Add mailserver host

hosts/mail/README.md

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+# Mail server
+
+## Overview
+Mail server hosted in OVH.
+
+## Specs
+* CPU - ??
+* Memory - ??
+
+### Disks
+Device | Partitions _(filesystem, usage)_
+--- | ---
+NVMe | `/dev/sda1` (ext4, NixOS Root)
+
+### Networks
+- DHCP on `10.0.1.0/24` subnet.
+- Tailscale on `100.64.0.0/10` subnet. FQDN: `mail.mesh.vimium.net`.
+

hosts/mail/default.nix

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+{ config, lib, pkgs, inputs, ... }:
+
+{
+  imports = [
+    ./hardware-configuration.nix
+    ./disko-config.nix
+    ../server.nix
+  ];
+
+  networking = {
+    hostId = "08ac2f14";
+    domain = "mesh.vimium.net";
+    firewall = {
+      enable = true;
+      allowedTCPPorts = [
+        22    # SSH
+      ];
+    };
+  };
+
+  users = {
+    users = {
+      root = {
+        openssh.authorizedKeys.keys = [
+          "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAILVHTjsyMIV4THNw6yz0OxAxGnC+41gX72UrPqTzR+OS jordan@vimium.com"
+        ];
+      };
+    };
+  };
+
+  services.openssh.settings.PermitRootLogin = lib.mkForce "prohibit-password";
+
+  security.acme.defaults = {
+    email = "hostmaster@vimium.com";
+    group = "nginx";
+    webroot = "/var/lib/acme/acme-challenge";
+  };
+
+  modules = {
+    services = {
+      borgmatic = {
+        enable = true;
+        directories = [
+          "/var/lib"
+        ];
+        repoPath = "ssh://kg2mpt28@kg2mpt28.repo.borgbase.com/./repo";
+      };
+      mail.enable = true;
+    };
+  };
+
+  system.stateVersion = "22.11";
+}

hosts/mail/disko-config.nix

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+{ lib, ... }:
+{
+  disko.devices = {
+    disk.disk1 = {
+      device = lib.mkDefault "/dev/sda";
+      type = "disk";
+      content = {
+        type = "gpt";
+        partitions = {
+          boot = {
+            name = "boot";
+            size = "2M";
+            type = "EF02";
+          };
+          esp = {
+            name = "ESP";
+            size = "300M";
+            type = "EF00";
+            content = {
+              type = "filesystem";
+              format = "vfat";
+              mountpoint = "/boot";
+            };
+          };
+          root = {
+            name = "root";
+            size = "100%";
+            content = {
+              type = "lvm_pv";
+              vg = "pool";
+            };
+          };
+        };
+      };
+    };
+    lvm_vg = {
+      pool = {
+        type = "lvm_vg";
+        lvs = {
+          root = {
+            size = "100%FREE";
+            content = {
+              type = "filesystem";
+              format = "ext4";
+              mountpoint = "/";
+              mountOptions = [
+                "defaults"
+              ];
+            };
+          };
+        };
+      };
+    };
+  };
+}

hosts/mail/hardware-configuration.nix

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+{ config, lib, pkgs, modulesPath, ... }:
+
+{
+  imports = [
+    (modulesPath + "/profiles/qemu-guest.nix")
+  ];
+
+  boot = {
+    initrd = {
+      availableKernelModules = [ "ata_piix" "uhci_hcd" "xen_blkfront" "vmw_pvscsi" ];
+      kernelModules = [ "nvme" ];
+    };
+    loader.grub = {
+      efiSupport = true;
+      efiInstallAsRemovable = true;
+    };
+    tmp.cleanOnBoot = true;
+  };
+
+  zramSwap.enable = true;
+}
+