Remove ucloud_common and put its files under ucloud.common subpackage.

Remove individual config.py used by every component and put them into single config.py ucloud/config.py
Use /etc/ucloud/ucloud.conf for Environment Variables
Refactoring and a lot of it
Make ucloud repo a package and different components of ucloud a subpackage for avoiding code duplication.
Improved logging.

docs/source/conf.py

@@ -21,7 +21,6 @@ project = 'ucloud'
 copyright = '2019, ungleich'
 author = 'ungleich'
 
-
 # -- General configuration ---------------------------------------------------
 
 # Add any Sphinx extension module names here, as strings. They can be
@@ -39,7 +38,6 @@ templates_path = ['_templates']
 # This pattern also affects html_static_path and html_extra_path.
 exclude_patterns = []
 
-
 # -- Options for HTML output -------------------------------------------------
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for
@@ -50,4 +48,4 @@ html_theme = 'alabaster'
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
-html_static_path = ['_static']
+html_static_path = ['_static']

docs/source/index.rst

@@ -1,7 +1,7 @@
 .. ucloud documentation master file, created by
-   sphinx-quickstart on Mon Nov 11 19:08:16 2019.
-   You can adapt this file completely to your liking, but it should at least
-   contain the root `toctree` directive.
+sphinx-quickstart on Mon Nov 11 19:08:16 2019.
+You can adapt this file completely to your liking, but it should at least
+contain the root `toctree` directive.
 
 Welcome to ucloud's documentation!
 ==================================
@@ -15,7 +15,7 @@ Welcome to ucloud's documentation!
    usage/usage-for-admins
    usage/usage-for-users
    usage/how-to-create-an-os-image-for-ucloud
-
+   misc/todo
 
 Indices and tables
 ==================

docs/source/introduction/installation.rst

@@ -36,6 +36,9 @@ Enable Edge Repos, Update and Upgrade
 
 Install Dependencies
 ~~~~~~~~~~~~~~~~~~~~
+.. note::
+    The installation and configuration of a production grade etcd cluster
+    is out of scope of this manual. So, we will install etcd with default configuration.
 
 .. code-block:: sh
     :linenos:

docs/source/misc/todo.rst

@@ -0,0 +1,7 @@
+TODO
+====
+
+* Check for :code:`etcd3.exceptions.ConnectionFailedError` when calling some etcd operation to
+  avoid crashing whole application.
+* Throw KeyError instead of returning None when some key is not found in etcd.
+* Expose more details in ListUserFiles.

docs/source/usage/usage-for-admins.rst

@@ -55,7 +55,28 @@ To start host we created earlier, execute the following command
 
 Create OS Image
 ---------------
-First, we need to upload the file.
+
+Create ucloud-init ready OS image (Optional)
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+This step is optional if you just want to test ucloud. However, sooner or later
+you want to create OS images with ucloud-init to properly
+contexualize VMs.
+
+1. Start a VM with OS image on which you want to install ucloud-init
+2. Execute the following command on the started VM
+
+   .. code-block:: sh
+
+    apk add git
+    git clone https://code.ungleich.ch/ucloud/ucloud-init.git
+    cd ucloud-init
+    sh ./install.sh
+3. Congratulations. Your image is now ucloud-init ready.
+
+
+Upload Sample OS Image
+~~~~~~~~~~~~~~~~~~~~~~
+Execute the following to upload the sample OS image file.
 
 .. code-block:: sh
 
@@ -63,7 +84,7 @@ First, we need to upload the file.
     (cd /var/www/admin && wget http://[2a0a:e5c0:2:12:0:f0ff:fea9:c3d9]/alpine-untouched.qcow2)
 
 Run File Scanner and Image Scanner
-------------------------------------
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Currently, our uploaded file *alpine-untouched.qcow2* is not tracked by ucloud. We can only make
 images from tracked files. So, we need to track the file by running File Scanner