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Do not ask for _matrix._tcp SRV records anymore

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With most people on Synapse v0.99+ and Synapse v1.0 now available,
we should no longer try to be backward compatible with Synapse 0.34,
because this just complicates the instructions for no good reason.
This commit is contained in:
Slavi Pantaleev 2019-06-12 14:51:10 +03:00
parent e39985b04a
commit 2e16257e50
4 changed files with 18 additions and 40 deletions
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13
CHANGELOG.md
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@ -1,3 +1,16 @@
# 2019-06-12
## Synapse v1.0
With [Synapse v1.0 now available](https://matrix.org/blog/2019/06/11/introducing-matrix-1-0-and-the-matrix-org-foundation) and most people being on at least Synapse v0.99, it's time to remove the `_matrix._tcp` DNS SRV record that we've been keeping for compatibility with old Synapse versions (<= 0.34).
According to the [Server Discovery specification](https://matrix.org/docs/spec/server_server/r0.1.2.html#server-discovery), it's no harm to keep the DNS SRV record. But since it's not necessary for federating with the larger Matrix network anymore, you should be safe to get rid of it.
**Note**: don't confuse the `_matrix._tcp` and `_matrix-identity._tcp` DNS SRV records. The latter, **must not** be removed.
Besides this optional/non-urgent DNS change, assuming you're already on Synapse v0.99, upgrading to Synapse v1.0 should be as simple as [re-running the playbook](docs/maintenance-upgrading-services.md).
# 2019-06-07
## (BC Break) Facebook bridge configuration is now entirely managed by the playbook

29
docs/configuring-dns.md
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@ -9,16 +9,12 @@ You do, however need to instruct the Matrix network that Matrix services for `<y
over to `matrix.<your-domain>`.
As we discuss in [Server Delegation](howto-server-delegation.md), there are 2 different ways to set up such delegation:
- using a `https://<your-domain>/.well-known/matrix/server` file (on the base domain!)
- using DNS SRV records
- 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)](howto-server-delegation.md#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.
To make matters worse, for backward compatibility until the Synapse server reaches v1.0, you need to set up a DNS SRV record anyway.
So don't be confused if the general flow of this playbook asks you for both DNS SRV records and for setting up a well-known file.
It's a temporary requirement during the Synapse v0.99/v1.0 transition.
## General outline of DNS settings you need to do
@ -27,12 +23,8 @@ It's a temporary requirement during the Synapse v0.99/v1.0 transition.
| A | `matrix` | - | - | - | `matrix-server-IP` |
| CNAME | `riot` | - | - | - | `matrix.<your-domain>` |
| CNAME | `dimension` | - | - | - | `matrix.<your-domain>` |
| SRV | `_matrix._tcp` | 10 | 0 | 8448 | `matrix.<your-domain>` |
| SRV | `_matrix-identity._tcp` | 10 | 0 | 443 | `matrix.<your-domain>` |
The `_matrix._tcp` SRV record is a temporary measure and will not be necessary in the near future.
In fact, it will have to be removed at some point. To learn more about that, read below.
## Subdomains setup
@ -44,23 +36,6 @@ If you'd rather instruct the playbook not to install Riot (`matrix_riot_web_enab
The `dimension.<your-domain>` subdomain may be necessary, because this playbook could install the [Dimension integrations manager](http://dimension.t2bot.io/) 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](configuring-playbook-dimension.md) later). If you do not wish to set up Dimension, feel free to skip the `dimension.<your-domain>` DNS record.
## `_matrix._tcp` SRV record setup (temporary requirement)
All services created by this playbook are meant to be installed on their own server (such as `matrix.<your-domain>`).
To use a Matrix user identifier like `@<username>:<your-domain>` while hosting services on `matrix.<your-domain>`, we need to instruct the Matrix network of such a delegation/redirection by means of setting up a DNS SRV record.
The SRV record should look like this:
- Name: `_matrix._tcp` (use this text as-is)
- Content: `10 0 8448 matrix.<your-domain>` (replace `<your-domain>` with your own)
A [new file-based mechanism for Federation Server Discovery](configuring-well-known.md#introduction-to-federation-server-discovery) is superseding the `_matrix._tcp` SRV record for our use case. **During the transition phase, you'll need to set up both mechanisms**. We'll instruct you how to set up the file-based mechanism after the [installation phase](installing.md) for this playbook.
Doing delegation/redirection of Matrix services using a DNS SRV record (`_matrix._tcp`) is a **temporary measure** for our use-case, that will only be necessary before Synapse v1.0 is released.
As more and more people upgrade to the Synapse v0.99 transitional release and just before the final Synapse v1.0 gets released, at some point in the near future **you will need to remove the `_matrix._tcp` SRV record** and leave only the [new file-based mechanism for Federation Server Discovery](configuring-well-known.md#introduction-to-federation-server-discovery) in place.
## `_matrix-identity._tcp` SRV record setup
To make the [mxisd](https://github.com/kamax-io/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:

7
docs/configuring-well-known.md
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@ -17,13 +17,8 @@ As [per the Server-Server specification](https://matrix.org/docs/spec/server_ser
Server delegation can be configured using DNS SRV records or by setting up a `/.well-known/matrix/server` file on the base domain (`<your-domain.com>`).
We have discussed the DNS SRV record method already in the "`_matrix._tcp` SRV record setup (temporary requirement)" section of [Configuring DNS](configuring-dns.md).
Both methods have their place and will continue to do so. Usually, you would need to use just one of these delegation methods.
Both methods have their place and will continue to do so. You only need to use just one of these delegation methods.
For simplicity reasons, our setup advocates for the `/.well-known/matrix/server` method and guides you into using that.
For backward compatibility with older Synapse servers (< v0.99), however, for now you are also required to set up a `_matrix._tcp` DNS SRV record (in addition to the `/.well-known/matrix/server` file on the base domain).
As the Synapse server progresses towards v1.0, only the `/.well-known/matrix/server` file will be used by us, unless you have a more special setup necessitating a DNS SRV record. At that future moment, you would need to remove the `_matrix._tcp` SRV record because Synapse v1.0+ will do the wrong thing if a SRV record exists.
To learn how to set up `/.well-known/matrix/server`, read the Installing section below.

9
roles/matrix-base/tasks/self_check_dns.yml
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@ -1,12 +1,7 @@
---
- name: Determine DNS SRV records to check (Matrix)
set_fact:
dns_srv_record_checks:
- service_and_protocol: "_matrix._tcp"
domain: "{{ (matrix_domain + '.') }}"
expected_target: "{{ (matrix_server_fqn_matrix + '.') }}"
expected_port: 8448
- set_fact:
dns_srv_record_checks: []
- block:
- set_fact: