Nine Server types you can host on a Raspberry Pi

Web Server

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Database Server: MariaDB

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File Server: Samba, NFS

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FTP Server: ProFTPD

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DNS Server: BIND, dnsmasq

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Mail Server: Postfix, Dovecot

To run a mail server on a Raspberry Pi, you'll need to set up Postfix to send and receive email. You will also have to install additional services such as Dovecot or Courier to access your emails.

DNS Server: BIND, dnsmasq

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VPN Server: OpenVPN, WireGuard

A VPN (Virtual Private Network) server encrypts the connection between devices, making it more difficult for third parties to intercept or access the data transferred.

Media Server: Plex, Emby

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Game Server: Minecraft, Terraria

You can fit your Raspberry Pi into downtime by hosting a game server on it. There are several games you can self-host on a Raspberry Pi server but the two most popular options are Minecraft and Terraria.