Extract common server packages and services

This should improve maintainability a bit by combining common services
running on the servers.

Additionally, this parameterises common parts by servers' host names
instead of the host-name-like symbols as before.

1 files changed, 96 insertions, 36 deletions

diff --git a/tw/system/common.scm b/tw/system/common.scm
index fb8c50f9..57be678b 100644
--- a/tw/system/common.scm
+++ b/tw/system/common.scm
@@ -1,22 +1,24 @@
 (define-module (tw system common)
   #:use-module (ice-9 format)
   #:use-module (ice-9 regex)
+  #:use-module (ice-9 string-fun)
   #:use-module ((srfi srfi-1)
                 #:select (fold fold-right))
   #:use-module (gnu)
   #:use-module (gnu services)
-  #:use-module (gnu services vpn)
   #:use-module (gnu system)
   #:use-module (gnu system keyboard)
   #:use-module (guix gexp))
 
 (use-package-modules admin avahi certs disk file-systems linux lsof man
-                     moreutils search version-control vpn)
+                     moreutils python rsync search shells version-control vpn)
+(use-service-modules mcron monitoring networking ssh vpn)
 
-(define-public %common-system-packages
-  (list acpi btrfs-progs cpupower efibootmgr exfat-utils git glibc-locales
-        hddtemp htop lshw lsof man-db man-pages man-pages-posix mlocate
-        moreutils nss-certs nss-mdns strace wireguard-tools))
+(define-public %base-system-packages
+  (cons* acpi btrfs-progs cpupower efibootmgr exfat-utils git glibc-locales
+         hddtemp htop lshw lsof man-db man-pages man-pages-posix mlocate
+         moreutils nss-certs nss-mdns python rsync strace wireguard-tools
+         %base-packages))
 
 (define-public %british-keyboard
   (keyboard-layout
@@ -27,6 +29,59 @@
                     "keypad:oss"
                     "kpdl:kposs")))
 
+;; This is used for the servers, and also by (tw home common) to generate the
+;; appropriate ~/.ssh/config.
+(define-public %ssh-ports
+  '(("lud.twilken.net" . 22022)
+    ("vin.twilken.net" . 22022)
+    ("pi3.twilken.net" . 51022)))
+
+(define-public (server-base-services host-name)
+  (cons*
+   ;; SSH login, allowing access only for me.  To give more public keys
+   ;; access, extend `openssh-service-type'.
+   (service openssh-service-type
+     (openssh-configuration
+      (port-number (assoc-ref %ssh-ports host-name))
+      (password-authentication? #f)
+      (accepted-environment '("LANG" "LC_*"))
+      (authorized-keys
+       `(("timo"
+          ,(local-file "files/timo.pub")
+          ,(local-file "files/timo-phone-gpg.pub"))))))
+
+   ;; Prometheus node exporter
+   (service prometheus-node-exporter-service-type
+     (prometheus-node-exporter-configuration
+      (web-listen-address
+       (string-replace-substring
+        (car   ; get the IPv4 address
+         (wireguard-peer-allowed-ips
+          (assoc-ref %wireguard-peers host-name)))
+        "/32" ":9100"))))
+
+   (simple-service 'disk-maintenance mcron-service-type
+     (list #~(job "0 2 * * *" "guix gc -d 2w")
+           #~(job "0 4 * * *"  ; after guix gc
+                  (string-append #$(file-append util-linux "/sbin/fstrim")
+                                 " --fstab --verbose"))))
+
+   ;; Network setup
+   (service dhcp-client-service-type)
+   (service ntp-service-type)
+   (wireguard-service host-name)
+
+   ;; Delete the annoying message on SSH login.  Beware when setting up a new
+   ;; host, as `allow-empty-passwords' will block login and sudo execution for
+   ;; all Guix-declared users (as these have no initial password).
+   (modify-services %base-services
+     (login-service-type
+      config =>
+      (login-configuration
+       (inherit config)
+       (motd (plain-file "no-motd" ""))
+       (allow-empty-passwords? #f))))))
+
 (define-public %server-base-user-accounts
   (cons* (user-account
           (name "timo")
@@ -45,34 +100,39 @@
          %base-user-accounts))
 
 (define %wireguard-peers
-  `((lap . ,(wireguard-peer
-             (name "lap.wg")
-             (public-key "lap/DvCb8xXLUCqcaPEx8kCRcoeV4ScTMVZW5hvvNzA=")
-             (preshared-key "/etc/wireguard/lap.psk")
-             (allowed-ips '("10.0.0.1/32" "fc00::1/128"))))
-    (lud . ,(wireguard-peer
-             (name "lud.wg")
-             (endpoint "lud.twilken.net:58921")
-             (public-key "lud/9sbXVdOYXxOkRgAB+b/17QxbwllfJY/pbA3/MkE=")
-             (preshared-key "/etc/wireguard/lud.psk")
-             (allowed-ips '("10.0.0.2/32" "fc00::2/128"))))
-    (vin . ,(wireguard-peer
-             (name "vin.wg")
-             (endpoint "vin.twilken.net:58921")
-             (public-key "vin/Im+sOszZFE01UF1+QlyxLP1PsPXJgTz4KmgvL3Y=")
-             (preshared-key "/etc/wireguard/vin.psk")
-             (allowed-ips '("10.0.0.3/32" "fc00::3/128"))))
-    (fp4 . ,(wireguard-peer
-             (name "fp4.wg")
-             (public-key "fp4/aLAVBADTy+UGmNh011w1CFOOwq70Df6EWlZRkAs=")
-             (preshared-key "/etc/wireguard/fp4.psk")
-             (allowed-ips '("10.0.0.4/32" "fc00::4/128"))))
-    (pi3 . ,(wireguard-peer
-             (name "pi3.wg")
-             (endpoint "pi3.twilken.net:58922")
-             (public-key "pi3/ThUH4qDTuyvNQIiiyy2dbziF/xLRTwO0+vcUoVY=")
-             (preshared-key "/etc/wireguard/pi3.psk")
-             (allowed-ips '("10.0.0.5/32" "fc00::5/128"))))))
+  `(("lap.twilken.net" .
+     ,(wireguard-peer
+       (name "lap.wg")
+       (public-key "lap/DvCb8xXLUCqcaPEx8kCRcoeV4ScTMVZW5hvvNzA=")
+       (preshared-key "/etc/wireguard/lap.psk")
+       (allowed-ips '("10.0.0.1/32" "fc00::1/128"))))
+    ("lud.twilken.net" .
+     ,(wireguard-peer
+       (name "lud.wg")
+       (endpoint "lud.twilken.net:58921")
+       (public-key "lud/9sbXVdOYXxOkRgAB+b/17QxbwllfJY/pbA3/MkE=")
+       (preshared-key "/etc/wireguard/lud.psk")
+       (allowed-ips '("10.0.0.2/32" "fc00::2/128"))))
+    ("vin.twilken.net" .
+     ,(wireguard-peer
+       (name "vin.wg")
+       (endpoint "vin.twilken.net:58921")
+       (public-key "vin/Im+sOszZFE01UF1+QlyxLP1PsPXJgTz4KmgvL3Y=")
+       (preshared-key "/etc/wireguard/vin.psk")
+       (allowed-ips '("10.0.0.3/32" "fc00::3/128"))))
+    ("fp4.twilken.net" .
+     ,(wireguard-peer
+       (name "fp4.wg")
+       (public-key "fp4/aLAVBADTy+UGmNh011w1CFOOwq70Df6EWlZRkAs=")
+       (preshared-key "/etc/wireguard/fp4.psk")
+       (allowed-ips '("10.0.0.4/32" "fc00::4/128"))))
+    ("pi3.twilken.net" .
+     ,(wireguard-peer
+       (name "pi3.wg")
+       (endpoint "pi3.twilken.net:58922")
+       (public-key "pi3/ThUH4qDTuyvNQIiiyy2dbziF/xLRTwO0+vcUoVY=")
+       (preshared-key "/etc/wireguard/pi3.psk")
+       (allowed-ips '("10.0.0.5/32" "fc00::5/128"))))))
 
 (define-public %wireguard-etc-hosts
   (let ((basic-hosts-file "\
@@ -99,8 +159,8 @@ ff02::3         ip6-allhosts
            basic-hosts-file
            (map cdr %wireguard-peers)))))
 
-(define-public (wireguard-service host)
-  (let ((own-peer (assoc-ref %wireguard-peers host)))
+(define-public (wireguard-service host-name)
+  (let ((own-peer (assoc-ref %wireguard-peers host-name)))
     (service wireguard-service-type
       (wireguard-configuration
        (addresses