base/postfix: remove, base:nullmailer: init

base/default.nix

@@ -30,9 +30,9 @@
     ./services/journald-upload.nix
     ./services/logrotate.nix
     ./services/nginx.nix
+    ./services/nullmailer.nix
     ./services/openssh.nix
     ./services/polkit.nix
-    ./services/postfix.nix
     ./services/prometheus-flake-input-exporter.nix
     ./services/prometheus-node-exporter.nix
     ./services/prometheus-systemd-exporter.nix

base/services/irqbalance.nix

@@ -1,4 +1,22 @@
-{ ... }:
+{ config, pkgs, lib, ... }:
+let
+  cfg = config.services.irqbalance;
+in
 {
   services.irqbalance.enable = true;
-}
+
+  # irqbalance only has meaningful work to do on multi-socket machines, so
+  # skip starting it pointlessly everywhere else.
+  systemd.services.irqbalance.serviceConfig.ExecCondition = let
+    isMultiSocket = pkgs.writeShellApplication {
+      name = "irqbalance-is-multi-socket";
+      runtimeInputs = [ pkgs.coreutils ];
+      text = ''
+        sockets=$(cat /sys/devices/system/cpu/cpu*/topology/physical_package_id | sort -u | wc -l)
+        [ "$sockets" -gt 1 ]
+      '';
+    };
+  in lib.mkIf cfg.enable [
+    (lib.getExe isMultiSocket)
+  ];
+}

base/services/nullmailer.nix

@@ -0,0 +1,15 @@
+{ config, lib, ... }:
+{
+  services.nullmailer = {
+    enable = true;
+
+    config = {
+      adminaddr = "root@pvv.ntnu.no";
+      defaultdomain = "pvv.ntnu.no";
+      defaulthost = "pvv.ntnu.no";
+
+      me = lib.mkDefault config.networking.fqdn;
+      remotes = lib.mkDefault "smtp.pvv.ntnu.no smtp port=587 starttls";
+    };
+  };
+}

base/services/postfix.nix

@@ -1,22 +0,0 @@
-{ config, pkgs, lib, ... }:
-let
-  cfg = config.services.postfix;
-in
-{
-  services.postfix = {
-    enable = true;
-
-    settings.main = {
-      myhostname = "${config.networking.hostName}.pvv.ntnu.no";
-      mydomain = "pvv.ntnu.no";
-
-      # Nothing should be delivered to this machine
-      mydestination = [ ];
-
-      relayhost = [ "smtp.pvv.ntnu.no:465" ];
-
-      smtp_tls_wrappermode = "yes";
-      smtp_tls_security_level = "encrypt";
-    };
-  };
-}

hosts/bicep/services/postgresql/default.nix

@@ -14,6 +14,7 @@ in
     extensions = ps: with ps; [ pg_repack ];
     enableTCPIP = true;
 
+    # NOTE: md5 accepts both md5 and scram-sha-256
     authentication = ''
       host all all ${values.ipv4-space} md5
       host all all ${values.ipv6-space} md5
@@ -76,6 +77,15 @@ in
       maintenance_io_concurrency = 100;
       wal_recycle = true;
 
+      # -------------------------------- #
+
+      # Authentication
+      password_encryption = "scram-sha-256";
+
+      # Logging
+      log_connections = "authorization";
+      log_disconnections = true;
+
       # SSL
       ssl = true;
       ssl_cert_file = "/run/credentials/postgresql.service/cert";

hosts/temmie/services/userweb/mail.nix

@@ -1,14 +1,6 @@
 { config, lib, pkgs, ... }:
 {
-  services.postfix.enable = lib.mkForce false;
-
-  services.nullmailer = {
-    enable = true;
-    config = {
-      me = config.networking.fqdn;
-      remotes = "mail.pvv.ntnu.no smtp --port=25";
-    };
-  };
+  services.nullmailer.enable = true;
 
   services.bro = {
     enable = true;