I try to do the following: I have 1 form with some fields, this can upload files (photos, documents, etc.) It is simple, and this is then displayed in a list of files in another view with a short description. When I did it using a single node as a server, there was no problem because I used multer to receive the files and fs to rename them and filter them according to a pattern.
app.post("/archivo", upload.single('archivo'), filtro, (req, res) => {
console.log(req.file);
fs.rename(req.file.path, "./filtrado/" + req.file.originalname);
...... ................... ..
The issue is that my application has to have 20k of concurrent users , I've been doing some tests with Apache ab, using 4 nodes of 1gb in Digitalocean with Nginx of reverse proxy and I see that it supports around 7k (this only in the view that shows the files, I need to test the form)
I followed the tutorials of digitalocean, in each dopplet I created an instance of my application and I balance it with Nginx, with 1 instance it went up to 800, with 2 up to 2000, with 3 up to 3000-4000 and with 4 up to 7k, It is obvious that I need to continue climbing horizontally, but according to your experience, what would be a recommended way to do this? So the code in nodejs is small, there's nothing to optimize, I run it in production mode, I do not use Gzip or compression as Nginx already uses.
And with regard to the separate load test, I am not an expert on it because I never worry about it until now, but since I could do a complete test on my application, the tutorials are very limited in that regard. and apart from Apache ab which they would recommend me, thank you in advance.
