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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.

Required DNS settings for services enabled by default

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

Be mindful as to how long it will take for the DNS records to propagate.

If you are using Cloudflare DNS, make sure to disable the proxy and set all records to DNS only. Otherwise, fetching certificates will fail.

Required DNS settings for optional services

Type Host Priority Weight Port Target
CNAME dimension (*) - - - matrix.<your-domain>
CNAME jitsi (*) - - - matrix.<your-domain>
CNAME stats (*) - - - matrix.<your-domain>

Subdomains setup

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

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

The jitsi.<your-domain> subdomain may be necessary, because this playbook could install the Jitsi video-conferencing platform for you. Jitsi installation is disabled by default, because it may be heavy and is not a core required component. To learn how to install it, see our Jitsi guide. If you do not wish to set up Jitsi, feel free to skip the jitsi.<your-domain> DNS record.

The stats.<your-domain> subdomain may be necessary, because this playbook could install Grafana and setup performance metrics for you. Grafana installation is disabled by default, it is not a core required component. To learn how to install it, see our metrics and graphs guide. If you do not wish to set up Grafana, feel free to skip the stats.<your-domain> DNS record. It is possible to install Prometheus without installing Grafana, this would also not require the stats.<your-domain> subdomain.

_matrix-identity._tcp SRV record setup

To make the ma1sd 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.