Fix requirements topic document

docs/guides/requirements.rst

@@ -1,41 +0,0 @@
-.. _requirements:
-
-===================
-Server Requirements
-===================
-
-Operating System
-================
-
-We recommend using Ubuntu 18.04 as the base operating system for your server.
-Ubuntu 16.04 should also work, but is not officially supported. other Linux
-distributions and operating systems are also not officially supported.
-
-Root access
-===========
-
-Full ``root`` access to this server is required. This might be via ``sudo``
-(recommended) or by direct access to ``root`` (not recommended!)
-
-External IP
-===========
-
-An external IP allows users on the internet to reach your JupyterHub. Most
-VPS / Cloud providers give you a public IP address along with your server. If
-you are hosting on a physical machine somewhere, talk to your system administrators
-about how to get HTTP traffic from the world into your server.
-
-Memory (RAM)
-============
-
-RAM is often the biggest limiting factor to the question 'how many users can use this JupyterHub
-at the same time?'. If you want to support ``N`` maximum concurrent active users
-each able to use up to ``X`` GB of RAM, you will need:
-
-.. math::
-
-    Server RAM = ($N \times X) + 128MB
-
-The 128MB buffer is for system services (including JupyterHub itself).
-This will guarantee that your server will not run out of RAM as long
-as you have no more than ``N`` active users.

docs/index.rst

@@ -54,7 +54,7 @@ Topic guides provide in-depth explanations of specific topics.
 .. toctree::
    :titlesonly:
 
-   guides/requirements
+   topic/requirements
    guides/admin
    topic/security
    topic/customizing-installer

docs/topic/requirements.rst

@@ -0,0 +1,29 @@
+.. _requirements:
+
+===================
+Server Requirements
+===================
+
+Operating System
+================
+
+We require using Ubuntu 18.04 as the base operating system for your server.
+
+Root access
+===========
+
+Full ``root`` access to this server is required. This might be via ``sudo``
+(recommended) or by direct access to ``root`` (not recommended!)
+
+External IP
+===========
+
+An external IP allows users on the internet to reach your JupyterHub. Most
+VPS / Cloud providers give you a public IP address along with your server. If
+you are hosting on a physical machine somewhere, talk to your system administrators
+about how to get HTTP traffic from the world into your server.
+
+CPU / Memory / Disk Space
+=========================
+
+See how to ref:`howto/resource-estimation`