Levi Durfee

Primes

Sat, 01 Jul 2023 19:20:44 -0500

singles

hash	link	size
8c148ad13cc8b3f08a763eb111947153	8c148ad13ccb3f08a763eb111947153	1K

ranges

first	last	link	size	uncompressed
2	999,999,937	download	479M
999,999,937	9,999,999,967	download	985M
9,999,999,967	49,999,999,967	download	1.6G	19G

Go Optional Options with Functions Pattern

Fri, 30 Jun 2023 10:40:44 -0500

tldr code.

There’s a new link on my links page to Golang Functional Options Pattern.

I’m not a fan of competing for SEO on a post. I am a fan of sharing the work others have done and giving them credit.

I really like Option 3 from the Golang Cafe page.

ZeroTrust Email Service

Mon, 21 Nov 2022 09:21:06 -0400

I wanted to build a disposable ZeroTrust Email Service like GuerrillaMail. So, I found the Go code that they use and built my own mail server. I bought a cheap domain name, and boom we have ZeroTrust Mail. I created an API in Go to retrieve the email from the database. I built the front-end in React with TypeScript and used TailwindCSS to style it.

Please feel free to use it and let me know if you have any requests.

Docker Multi-state Builds and Go

Fri, 07 Oct 2022 19:21:06 -0400

I recently ran into an issue with building my Go app in one container and then running it in another one. I do this to make my container image smaller.

Without CGO_ENABLED=0, in a multi-stage build, it will say something like the following.

exec /app/main: no such file or directory.

FROM golang:1.16 AS builder
WORKDIR /src/
COPY main.go go.mod go.sum /src/
RUN go get
# Without `CGO_ENABLED=0`, in a multi-stage build, it will say something like
# exec /app/main: no such file or directory
RUN CGO_ENABLED=0 go build -o /src/main /src/main.go

FROM alpine:latest
WORKDIR /app/
COPY --from=builder /src/main /app/main
COPY index.html /app/
EXPOSE 8080
ENTRYPOINT [ "/app/main" ]

Cloudflare Warp Linux Taskbar

Thu, 29 Sep 2022 01:20:44 -0500

I won’t waste your time with a lot of words in hopes it helps rank me on Google.

If you want to get rid of the Cloudflare Warp icon on your taskbar, run the following commands.

systemctl --user disable warp-taskbar
systemctl --user stop warp-taskbar

Below is a screenshot of the icon, circled in red, from my desktop.

Referrals

Sun, 14 Aug 2022 19:20:44 -0500

interserver

Charm - tools to make the command line glamorous.

Fri, 29 Jul 2022 19:20:44 -0500

I recently came across Charm, they build tools to make the command line glamorous.

They’re using SSH keys for authentication, so no one has to create an account. They also have their own Charm cloud, but make it very easy to host your own Charm server. The Charm server can be used with Skate, which is a personal key-value store that is backed up to the cloud.

I also really enjoy their graphics for their products. Check out the Charm website to see what I mean.

Mirrors

Fri, 29 Jul 2022 19:20:44 -0500

I like to mirror open-source software versions that may be hard to find one day.

Go

1.19.4

File name	SHA256
go1.19.4.src.tar.gz	eda74db4ac494800a3e66ee784e495bfbb9b8e535df924a8b01b1a8028b7f368
go1.19.4.darwin-amd64.pkg	3ca65ff0606054b076c009d3bb3b8aba0032b75ac690de716be5c44ce57da052
go1.19.4.darwin-arm64.pkg	63f5dd4f94c2a6cde1b035c2373da4d0b95f933f3a0a7169f9f78da953efbb59
go1.19.4.linux-amd64.tar.gz	c9c08f783325c4cf840a94333159cc937f05f75d36a8b307951d5bd959cf2ab8

PHP

Version	Link	Signature
5.6.40	https://cdn.x6c.co/tar.gz/php/php-5.6.40.tar.gz
7.4.30	https://cdn.x6c.co/tar.gz/php/php-7.4.30.tar.gz	asc
8.0.21	https://cdn.x6c.co/tar.gz/php/php-8.0.21.tar.gz	asc
8.1.8	https://cdn.x6c.co/tar.gz/php/php-8.1.8.tar.gz	asc

Primes

Prime	Link
M82589933	https://cdn.x6c.co/primes/M82589933.txt

Books

Thu, 28 Jul 2022 19:20:44 -0500

While I think everyone should read all of these books, I broke them down into some categories.

Core

Books I think everyone should read.

Tech

For those interested in tech, this is my list.

Mastering Linux Security and Hardening

Money

Books about managing, investing, and trading.

Managing

The Total Money Makeover

Investing

The Bogleheads' Guide to Investing

Trading

Technical Analysis of Stock Trends
Best Loser Wins: Why Normal Thinking Never Wins the Trading Game

Stocks

How to Day Trade for a Living: A Beginner’s Guide to Trading Tools and Tactics, Money Management, Discipline and Trading Psychology

Options

Option Volatility and Pricing: Advanced Trading Strategies and Techniques
The Option Trader’s Hedge Fund: A Business Framework for Trading Equity and Index Options

Raspberry Pi setup

Mon, 24 Jan 2022 08:18:35 -0500

Always change the default Pi password.

passwd

Create another user.

sudo adduser levi
sudo usermod -aG sudo levi

Copy your SSH key to the Pi.

ssh-copy-id levi@host
ssh levi@host
sudo deluser -remove-home pi

Change the hostname.

sudo raspi-config

System Options
- Hostname

Reboot. Then update.

sudo apt update
sudo apt upgrade -y

Install some basic stuff.

sudo apt install -y     \
    ca-certificates     \
    && sudo update-ca-certificates

sudo apt install -y \
    gnupg2          \
    htop            \
    vim

5 simple tips for securing your server

Fri, 21 Jan 2022 19:20:44 -0500

DigitalOcean’s tutorial, Initial Server Setup with Debian 11, covers many good topics. It would be best if you didn’t SSH into a server as root, so you’ll need to create a new user. You may skip setting up UFW if you plan on using a Firewall provided by your Cloud.

Linode’s guide, Getting Started with Cloud Firewalls, will help you restrict server access. I often create a rule that allows only my IP address to connect to the server using SSH. Hackers are constantly trying to brute-force any server running SSH.

If you decide to use UFW, you should install Fail2ban to stop brute-force attacks. After so many failed attempts, it will block their IP for a specific amount of time. Be sure to keep reading so you can learn some more tips on securing SSH.

After getting your initial server setup, you’ll want to take some steps to make your SSH daemon more secure. The post, How To Harden OpenSSH on Ubuntu 20.04, also works with Debian. Disabling password authentication and requiring users to use SSH keys should be something you always do.

If you’re truly serious about securing your server, then you should consider installing SELinux. While it can be challenging to get started, you’ll be much safer once you have everything configured. One tip I found helpful is that you should begin in “permissive” mode to see what policies need tweaking.

Learning Rust - Part 1

Tue, 18 Jan 2022 14:11:05 -0500

If you’re going to learn Rust, then you’ll need some resources!

Rust Resources

The Rust community does an excellent job at providing resources to help anyone learn the language. The three primary resources on the Learn Rust page are the following.

“the book”

“the book” is a great starting point for anyone eager to learn the basic syntax and the features that make Rust unique. They do a nice job at explaining the differences between other common languages, and why they made those decisions to do things differently.

Rustlings

Rustlings is perfect if you want to dive right in! We all encounter errors when writing code in a new language. So, that is why Rust spent time crafting helpful messages so you understand what is wrong. In other languages, I’ve often ignored the message, looked at the line number, then tried to figure it out on my own. While doing the Rustlings course you’ll encounter some of the most common error messages and get practice fixing those issues with real code.

Rust by Example

Rust by Example is what happens with “the book” and Rustlings make a baby. You get a less verbose book with real-worldish examples.

Conclusion

I recommend you:

Read “the book”
Do the Rustlings course
Read Rust by Example

There are some concepts that may be confusing at first, and you may be tempted to stop to fully understand them. I’d recommend you just keep reading until you’ve completed all three steps. By the end, everything will be more clear. And if you still aren’t sure on a few topics, go back to “the book” or research The Rust Standard Library.

Levi Durfee

Primes

singles

ranges

Go Optional Options with Functions Pattern

ZeroTrust Email Service

Docker Multi-state Builds and Go

Cloudflare Warp Linux Taskbar

Links

Go

Projects

Referrals

Charm - tools to make the command line glamorous.

Mirrors

Go

1.19.4

PHP

Primes

Books

Core

Tech

Money

Managing

Investing

Trading

Stocks

Options

Raspberry Pi setup

Links

5 simple tips for securing your server

Learning Rust - Part 1

Rust Resources

“the book”

Rustlings

Rust by Example

Conclusion

Levi Durfee

Primes

singles

ranges

Go Optional Options with Functions Pattern

ZeroTrust Email Service

Docker Multi-state Builds and Go

Cloudflare Warp Linux Taskbar

Links

Go

Projects

Social

Referrals

Charm - tools to make the command line glamorous.

Mirrors

Go

1.19.4

PHP

Primes

Books

Core

Tech

Money

Managing

Investing

Trading

Stocks

Options

Raspberry Pi setup

Links

5 simple tips for securing your server

Learning Rust - Part 1

Rust Resources

“the book”

Rustlings

Rust by Example

Conclusion