diff --git a/hosts/epyc.nix b/hosts/epyc.nix
index 67025ab..4d9dbbf 100644
--- a/hosts/epyc.nix
+++ b/hosts/epyc.nix
@@ -17,6 +17,13 @@ in
   boot.loader.systemd-boot.enable = true;
   boot.loader.efi.canTouchEfiVariables = true;
 
+  # Open public access to our PostgreSQL.
+  services.postgresql.enableTCPIP = true;
+  services.postgresql.authentication = ''
+  host  hydra-nixos-org hydra_ro  ::/0  trust
+  '';
+  networking.firewall.allowedTCPPorts = [ 5432 ];
+
   virtualisation.nvisor.vms = {
     vm01 = {
       config = { pkgs, ... }: {