This is a recurring post to discuss programming or other technical projects that we've been working on. Tell us about one of your recent projects, either at work or personal projects. What's interesting about it? Are you having trouble with anything?

This is a recurring post to discuss programming or other technical projects that we've been working on. Tell us about one of your recent projects, either at work or personal projects. What's interesting about it? Are you having trouble with anything?

Today's problem description: https://adventofcode.com/2025/day/6

Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

<details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>

Today's problem description: https://adventofcode.com/2025/day/7

Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

<details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>

I recently set up some public computers with Ubuntu at a hackerspace. People kept logging into their Gmail etc. and forgetting to log out. For their own benefit I changed the computers to use overlayfs so on reboot all changes from the base filesystem (Ubuntu 24.04 + packages + updates) are lost. I'm looking for tips on configuration. Keep in mind that because our users tend to be fairly technical I am not attempting to outright prevent changes, just prevent them by default.

Here are the current details:

• The machines have a wallpaper warning users that all changes are wiped on reboot
• The normal automatic update system is disabled (updates through it won't persist)
• I install updates and reboot on a cronjob at 5am every day (this uses overlayroot-chroot)
• The overlay is implemented as an encrypted filesystem on a separate partition, with the key generated on boot and held in memory
• Documentation is taped to the desktop computer itself educating users on how to make persistent changes

Today's problem description: https://adventofcode.com/2025/day/12

Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

<details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>

Today's problem description: https://adventofcode.com/2025/day/10

Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

<details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>

Today's problem description: https://adventofcode.com/2025/day/11

Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

<details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>

Today's problem description: https://adventofcode.com/2025/day/9

Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

<details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>

This is a recurring post to discuss programming or other technical projects that we've been working on. Tell us about one of your recent projects, either at work or personal projects. What's interesting about it? Are you having trouble with anything?

Today's problem description: https://adventofcode.com/2025/day/8

Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

<details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>

Today's problem description: https://adventofcode.com/2025/day/5

Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

<details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>

Today's problem description: https://adventofcode.com/2025/day/4

Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

<details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>

Hi!

I've decided to move some of my selfhosted things from on-prem (at home ;)) to the cloud, and at the same time I'd like to try and run this in EU, or at least europe. I'd like to get started fairly quickly as this was prompted by one of my home servers halfway dying on me.

The features I'm most interested in are approximately:

• Virtual machines.
• Storage. Cheap long term for backups (similar to S3 Glacier).
• Managed DB, most likely postgresql.
• Serverless jobs (similar to AWS lambda).
• IaaS (I've got a bit of experience with terraform, but it doesn't have to be that).
• Builtin monitoring.
• Git hosting, it's likely that I'll just go with github/gitlab here, but if there's a nice alternative I'm up for it.
• Automated sending of email. I'm using AWS SES atm, and I'm very happy with it.

Some other things:

• I intend to run a combination of services written by others, e.g. nextcloud and software I've written myself.
• I'll most likely be running linux only, but I prefer to select my own flavour where it makes sense.
• I much prefer managing permissions and users in gcp than in aws as I find aws way too complicated for my needs while gcp mostly just makes sense.
• I'd prefer a platform that's being developed and improving over time with big potential for the future.
• This is a hobby project, and some of these requirements may seem a bit contradictory or non-optimal, but that's ok.
• I have some experience running kubernetes (self-hosted), and I'm not a huge fan of the complexity and yaml files, at the same time OpenStack is getting kinda old, and I don't know if I think it's a platform for the future. But from what I see most of the options seems to be built on top of one of those.
• Cheaper is of course better, I don't have a company-sized budget, this is all coming out of my "hobby pocket".
• I live in Sweden, so datacenters geographically close is a plus.

Right now I'm looking at European alternatives to Amazon Web Services (AWS), and Scaleway is looking the most promising, but I'm really skimming the top when it comes to info atm.

Hope that makes sense =) I'm interested in all kinds of feedback.

Today's problem description: https://adventofcode.com/2025/day/3

Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

<details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>

Today's problem description: https://adventofcode.com/2025/day/1

Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

<details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>

With Advent of Code upon us, I wanted to check out how everyone is planning on participating. If you hadn't heard, this year has been shortened to 12 days along with the removal of the global leaderboard.

• Any changes to how you'll approach this year based on the updated format?
• Are you using an interesting language/approach?
• Any goals you're setting for yourself?

I'm a sucker for puzzles in general, but I also love hearing about everyone else's experiences, so I'm excited to hear what y'all are looking forward to!

Today's problem description: https://adventofcode.com/2025/day/2

Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

<details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>