[webhosting] would you have references to start a webhosting business?

If you are thinking about starting something like GoDaddy, AWS, ... already do, I wouldn't. I think only BIG Companies can compete at this level.

Apparently, these company allow to resell webhosting, for example of web developer wishing to provide a full solution

Boutique is where it's at.

Cookie cutters are a plenty.

There's lots of room for boutique hosting companies.

Kind of like how micro breweries have cut into the big guy's sales big time because they make a far superior product.

Right now, Ubuntu + NGINX + MariaDB + Mastodon would be a great place to start. Set it up, play with it, get a feel for it, then set up a few for paying customers. Make sure to start off with a decent server setup that is backed up properly. Don't do a RackSpace.

Kind of like how micro breweries have cut into the big guy's sales big time because they make a far superior product.

Sold... Thank you for the hint

If you have limited experience with servers, virtualization, networking, or customer support, starting with a reseller service can be a good option. This approach lets you understand these operations before launching an entire hosting business. Once you have acquired some experience, you will be better prepared to handle the complexities of running your own hosting service.

With customer support, zero experience at all. A reseller service looks good, I need to find a niche to target specific customers

I suggest doing some research on how to set up a small cluster to host the virtual machines that will provide the boutique web services. We use Veeam for our backup solution sets. It works well and recovers well in a pinch. One can start with two or three generations back server setups that are very reasonable in cost on auction sites or maybe a local refurbished server dealer is to be had.

It's not that difficult. There are some pretty good peeps in both the LINUX and Windows Server (Storage Spaces Direct/Azure Stach HCI) communities that can provide some guidance on a direction to go in.

Using a third party will be a lot more expensive in the long run. By planning out and deploying on your own hardware you eliminate most of the monthly costs that would be there customers or not. The ISP connections would be your principal cost plus power and cooling.

Going for my own hardware would be my preferred solution too. To begin, I should be able to share my home IP and slice one Nginx service into several domains

There are some pretty good articles on running several WordPress instances on a single Ubuntu OS. Mastodon requires a bit more work to make it happen but it's also possible to do so. It's also possible to slice up a server using small virtual machines with a dedicated Ubuntu OS, NGINX, MariaDB, and WordPress or the Mastodon recipe as well.

In the end, it's important to keep in mind that the customer and their data comes first. That means having a good disaster recovery plan in place and have it tested.

The most essential factors in web hosting:
- Storage:  you can pack more clients into a certain amount of storage space.
- Technical support and Ticketing systems
- Fair price
- Fast deploy
- Good network
- DRP

If I can afford it, VMs would be easier to install than sharing a single server, and safer for the customers. And I need to train about disaster recovery, I overlook this kind of issue so far

That's our attitude. We can segment the VMs from each other using the router.