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diff --git a/gnu/services/certbot.scm b/gnu/services/certbot.scm
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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2016 ng0 <ng0@we.make.ritual.n0.is>
+;;; Copyright © 2016 Sou Bunnbu <iyzsong@member.fsf.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu services certbot)
+  #:use-module (gnu services)
+  #:use-module (gnu services base)
+  #:use-module (gnu services shepherd)
+  #:use-module (gnu services mcron)
+  #:use-module (gnu services web)
+  #:use-module (gnu system shadow)
+  #:use-module (gnu packages tls)
+  #:use-module (guix records)
+  #:use-module (guix gexp)
+  #:use-module (srfi srfi-1)
+  #:use-module (ice-9 match)
+  #:export (certbot-service-type
+            certbot-configuration
+            certbot-configuration?))
+
+;;; Commentary:
+;;;
+;;; Automatically obtaining TLS certificates from Let's Encrypt.
+;;;
+;;; Code:
+
+
+(define-record-type* <certbot-configuration>
+  certbot-configuration make-certbot-configuration
+  certbot-configuration?
+  (package             certbot-configuration-package
+                       (default certbot))
+  (webroot             certbot-configuration-webroot
+                       (default "/var/www"))
+  (hosts               certbot-configuration-hosts
+                       (default '()))
+  (default-location    certbot-configuration-default-location
+                       (default
+                         (nginx-location-configuration
+                          (uri "/")
+                          (body
+                           (list "return 301 https://$host$request_uri;"))))))
+
+(define certbot-renewal-jobs
+  (match-lambda
+    (($ <certbot-configuration> package webroot hosts default-location)
+     (match hosts
+       ;; Avoid pinging certbot if we have no hosts.
+       (() '())
+       (_
+        (list
+         ;; Attempt to renew the certificates twice a week.
+         #~(job (lambda (now)
+                  (next-day-from (next-hour-from now '(3))
+                                 '(2 5)))
+                (string-append #$package "/bin/certbot renew"
+                               (string-concatenate
+                                (map (lambda (host)
+                                       (string-append " -d " host))
+                                     #$hosts))))))))))
+
+(define certbot-activation
+  (match-lambda
+    (($ <certbot-configuration> package webroot hosts default-location)
+     (with-imported-modules '((guix build utils))
+       #~(begin
+	   (use-modules (guix build utils))
+	   (mkdir-p #$webroot)
+           (for-each
+            (lambda (host)
+              (unless (file-exists? (in-vicinity "/etc/letsencrypt/live" host))
+                (unless (zero? (system*
+                                (string-append #$certbot "/bin/certbot")
+                                "certonly" "--webroot" "-w" #$webroot
+                                "-d" host))
+                  (error "failed to acquire cert for host" host))))
+            '#$hosts))))))
+
+(define certbot-nginx-server-configurations
+  (match-lambda
+    (($ <certbot-configuration> package webroot hosts default-location)
+     (map
+      (lambda (host)
+        (nginx-server-configuration
+         (http-port 80)
+         (https-port #f)
+         (ssl-certificate #f)
+         (ssl-certificate-key #f)
+         (server-name (list host))
+         (locations
+          (filter identity
+                  (list
+                   (nginx-location-configuration
+                    (uri "/.well-known")
+                    (body (list (list "root " webroot ";"))))
+                   default-location)))))
+      hosts))))
+
+(define certbot-service-type
+  (service-type (name 'certbot)
+                (extensions
+                 (list (service-extension nginx-service-type
+                                          certbot-nginx-server-configurations)
+                       (service-extension activation-service-type
+                                          certbot-activation)
+                       (service-extension mcron-service-type
+                                          certbot-renewal-jobs)))
+                (compose concatenate)
+                (extend (lambda (config additional-hosts)
+                          (certbot-configuration
+                           (inherit config)
+                           (hosts (append (certbot-configuration-hosts config)
+                                          additional-hosts)))))))