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4th chunk of `nixos/doc/manual/release-notes/rl-2009.section.md`
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  - [services.k3s.enable](options.html#opt-services.k3s.enable) Lightweight Kubernetes distribution

  - [services.magic-wormhole-mailbox-server.enable](options.html#opt-services.magic-wormhole-mailbox-server.enable) Magic Wormhole Mailbox Server

  - [services.malcontent.enable](options.html#opt-services.malcontent.enable) Parental Control support

  - [services.matrix-appservice-discord.enable](options.html#opt-services.matrix-appservice-discord.enable) Matrix and Discord bridge

  - [services.mautrix-telegram.enable](options.html#opt-services.mautrix-telegram.enable) Matrix-Telegram puppeting/relaybot bridge

  - [services.mirakurun.enable](options.html#opt-services.mirakurun.enable) Japanese DTV Tuner Server Service

  - [services.molly-brown.enable](options.html#opt-services.molly-brown.enable) Molly-Brown Gemini server

  - [services.mullvad-vpn.enable](options.html#opt-services.mullvad-vpn.enable) Mullvad VPN daemon

  - [services.ncdns.enable](options.html#opt-services.ncdns.enable) Namecoin to DNS bridge

  - [services.nextdns.enable](options.html#opt-services.nextdns.enable) NextDNS to DoH Proxy service

  - [services.nix-store-gcs-proxy](options.html#opt-services.nix-store-gcs-proxy) Google storage bucket to be used as a nix store

  - [services.onedrive.enable](options.html#opt-services.onedrive.enable) OneDrive sync service

  - [services.pinnwand.enable](options.html#opt-services.pinnwand.enable) Pastebin-like service

  - [services.pixiecore.enable](options.html#opt-services.pixiecore.enable) Manage network booting of machines

  - [services.privacyidea.enable](options.html#opt-services.privacyidea.enable) Privacy authentication server

  - [services.quorum.enable](options.html#opt-services.quorum.enable) Quorum blockchain daemon

  - [services.robustirc-bridge.enable](options.html#opt-services.robustirc-bridge.enable) RobustIRC bridge

  - [services.rss-bridge.enable](options.html#opt-services.rss-bridge.enable) Generate RSS and Atom feeds

  - [services.rtorrent.enable](options.html#opt-services.rtorrent.enable) rTorrent service

  - [services.smartdns.enable](options.html#opt-services.smartdns.enable) SmartDNS DNS server

  - [services.sogo.enable](options.html#opt-services.sogo.enable) SOGo groupware

  - [services.teeworlds.enable](options.html#opt-services.teeworlds.enable) Teeworlds game server

  - [services.torque.mom.enable](options.html#opt-services.torque.mom.enable) torque computing node

  - [services.torque.server.enable](options.html#opt-services.torque.server.enable) torque server

  - [services.tuptime.enable](options.html#opt-services.tuptime.enable) A total uptime service

  - [services.urserver.enable](options.html#opt-services.urserver.enable) X11 remote server

  - [services.wasabibackend.enable](options.html#opt-services.wasabibackend.enable) Wasabi backend service

  - [services.yubikey-agent.enable](options.html#opt-services.yubikey-agent.enable) Yubikey agent

  - [services.zigbee2mqtt.enable](options.html#opt-services.zigbee2mqtt.enable) Zigbee to MQTT bridge

## Backward Incompatibilities {#sec-release-20.09-incompatibilities}

When upgrading from a previous release, please be aware of the following incompatible changes:

- MariaDB has been updated to 10.4, MariaDB Galera to 26.4. Before you upgrade, it would be best to take a backup of your database. For MariaDB Galera Cluster, see [Upgrading from MariaDB 10.3 to MariaDB 10.4 with Galera Cluster](https://mariadb.com/kb/en/upgrading-from-mariadb-103-to-mariadb-104-with-galera-cluster/) instead. Before doing the upgrade read [Incompatible Changes Between 10.3 and 10.4](https://mariadb.com/kb/en/upgrading-from-mariadb-103-to-mariadb-104/#incompatible-changes-between-103-and-104). After the upgrade you will need to run `mysql_upgrade`. MariaDB 10.4 introduces a number of changes to the authentication process, intended to make things easier and more intuitive. See [Authentication from MariaDB 10.4](https://mariadb.com/kb/en/authentication-from-mariadb-104/). unix_socket auth plugin does not use a password, and uses the connecting user's UID instead. When a new MariaDB data directory is initialized, two MariaDB users are created and can be used with new unix_socket auth plugin, as well as traditional mysql_native_password plugin: root\@localhost and mysql\@localhost. To actually use the traditional mysql_native_password plugin method, one must run the following:
Title: Release 20.09 - Continued Service Additions and Backward Incompatibilities
Summary
This section continues listing new services in NixOS 20.09, including K3s, Magic Wormhole Mailbox, Malcontent, Matrix bridges, Mirakurun, Molly-Brown, Mullvad VPN, Ncdns, NextDNS, Nix-store GCS proxy, OneDrive, Pinnwand, Pixiecore, privacyIDEA, Quorum, RobustIRC bridge, RSS-bridge, rtorrent, SmartDNS, Sogo, Teeworlds, Torque (MOM and server), Tuptime, Urserver, Wasabi backend, Yubikey agent, and zigbee2mqtt. It also highlights backward incompatibilities, specifically regarding the upgrade to MariaDB 10.4 and MariaDB Galera, recommending database backups and outlining authentication changes requiring potential manual intervention.