop at PyData NYC
• Day 24: Unit testing this TCP library
• Day 22: Got some TCP packets back!
• Day 23: Started writing a TCP stack in Python
• NYC Python talk
• Day 21: Trying to TCP
• Day 19: A few reasons why networking is hard
• Day 20: Traceroute in 15 lines of code using Scapy
• Day 18: ARP cache poisoning (or: In ur connection, sniffing ur packets)
• Day 17: How to write a buffer overflow exploit
• Day 16: gzip + poetry = awesome
• Do Rails programmers use node.js? Visualizing correlations in command usage
• Day 15: How a .gz file is structured, redux
• Day 14: When it's hard to write tests, that's when I should be testing
• Day 13: Off by one errors
• Day 12: Why Julia likes Julia
• Day 10: Goals. Goals? Maybe I need to be *reading* more code?
• Day 11: How does gzip work?
• Day 9: Bytecode is made of bytes! CPython isn't scary!
• Day 8: Julia writes Julia! And remembers that open source is hard.
• Day 7: An echo server in Clojure
• Day 6: I wrote a rootkit!
• Day 5: I wrote a kernel module!!!
• Where to find bike sharing systems' data feeds
• Day 4: Processes vs threads, and kernel modules!
• Day 3: What does the Linux kernel even do?
• Day 2: netcat fun!
• Day 1: What does a shell even do?
• Hacker School Day 1: Messing around with the stack in C
• Hacker School Day -4: unit testing in C. checkmk!
• blogs I love
• books I've read
• (my posts about it)

• Github
• Wizard Zines
• Ulia Ea
• Recurse Center

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