Create enable-test-s3-service.rst

Created how-to for starting the S3 RST service, configuring a user, creating a bucket and inserting a file.

docs/how-to/enable-test-s3-service.rst

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+=======================================
+Testing the Ceph S3-Compatible Endpoint
+=======================================
+
+Ceph provides an S3-compatible service. While the service is REST-based, it 
+is tedious to test by hand with `curl` or other tools, as the S3 protocol 
+requires that requests are *signed* by ordering the headers and creating a 
+hash. While easy-to-use tools are available, many assume the provider is Amazon
+and may be difficult to change. 
+[Amazon S3 Documentation](https://docs.aws.amazon.com/AmazonS3/latest/userguide/RESTAuthentication.html#ConstructingTheAuthenticationHeader)
+
+This how-to covers:
+* Required services in microceph
+* Creating authorized users
+* Installing and configuring the `s3cmd` tool
+* Creating a bucket, adding a file and removing the file and bucket
+
+Important Considerations
+------------------------
+
+There are two ways to reference an S3 bucket: *path-style* and *virtual
+hosted-style*. Amazon has stated a preference to deprecate *path-style*,
+but as of September 2020 has decided to delay the deprecation.
+[Amazon S3 Documentation](https://docs.aws.amazon.com/AmazonS3/latest/userguide/RESTAPI.html#virtual-hosted-path-style-requests)
+[Amazon S3 Blog](https://aws.amazon.com/blogs/aws/amazon-s3-path-deprecation-plan-the-rest-of-the-story/)
+
+Currently, ***Microceph supports only path-style bucket references.*** 
+
+Prerequisites
+-------------
+
+This guide assumes that Microceph has been installed and confiugred as
+specified in this guide. Also, that the [enable service instances](enable-service-instances/)
+guide has been followed to create the RGW service.
+
+Create RADOS user
+-----------------
+
+On the Microceph node, use the :command:`radosgw-admin` tool.
+
+.. code-block:: none
+
+   admin@ceph-lab:~$ sudo radosgw-admin user create --uid=[userid] --display-name="[displayname]"
+
+Where [userid] and [displayname] are replaced with appropriate values.
+
+This will return a JSON object:
+.. code-block:: JSON
+:emphasize-lines: 11,12
+
+   {
+      "user_id": "[userid]",
+      "display_name": "[displayname]",
+      "email": "",
+      "suspended": 0,
+      "max_buckets": 1000,
+      "subusers": [],
+      "keys": [
+      {
+         "user": "tanzu",
+         "access_key": "[20-char text string]",
+         "secret_key": "[40-char text string]"
+      }
+      ],
+      "swift_keys": [],
+      "caps": [],
+      "op_mask": "read, write, delete",
+      "default_placement": "",
+      "default_storage_class": "",
+      "placement_tags": [],
+      "bucket_quota": 
+      {
+         "enabled": false,
+         "check_on_raw": false,
+         "max_size": -1,
+         "max_size_kb": 0,
+         "max_objects": -1
+      },
+      "user_quota": 
+      {
+         "enabled": false,
+         "check_on_raw": false,
+         "max_size": -1,
+         "max_size_kb": 0,
+         "max_objects": -1
+      },
+      "temp_url_keys": [],
+      "type": "rgw",
+      "mfa_ids": []
+   }
+
+Copy the **keys** data, specifically **keys.access_key** and **keys.secret_key**.
+
+Install and Configure s3cmd
+---------------------------
+
+S3cmd is a Python-based tool created and open-sourced by s3tools.org [s3tools.org/s3cmd](https://s3tools.org/s3cmd)
+and may be [downloaded here](https://sourceforge.net/projects/s3tools/files/s3cmd/).
+
+After s3cmd is installed and verified by :command:`s3cmd --version`, configure 
+s3cmd with the built-in tool that will go through a series of questions:
+:command:`s3cmd --configure`
+
+1. Access key
+
+Enter the access key copied from **keys.access_key** above. If these keys are 
+lost, they can be retrieved by an administrator with
+
+.. code-block:: none
+
+   admin@ceph-lab:~$ sudo radosgw-admin user info --uid=[userid]
+
+1. Secret key
+
+Enter the secret key copied from **keys.secret_key** above.
+
+1. Default region
+
+Press enter to accept the default.
+
+1. S3 Endpoint
+
+This is URL or IP Address to your Microceph server. Example: **ceph.lab.example.com**
+or **172.16.1.100**
+
+(Naturally, if a DNS name is used istead of an IP, there must be a DNS entry or
+hosts file entry made in the appropriate place to resolve the name.)
+
+1. DNS-style bucket+hostname:port template
+
+***Important*** This is where the virtual-host-style requests are configured.
+Since Microceph does not yet support this, enter the *same value as the S3 
+endpoint*, e.g. ceph.lab.example.com or 172.16.1.100
+
+1. Encryption, GPG, Use HTTPS, HTTP Proxy
+
+For this test, enter blank for all, except HTTPS: enter No.
+
+1. Test access
+
+Press enter to test connectivity. This will check that the S3 endpoint is 
+reachable, the user exists, and the access_key and secret_key are valid.
+It does not exercise the bucket specification or the rights of the user.
+
+1. Save settings
+
+Enter Y to save the settings to ~/.s3cfg. Other parameters can be edited
+in that file, but these are enough for the test.
+
+
+Test Using the Bucket
+---------------------
+
+Create a bucket. Bucket names have specific rules about length, case and 
+characters. Generally, they must be 3-63 characters, lowercase letters, 
+numbers, dots . and hyphens -. The protocol must be specified in lower
+case.
+
+:command:`s3cmd mb s3://test`
+
+A message that the bucket is created should appear.
+
+:command:`s3cmd put [filename] s3://test`
+
+Upload statistics should appear.
+
+:command:`s3cmd del s3://test/[filename]`
+
+Delete message should appear.
+
+:command:`s3cmd rb s3://test`
+
+Removed message should appear.
+
+
+.. LINKS
+
+.. _Manager service: https://docs.ceph.com/en/latest/mgr/
+.. _Monitor service: https://docs.ceph.com/en/latest/man/8/ceph-mon/
+.. _Metadata service: https://docs.ceph.com/en/latest/man/8/ceph-mds/
+.. _RADOS Gateway service: https://docs.ceph.com/en/latest/radosgw/