The data centers used for Masto.host are from OVH and are located in France.
All servers run Debian.
The TLS (https) included are provided by Let's Encrypt.
Other software used: Node.js + Redis + PostgresSQL + Ruby + Nginx + Docker + OpenStack Swift.
Shared Hosting Infrastructure
The image above is a demonstrative example, the number of servers keeps going up and down as needed.
Each Private VLAN can only communicate with the closest VLAN (in the graph) and under a specific number of ports.
The SMTP used to send notification emails is externally provided by MailGun.
The media storage (Object Storage) is hosted directly with OVH and is completely independent from the Masto.host cloud.
In front of the Object Storage is a CDN provided by BunnyCDN.