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🔎Julia Evans🔍 Profile picture
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18 Jan, 4 tweets, 2 min read
does anyone know a clear explanation of **exactly* what happens when you send a packet to 8.8.8.8 from a docker container? (i *think* the packet goes out through the veth pair, gets SNAT-ed, and comes back through the docker0 bridge but I'm very confused about it)
found this great blog post thanks to @vaijab that shows how to trace a packet's journey with `perf trace` and I'm so happy right now blog.yadutaf.fr/2017/07/28/tra… Image
also I think this post by @iximiuz is the clearest explanation of container networking I've ever read (though it still doesn't feel simple to me :) ) iximiuz.com/en/posts/conta…
wrote up some notes on my attempts to understand how to use a bridge yesterday. some of it is probably wrong. jvns.ca/blog/2021/01/1…

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More from @b0rk

🔎Julia Evans🔍 Profile picture
27 Dec 20
welcome! here's a short thread explaining what's going on with the programming comics I post, like this one:
I mostly write about Linux, weird programming languages (like sql / css / bash), debugging, computer networking, and very occasionally people skills

You can read a bunch of my comics here: wizardzines.com/comics/
I run a business called Wizard Zines (wizardzines.com) where I sell short (20-28 page) books (aka "zines") on Linux, Git, HTTP, SQL, bash, CSS, containers, tcpdump, networking, and more
Read 8 tweets
🔎Julia Evans🔍 Profile picture
13 Dec 20
I spent most of October tweeting bash comics, and I’m excited to announce that my “Bite Size Bash” zine is coming out on Wednesday!

here’s a thread with a little bit about why I wrote the zine…
I have a friend who’s a super accomplished senior engineer who mentioned once that they find working on bash scripts really scary and demoralizing.

so, why do really talented programmers struggle with bash?
some problems with bash:

1. It's a weird & counterintuitive language
2. you probably don't need to write it that often, so you don't practice
3. the times you DO need to use it, it's often because something important (like a build) broke and it needs to be fixed RIGHT NOW
Read 7 tweets
🔎Julia Evans🔍 Profile picture
18 Jul 20
inline vs block Image
errata so far:

- at least in firefox, <input> & <button> are inline-block by default, not inline
- the width on a block element defaults to auto, not 100% (though it will often look like it's 100%)
- you can set the width on an inline element if it's a "replaced" element
this "replaced element" thing is really confusing (developer.mozilla.org/en-US/docs/Web…). I did some tests and it seems like in Firefox a textarea is `display: inline` by default, but it's a "replaced element" so you can still set the width in CSS
Read 4 tweets
🔎Julia Evans🔍 Profile picture
26 May 20
I bought "making comics" by Lynda Barry recently and I really love it. the back cover is this invitation to try drawing again Image
the book has a lot of wonderful drawing exercises that aren't about technical precision at all Image
she talks a lot about how the strange characters you draw can surprise you Image
Read 7 tweets
🔎Julia Evans🔍 Profile picture
23 Feb 20
Hello! I want to convince you (yes, you!) to submit a talk to !!Con NYC (May 9-10! NYC!). Our CFP is at bangbangcon.com/give-a-talk.ht….

!!Con accepts LOTS of different kinds of talks from LOTS of different kinds of people so here are some examples of types of talks we've had!
Talk type 1: Software you think is SUPER COOL

Examples of talks like this:

Ayla Myers' "The joys of PICO-8 token crunching!!":

Evy Kassirer's "Reverse engineering your mouth!"
Talk type 2: A fun project you built!

Ahmed Abdalla's "Creating an Arabic Programming Language!"

Kate Beard's "Let’s build a live chat! From the 1800s!"

Sarah Withee's "I Built an Artificial Pancreas!"
Read 10 tweets
🔎Julia Evans🔍 Profile picture
19 Feb 20
an important thing to me about my zine business is that 100% of the revenue comes from people buying zines.

I get asked all the time to write sponsored zines ("hey, could you write a zine about our product") and I always say no -- readers are the customer, not the product.
(which is not to say that sponsorships are bad! Lots of really good education work gets funded through sponsorships. I help organize a conference that we fund largely through sponsorships. It's just not what I do with my zines.)
also please don't reply to this with explanations of other ways I could take money from sponsors. Selling zines to people who want to know stuff is actually a really good business! I don't need extra sponsor income.
Read 5 tweets

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