Mattermost

Mattermost is an open source, self-hosted Slack-alternative. As an alternative to proprietary SaaS messaging, Mattermost brings all your team communication into one place, making it searchable and accessible anywhere.

Installation

Add mattermost to your environment.systemPackages.

environment.systemPackages = with pkgs; [
  mattermost
];

Setup

Mattermost

To setup Mattermost, you need to enable its service, and provide it with a site url.

services.mattermost = {
  enable = true;
  siteUrl = "https://mattermost.example.com"; # Set this to the URL you will be hosting the site on.
};

After a rebuild, Mattermost will now be accessible at http://127.0.0.1:8065. To set it up to match your siteUrl, follow the Nginx config below.

Nginx

While optional, if you are hosting Mattermost alongside other web services, or need SSL (https), you will likely want to set up a web server like Nginx.

Installation

Add nginx to your environment.systemPackages.

environment.systemPackages = with pkgs; [
  mattermost
  nginx
];

Setup

The following is an example Nginx setup that enables SSL, and configures mattermost.example.com to route to Mattermost.

# Allow ports 80 and 443 for Nginx
networking.firewall.allowedTCPPorts = [ 80 443 ];

# Set up for SSL certification
security.acme = {
  acceptTerms = true;
  defaults.email = "webmaster@example.com"; # Replace with your preferred email address.
};

# Configure Nginx
services.nginx = {
  enable = true;
  recommendedProxySettings = true;
  recommendedTlsSettings = true;    
  virtualHosts = {
    # Replace with the domain from your siteUrl
    "mattermost.example.com" = {
      forceSSL = true; # Enforce SSL for the site
      enableACME = true; # Enable SSL for the site
      locations."/" = {
        proxyPass = "http://127.0.0.1:8065"; # Route to Mattermost
        proxyWebsockets = true;
      };
    };
  };
};

After a rebuild, Mattermost will now be accessible at siteUrl (assuming you have configured your DNS).