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matrix-docker-ansible-deploy/docs/configuring-dns.md

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Configuring your DNS server

To set up Matrix on your domain, you'd need to do some DNS configuration.

To use an identifier like @<username>:<your-domain>, you don't actually need to install anything on the actual <your-domain> server.

You do, however need to instruct the Matrix network that Matrix services for <your-domain> are delegated over to matrix.<your-domain>. As we discuss in Server Delegation, there are 2 different ways to set up such delegation:

  • either by serving a https://<your-domain>/.well-known/matrix/server file (from the base domain!)
  • or by using a _matrix._tcp DNS SRV record (don't confuse this with the _matrix-identity._tcp SRV record described below)

This playbook mostly discusses the well-known file method, because it's easier to manage with regard to certificates. If you decide to go with the alternative method (Server Delegation via a DNS SRV record (advanced)), please be aware that the general flow that this playbook guides you through may not match what you need to do.

General outline of DNS settings you need to do

Type Host Priority Weight Port Target
A matrix - - - matrix-server-IP
CNAME riot - - - matrix.<your-domain>
CNAME dimension - - - matrix.<your-domain>
SRV _matrix-identity._tcp 10 0 443 matrix.<your-domain>

Subdomains setup

As the table above illustrates, you need to create 2 subdomains (matrix.<your-domain> and riot.<your-domain>) and point both of them to your new server's IP address (DNS A record or CNAME record is fine).

The riot.<your-domain> subdomain is necessary, because this playbook installs the Riot web client for you. If you'd rather instruct the playbook not to install Riot (matrix_riot_web_enabled: false when Configuring the playbook later), feel free to skip the riot.<your-domain> DNS record.

The dimension.<your-domain> subdomain may be necessary, because this playbook could install the Dimension integrations manager for you. Dimension installation is disabled by default, because it's only possible to install it after the other Matrix services are working (see Setting up Dimension later). If you do not wish to set up Dimension, feel free to skip the dimension.<your-domain> DNS record.

_matrix-identity._tcp SRV record setup

To make the mxisd Identity Server (which this playbook installs for you) be authoritative for your domain name, set up one more SRV record that looks like this:

  • Name: _matrix-identity._tcp (use this text as-is)
  • Content: 10 0 443 matrix.<your-domain> (replace <your-domain> with your own)

When you're done with the DNS configuration and ready to proceed, continue with Configuring this Ansible playbook.