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+;;; Databases service definitions for PantherX
+;;; Author: Reza Alizadeh Majd (r.majd@pantherx.org)
+
+
+(define-module (px services databases)
+  #:use-module (gnu services)
+  #:use-module (gnu services shepherd)
+  #:use-module (gnu system shadow)
+  #:use-module (gnu packages admin)
+  #:use-module (guix modules)
+  #:use-module (guix records)
+  #:use-module (guix gexp)
+  #:use-module (px packages databases)
+  #:use-module (srfi srfi-1)
+  #:use-module (ice-9 match)
+  #:export (mongodb-configuration
+            mongodb-configuration?
+            mongodb-configuration-mongodb
+            mongodb-configuration-config-file
+            mongodb-configuration-data-directory
+            mongodb-service-type))
+
+
+;;;
+;;; MongoDB
+;;;
+;;; @subsubheading MongoDB
+;;; @defvr {Scheme Variable} mongodb-service-type
+;;; This is the service type for @uref{https://www.mongodb.com/, MongoDB}.
+;;; The value for the service type is a @code{mongodb-configuration} object.
+;;; @end defvr
+;;; @lisp
+;;; (service mongodb-service-type)
+;;; @end lisp
+;;; @deftp {Data Type} mongodb-configuration
+;;; Data type representing the configuration of mongodb.
+;;; @table @asis
+;;; @item @code{mongodb} (default: @code{mongodb})
+;;; The MongoDB package to use.
+;;; @item @code{config-file} (default: @code{%default-mongodb-configuration-file})
+;;; The configuration file for MongoDB.
+;;; @item @code{data-directory} (default: @code{"/var/lib/mongodb"})
+;;; This value is used to create the directory, so that it exists and is
+;;; owned by the mongodb user.  It should match the data-directory which
+;;; MongoDB is configured to use through the configuration file.
+;;; @end table
+;;; @end deftp
+
+
+(define %default-mongodb-configuration-file
+  (plain-file
+   "mongodb.yaml"
+   "# GNU Guix: MongoDB default configuration file
+processManagement:
+  pidFilePath: /var/run/mongodb/pid
+storage:
+  dbPath: /var/lib/mongodb
+"))
+
+
+(define-record-type* <mongodb-configuration>
+  mongodb-configuration make-mongodb-configuration
+  mongodb-configuration?
+  (mongodb             mongodb-configuration-mongodb
+                       (default mongodb))
+  (config-file         mongodb-configuration-config-file
+                       (default %default-mongodb-configuration-file))
+  (data-directory      mongodb-configuration-data-directory
+                       (default "/var/lib/mongodb")))
+
+(define %mongodb-accounts
+  (list (user-group (name "mongodb") (system? #t))
+        (user-account
+         (name "mongodb")
+         (group "mongodb")
+         (system? #t)
+         (comment "Mongodb server user")
+         (home-directory "/var/lib/mongodb")
+         (shell (file-append shadow "/sbin/nologin")))))
+
+(define mongodb-activation
+  (match-lambda
+    (($ <mongodb-configuration> mongodb config-file data-directory)
+     #~(begin
+         (use-modules (guix build utils))
+         (let ((user (getpwnam "mongodb")))
+           (for-each
+            (lambda (directory)
+              (mkdir-p directory)
+              (chown directory
+                     (passwd:uid user) (passwd:gid user)))
+            '("/var/run/mongodb" #$data-directory)))))))
+
+(define mongodb-shepherd-service
+  (match-lambda
+    (($ <mongodb-configuration> mongodb config-file data-directory)
+     (shepherd-service
+      (provision '(mongodb))
+      (documentation "Run the Mongodb daemon.")
+      (requirement '(user-processes loopback))
+      (start #~(make-forkexec-constructor
+                `(,(string-append #$mongodb "/bin/mongod")
+                  "--config"
+                  ,#$config-file)
+                #:user "mongodb"
+                #:group "mongodb"
+                #:pid-file "/var/run/mongodb/pid"
+                #:log-file "/var/log/mongodb.log"))
+      (stop #~(make-kill-destructor))))))
+
+(define mongodb-service-type
+  (service-type
+   (name 'mongodb)
+   (description "Run the MongoDB document database server.")
+   (extensions
+    (list (service-extension shepherd-root-service-type
+                             (compose list
+                                      mongodb-shepherd-service))
+          (service-extension activation-service-type
+                             mongodb-activation)
+          (service-extension account-service-type
+                             (const %mongodb-accounts))))
+   (default-value
+     (mongodb-configuration))))
+
+
+(use-modules (gnu system)
+             (gnu bootloader)
+             (gnu bootloader grub)
+             (gnu system file-systems)
+             (px system config))
+