DOCSP-9647 add command to determine init system

source/includes/fact-systemd-vs-initd.rst

@@ -1,8 +1,22 @@
 To run and manage your :binary:`~bin.mongod` process, you will be using
-your operating system's built-in initialization system. Recent versions
-of Linux tend to use **systemd** (which uses the ``systemctl`` command),
+your operating system's built-in :term:`init system`. Recent versions of
+Linux tend to use **systemd** (which uses the ``systemctl`` command),
 while older versions of Linux tend to use **System V init** (which uses
-the ``service`` command). Refer to the documentation for your operating
-system for more information.
+the ``service`` command).
 
-Use the initialization system appropriate for your platform:
+If you are unsure which init system your platform uses, run the
+following command:
+
+.. container::
+
+   .. code-block:: sh
+
+      ps --no-headers -o comm 1
+
+Then select the appropriate tab below based on the result:
+
+- ``systemd`` - select the **systemd (systemctl)** tab below.
+
+- ``init`` - select the **System V Init (service)** tab below.
+
+|

source/reference/glossary.txt

@@ -181,12 +181,25 @@ Glossary
       See :ref:`sharding-config-server`.
 
    init script
-      A simple shell script used by a Linux system's initialization
-      process to start, restart or stop a :term:`daemon` process. If you
-      installed MongoDB via a package manager, an init script
-      has been provided for your system as part of the installation. See
-      the respective :doc:`Installation Guide </installation>` for your
-      operating system.
+      A simple shell script used by a Linux platform's
+      :term:`init system` to start, restart, or stop a :term:`daemon`
+      process. If you installed MongoDB via a package manager, an init
+      script has been provided for your system as part of the
+      installation. See the respective
+      :doc:`Installation Guide </installation>` for your operating
+      system.
+
+   init system
+      The init system is the first process started on a Linux platform
+      after the kernel starts, and manages all other processes on the
+      system. The init system uses an :term:`init script` to start,
+      restart, or stop a :term:`daemon` process, such as
+      :binary:`~bin.mongod` or :binary:`~bin.mongos`. Recent versions of
+      Linux tend to use the **systemd** init system, which uses the
+      ``systemctl`` command, while older versions tend to use the
+      **System V** init system, which uses the ``service`` command.
+      See the respective :doc:`Installation Guide </installation>` for
+      your operating system.
 
    CRUD
       An acronym for the fundamental operations of a database: Create,
@@ -509,20 +522,24 @@ Glossary
       type to describe a file inserted into :term:`GridFS` storage.
 
    mongo
-      The MongoDB shell. The :binary:`~bin.mongo` process starts the MongoDB
-      shell as a daemon connected to either a :binary:`~bin.mongod` or
-      :binary:`~bin.mongos` instance. The shell has a JavaScript interface.
-      See :doc:`/reference/program/mongo` and :doc:`/reference/method`.
+      The MongoDB shell. The :binary:`~bin.mongo` process starts the
+      MongoDB shell as a :term:`daemon` connected to either a
+      :binary:`~bin.mongod` or :binary:`~bin.mongos` instance. The shell
+      has a JavaScript interface. See :doc:`/reference/program/mongo`
+      and :doc:`/reference/method`.
 
    mongod
-      The MongoDB database server. The :binary:`~bin.mongod` process starts
-      the MongoDB server as a daemon. The MongoDB server manages data
-      requests and formats and manages background operations. See
-      :doc:`/reference/program/mongod`.
+      The MongoDB database server. The :binary:`~bin.mongod` process
+      starts the MongoDB server as a :term:`daemon`. The MongoDB server
+      manages data requests and formats and manages background
+      operations. See :doc:`/reference/program/mongod`.
 
    mongos
-      The routing and load balancing process that acts an interface
-      between an application and a MongoDB :term:`sharded cluster`. See
+      The MongoDB sharded cluster query router. The
+      :binary:`~bin.mongos` process starts the MongoDB router as a
+      :term:`daemon`. The MongoDB router acts as an interface
+      between an application and a MongoDB :term:`sharded cluster` and
+      handles all routing and load balancing across the cluster.  See
       :doc:`/reference/program/mongos`.
 
    namespace

source/tutorial/install-mongodb-enterprise-on-amazon.txt

@@ -89,6 +89,8 @@ Procedure
 Follow these steps to run MongoDB |edition| Edition. These instructions
 assume that you are using the default settings.
 
+**Init System**
+
 .. include:: /includes/fact-systemd-vs-initd.rst
 
 .. tabs::

source/tutorial/install-mongodb-enterprise-on-debian.txt

@@ -81,6 +81,8 @@ These instructions assume that you are using the official |package-name|
 package -- not the unofficial ``mongodb`` package provided by
 |distro-name| --  and are using the default settings.
 
+**Init System**
+
 .. include:: /includes/fact-systemd-vs-initd.rst
 
 .. tabs::

source/tutorial/install-mongodb-enterprise-on-red-hat.txt

@@ -153,6 +153,8 @@ Procedure
 Follow these steps to run MongoDB |edition| Edition on your system.
 These instructions assume that you are using the default settings.
 
+**Init System**
+
 .. include:: /includes/fact-systemd-vs-initd.rst
 
 .. tabs::

source/tutorial/install-mongodb-enterprise-on-suse.txt

@@ -72,6 +72,8 @@ Procedure
 Follow these steps to run MongoDB |edition| Edition. These instructions
 assume that you are using the default settings.
 
+**Init System**
+
 .. include:: /includes/fact-systemd-vs-initd.rst
 
 .. tabs::

source/tutorial/install-mongodb-enterprise-on-ubuntu.txt

@@ -85,6 +85,8 @@ These instructions assume that you are using the official |package-name|
 package -- not the unofficial ``mongodb`` package provided by
 |distro-name| --  and are using the default settings.
 
+**Init System**
+
 .. include:: /includes/fact-systemd-vs-initd.rst
 
 .. tabs::

source/tutorial/install-mongodb-on-amazon.txt

@@ -89,6 +89,8 @@ Procedure
 Follow these steps to run MongoDB |edition| Edition. These instructions
 assume that you are using the default settings.
 
+**Init System**
+
 .. include:: /includes/fact-systemd-vs-initd.rst
 
 .. tabs::

source/tutorial/install-mongodb-on-debian.txt

@@ -81,6 +81,8 @@ These instructions assume that you are using the official |package-name|
 package -- not the unofficial ``mongodb`` package provided by
 |distro-name| --  and are using the default settings.
 
+**Init System**
+
 .. include:: /includes/fact-systemd-vs-initd.rst
 
 .. tabs::

source/tutorial/install-mongodb-on-red-hat.txt

@@ -149,6 +149,8 @@ Procedure
 Follow these steps to run MongoDB |edition| Edition on your system.
 These instructions assume that you are using the default settings.
 
+**Init System**
+
 .. include:: /includes/fact-systemd-vs-initd.rst
 
 .. tabs::

source/tutorial/install-mongodb-on-suse.txt

@@ -70,6 +70,8 @@ Procedure
 Follow these steps to run MongoDB |edition| Edition. These instructions
 assume that you are using the default settings.
 
+**Init System**
+
 .. include:: /includes/fact-systemd-vs-initd.rst
 
 .. tabs::

source/tutorial/install-mongodb-on-ubuntu.txt

@@ -104,6 +104,8 @@ These instructions assume that you are using the official |package-name|
 package -- not the unofficial ``mongodb`` package provided by
 |distro-name| --  and are using the default settings.
 
+**Init System**
+
 .. include:: /includes/fact-systemd-vs-initd.rst
 
 .. tabs::