Things I just realized I’ve mostly forgotten about: Linux Networking

Trying to get two VPNs working together on the same Ubuntu system was a (relatively short) journey. I still know all the basics and whatnot, but I used to have all of the ifconfig commands memorized. Adding a default gateway, for example, used to be a common task for me back in the “old-school” days of being a Linux sysadmin. I had that command memorized. I knew how to read a route table! The move to Docker containers and AWS has rotted my brain. It’s also a testament to Docker that its networking Just Works in most cases. It’s also scary because running Docker on a system is dangerous since it, by default, modifies iptables to expose ports to the world (0.0.0.0). I wonder what other scary Docker things I’m missing as a result of forgetting how Linux Networking works.

vim Things to Remember

This is for vim stuff that I frequently have to Google for.

Copy output of shell command to file

This is done with:

:r !ls -1

Yanking and deleting properly

When trying to delete something and then paste, it’s best to use a dedicated register for yank instead:

"ay

and then paste with the register:

"ap

There’s also a separate register specifically for yanking:

"0p

Python things

Python is my main programming language.

Async/await

• How to use these
• How do they work under the hood
• How to mess this up badly

fastapi

• How to use this
• How it works under the hood
• How to mess up longin/security
• How to deploy this to Google Run with Cloud SQL, AWS EC2 with Aurora PSQL, IBM?
• How much more complicated does adding a proper SQL make this deployment, vs using SQLite
• Gitlab automatic deployment and unit testing with every commit

Distributed Systems

Reading this book, notes go here.