weijh imweijh

Proxmox VE tips

Just some tips I gathered over time. All in one easily reachable place so I can share it wherever I want.

Please note that unless you see a shebang (#!/...) these code blocks are usually meant to be copy & pasted directly into the shell. Some of the steps will not work if you run part of them in a script and copy paste other ones as they rely on variables set before.
The { and } surrounding some scripts are meant to avoid poisoning your bash history with individual commands, etc. You can ignore them if you manually copy paste the individual commands.
I chose to write things "in the open" that way so there's still some control and things don't become a black box.

FAQ on the xz-utils backdoor (CVE-2024-3094)

This is a living document. Everything in this document is made in good faith of being accurate, but like I just said; we don't yet know everything about what's going on.

Update: I've disabled comments as of 2025-01-26 to avoid everyone having notifications for something a year on if someone wants to suggest a correction. Folks are free to email to suggest corrections still, of course.

Background

Which GGUF is right for me? (Opinionated)

Good question! I am collecting human data on how quantization affects outputs. See here for more information: ggml-org/llama.cpp#5962

In the meantime, use the largest that fully fits in your GPU. If you can comfortably fit Q4_K_S, try using a model with more parameters.

llama.cpp feature matrix

See the wiki upstream: https://github.com/ggerganov/llama.cpp/wiki/Feature-matrix

FastAPI and Uvicorn Logging

When running FastAPI app, all the logs in console are from Uvicorn and they do not have timestamp and other useful information. As Uvicorn applies python logging module, we can override Uvicorn logging formatter by applying a new logging configuration.

Meanwhile, it's able to unify the your endpoints logging with the Uvicorn logging by configuring all of them in the config file log_conf.yaml.

Before overriding:

uvicorn main:app --reload

We have had some success using LS-to-LS over HTTP(S), which supports an HTTP(s) Load Balancer or Proxy in the middle, and can be secured with TLS/SSL. It can be made to be quite performant, but doing so requires some specific tuning.

Upstream (HTTP Output)

The upstream pipelie would contain a single HTTP output plugin aimed either directly at a downstream Logstash or at a Load Balancer, importantly configured with:

format => json_batch (for performance; without this one event will be sent at a time) and
retry_non_idempotent => true (for resilience; without this, some failures cannot be safely retried).

Depending on whether we ar sending directly to another Logstash or through an SSL-terminating Load Balancer or proxy, the output may need to be configured

with HTTP Basic credentials (user/password),

In the last years I've been asked multiple times about the comparison between raylib and SDL libraries. Unfortunately, my experience with SDL was quite limited so I couldn't provide a good comparison. In the last two years I've learned about SDL and used it to teach at University so I feel that now I can provide a good comparison between both.

Hope it helps future users to better understand this two libraries internals and functionality.

	// Draw a triangle on Windows using OpenGL 1.1
	// $ gcc -mwindows -o triangle triangle.c -lopengl32
	// This is free and unencumbered software released into the public domain.
	#define WIN32_LEAN_AND_MEAN
	#include <windows.h>
	#include <GL/gl.h>

	#define countof(a) (int)(sizeof(a) / (sizeof(*(a))))

	static LRESULT CALLBACK handler(HWND h, UINT msg, WPARAM wparam, LPARAM lparam)

	// $ cc -o persona persona.c
	// $ ./persona <test.txt
	// Ref: https://old.reddit.com/r/C_Programming/comments/1bmfb7p
	#include <stddef.h>
	#include <stdint.h>
	#include <string.h>

	#define assert(c) while (!(c)) (volatile int )0 = 0
	#define countof(a) (ptrdiff_t)(sizeof(a) / sizeof(*(a)))
	#define new(a, t, n) (t *)alloc(a, sizeof(t), _Alignof(t), n)

	// Font rendering demo
	// $ cc -o demo demo.c $(sdl2-config --cflags --libs)
	// Ref: https://old.reddit.com/r/C_Programming/comments/13ga82a
	// This is free and unencumbered software released into the public domain.
	#include "SDL.h"

	// https://itch.io/jam/lowrezjam2016/topic/19413/minimal-sprite-font-with-upperlower-cases-cleanreadable
	#define FONTW 72
	#define FONTH 143
	#define CHARW 9