uncloud/uncloud_etcd_based/docs/source/admin-guide.rst
2020-04-02 19:29:08 +02:00

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.. _admin-guide:
Usage Guide For Administrators
==============================
Start API
----------
.. code-block:: sh
ucloud api
Host Creation
-------------
Currently, we don't have any host (that runs virtual machines).
So, we need to create it by executing the following command
.. code-block:: sh
ucloud-cli host create --hostname ungleich.ch --cpu 32 --ram '32GB' --os-ssd '32GB'
You should see something like the following
.. code-block:: json
{
"message": "Host Created"
}
Start Scheduler
---------------
Scheduler is responsible for scheduling VMs on appropriate host.
.. code-block:: sh
ucloud scheduler
Start Host
----------
Host is responsible for handling the following actions
* Start VM.
* Stop VM.
* Create VM.
* Delete VM.
* Migrate VM.
* Manage Network Resources needed by VMs.
It uses a hypervisor such as QEMU to perform these actions.
To start host we created earlier, execute the following command
.. code-block:: sh
ucloud host ungleich.ch
File & image scanners
--------------------------
Let's assume we have uploaded an *alpine-uploaded.qcow2* disk images to our
uncloud server. Currently, our *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
.. code-block:: sh
ucloud filescanner
File Scanner would run, scan your uploaded image and track it. You can check whether your image
is successfully tracked by executing the :code:`ucloud-cli user files`, It will return something like the following
.. _list-user-files:
.. code-block:: json
{
"message": [
{
"filename": "alpine-untouched.qcow2",
"uuid": "3f75bd20-45d6-4013-89c4-7fceaedc8dda"
}
]
}
Our file is now being tracked by ucloud. Lets create an OS image using the uploaded file.
An image belongs to an image store. There are two types of store
* Public Image Store
* Private Image Store (Not Implemented Yet)
.. note::
**Quick Quiz** Have we created an image store yet?
The answer is **No, we haven't**. Creating a sample image store is very easy.
Just execute the following command
.. code-block:: sh
(cd ~/ucloud && pipenv run python api/create_image_store.py)
An image store (with name = "images") would be created. Now, we are fully ready for creating our
very own image. Executing the following command to create image using the file uploaded earlier
.. code-block:: sh
ucloud-cli image create-from-file --name alpine --uuid 3f75bd20-45d6-4013-89c4-7fceaedc8dda --image-store-name images
Please note that your **uuid** would be different. See :ref:`List of user files <list-user-files>`.
Now, ucloud have received our request to create an image from file. We have to run Image Scanner to make the image.
.. code-block:: sh
ucloud imagescanner
To make sure, that our image is create run :code:`ucloud-cli image list --public`. You would get
output something like the following
.. code-block:: json
{
"images": [
{
"name": "images:alpine",
"status": "CREATED"
}
]
}