Windows 10 Python Django Tutorial - Writing your first app

1)
Create a project

>django-admin startproject mysite

>dir mysite

>dir mysite\mysite

2)
Create default database and tables

>cd mysite

>python manage.py migrate

3)
Check default sqllite3 database "db.sqllite3"

>dir

4)
Verify your Django project.

a)
Run development server
>python manage.py runserver

b)
Goto http://127.0.0.1:8000/

How To Install Python and Virtualenv In Windows 10

1)
INSTALL PYTHON
---------------------------
a)
Goto https://www.python.org/downloads/

b)

Download and Install Python

c)

Open command prompt and type python to verify the installation

2)
INSTALL VIRTUALENV
-------------------------------------
a)
Goto https://pypi.python.org/pypi/virtualenv

b)
download virtualenv-13.1.2.tar.gz (md5, pgp)

c)
Extract "virtualenv-13.1.2.tar.gz"

d)
Open command prompt then cd to following path
>cd C:\Users\anusree\Downloads\dist\virtualenv-13.1.2

e)
Install virtualenv
>python setup.py install

3)

CREATE AND ACTIVATE VIRTUALENVIRONMENT
-----------------------------------------------------------------------------
a)
Create virtualenv named "myenv"
>python -m virtualenv myenv
>dir

b)
Activate virtualenvironment "myenv"
>C:\Users\anusree>.\myenv\Scripts\activate
(myenv) C:\Users\anusree>

How to Install Python and Django on Windows 10

1)
INSTALL PYTHON
---------------------------
a)
Goto https://www.python.org/downloads/

b)

Download and Install Python

c)

Open command prompt and type python to verify the installation

2)
INSTALL VIRTUALENV
-------------------------------------
a)
Goto https://pypi.python.org/pypi/virtualenv

b)
download virtualenv-13.1.2.tar.gz (md5, pgp)

c)
Extract "virtualenv-13.1.2.tar.gz"

d)
Open command prompt then cd to following path
>cd C:\Users\anusree\Downloads\dist\virtualenv-13.1.2

e)
Install virtualenv
>python setup.py install

3)

CREATE AND ACTIVATE VIRTUALENVIRONMENT
-----------------------------------------------------------------------------
a)
Create virtualenv named "myenv"
>python -m virtualenv myenv
>dir

b)
Activate virtualenvironment "myenv"
>C:\Users\anusree>.\myenv\Scripts\activate
(myenv) C:\Users\anusree>


4)
INSTALL DJANGO
-----------------------------
a)
Install Django
(myenv) C:\Users\anusree>pip install django
Collecting django
  Downloading Django-1.8.5-py2.py3-none-any.whl (6.2MB)
    100% |################################| 6.2MB 48kB/s
Installing collected packages: django
Successfully installed django-1.8.5
(myenv) C:\Users\anusree>

b)
Verify the installation of Django
(myenv) C:\Users\anusree>python
Python 2.7.10 (default, May 23 2015, 09:40:32) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>>
>>> import django
>>>

How to Install Django on Windows 10

1)INSTALL VIRTUALENV
-------------------------------------
a)
goto https://pypi.python.org/pypi/virtualenv

b)
download virtualenv-13.1.2.tar.gz (md5, pgp)

c)
Extract "virtualenv-13.1.2.tar.gz"

d)
Open command prompt then cd to following path
>cd C:\Users\anusree\Downloads\dist\virtualenv-13.1.2

e)
install virtualenv
>python setup.py install

2)CREATE AND ACTIVATE VIRTUALENVIRONMENT
-----------------------------------------------------------------------------

a)
create virtualenv named "myenv"
>python -m virtualenv myenv
>dir

b)
activate virtualenvironment "myenv"
>C:\Users\anusree>.\myenv\Scripts\activate
(myenv) C:\Users\anusree>


3)INSTALL DJANGO
-----------------------------

a)
install Django
(myenv) C:\Users\anusree>pip install django
Collecting django
  Downloading Django-1.8.5-py2.py3-none-any.whl (6.2MB)
    100% |################################| 6.2MB 48kB/s
Installing collected packages: django
Successfully installed django-1.8.5
(myenv) C:\Users\anusree>

b)
verify
(myenv) C:\Users\anusree>python
Python 2.7.10 (default, May 23 2015, 09:40:32) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>>
>>> import django
>>>

How to Manage Users and Groups in Linux via Terminal

      How to Manage Users and Groups in Linux via Terminal

 
1)
Add new group named "school"

            anusree@anusree-VirtualBox:~$ sudo groupadd school

2)
List the group that created in above step.

           anusree@anusree-VirtualBox:~$ cat /etc/group

3)
Add two users named "students" and "staffs"

             anusree@anusree-VirtualBox:~$ sudo useradd -m students
             anusree@anusree-VirtualBox:~$ sudo useradd -m staffs
  

-m option is used for crate the home directory at the time of user is created.

4)
List the users that created in the above step.

             anusree@anusree-VirtualBox:~$ cat /etc/passwd

5)
Then, add the existing users "students" and "staffs" to the group "school".

               anusree@anusree-VirtualBox:~$ sudo adduser students school
               Adding user `students' to group `school' ...
               Adding user students to group school
               Done.
               anusree@anusree-VirtualBox:~$ sudo adduser staffs school
               Adding user `staffs' to group `school' ...
               Adding user staffs to group school
               Done.
                anusree@anusree-VirtualBox:~$

After adding users to the group then list the name of groups then we can see the changes..

6)
Delete the user.

              anusree@anusree-VirtualBox:~$ sudo userdel -r students         
              anusree@anusree-VirtualBox:~$ sudo userdel -r staffs

 -r option is used for delete the user with its home directory 

7)
Delete the group.

             anusree@anusree-VirtualBox:~$ sudo groupdel school

How to create a virtual machine using openstack nova python client

1) First create python nova client object

from novaclient.v2 import client
USER = "admin"
PASS = "cloud"
TENANT = "admin"
AUTH_URL = "http://192.168.56.101:5000/v2.0/"
nova_conn = client.Client(USER, PASS, TENANT, AUTH_URL, service_type="compute")

Explanation:

#import client from novaclient.v2, since the class "Client" defined in client.py.
#https://github.com/openstack/python-novaclient/blob/master/novaclient/v2/client.py#L52
from novaclient.v2 import client

#Declare username, password, tenant/project and auth_url
#AUTH_URL tells where the authentication service (keystone) is running.
USER = "admin"
PASS = "cloud"
TENANT = "admin"
AUTH_URL = "http://192.168.56.101:5000/v2.0/"


#Create a object of class Client (create a connection to nova).
nova_conn = client.Client(USER, PASS, TENANT, AUTH_URL, service_type="compute")

 2) Create a vm

a) Find image id:

 >>> [(x.name, x.id) for x in nova_conn.images.list()]

b) Find flavor id:

>>> [(x.name, x.id) for x in nova_conn.flavors.list()]

c) Create a vm named "myvm2"

>>> nova_conn.servers.create("myvm2", "b935b518-8bed-4947-91ae-a2ed78f591e6", "1")

• b935b518-8bed-4947-91ae-a2ed78f591e6  --->  id of image "newimage"
• 1 --->  id of flavor "m1.tiny"

d) List all vms

>>> [(x.name,x.id) for x in nova_conn.servers.list()]

3) How to find methods and attributes:

a) Find methods and attribute of "nova_conn".

>>> dir(nova_conn)

 b) Find methods and attribute of "nova_conn.servers".

>>> dir(nova_conn.servers)

 4) How to get help page.

a)find help of "nova_conn.servers.create".

>>> help(nova_conn.servers.create)

Python How to Install and activate Virtualenv

How to Install and activate Virtualenv

1) Install virtualenv

           $ sudo apt-get install python-virualenv

2) Create virtual environment for our project

          $ virtualenv myenv

virtualenv venv will create a folder in the current directory which will contain the Python executable files. The name of virtualenv is "myenv".

3) To begin using the virtual environment, it needs to be activated

           $ source myenv/bin/activate

The name of the current virtual environment will now appear on the left of the prompt.Like this ,

(myenv)anusree@anusree-Inspiron-5547:~/my_project_folder$


If you want to install any python packages inside the virtual environment then do not use the command: "$ sudo apt-get install packagename".

I am going to show you install python package "django" inside the virtual environment "myenv" using command "$ pip install django" and don't  use     "$ sudo" command before "$ pip" command:

            $ pip install django

4) If you are done working in the virtual environment for the moment, you can deactivate it:

$ deactivate

The packages which i am installing into virtual environment "myenv" are stored in "myenv/lib/python2.7/site-packages"

In this screenshot you can see the package "django" i installed.

OpenStack Keystone Operations Using CLI

Keystone Operations using CLI

1) Create a project

anusreee@anusreee-VirtualBox:~/devstack$ keystone tenant-create --name accounting

Then list of all project using the command:

anusreee@anusreee-VirtualBox:~/devstack$ keystone tenant-list

2) Create a user

 anusreee@anusreee-VirtualBox:~/devstack$ keystone user-create --name mily --pass mily123 --enabled true

Then list all the users using the command :

anusreee@anusreee-VirtualBox:~/devstack$ keystone user-list

3) Add the user "mily" to the project "accounting" with "member" role.

anusreee@anusreee-VirtualBox:~/devstack$ keystone user-role-add --user 4a64febe98c8458990dd1c30914092c8 --role 705cd9b1bd494d83848b8252d3609ddc --tenant 1233d68292f94f8e9f422c47fe7270c


ie: keystone user-role-add --user <user-id> --role <role-id> --tenant <tenant-id>

4)
After add the user "mily" to the project "accounting" with role "member" we have to go to browser and login as the user "mily"

After login:

OpenStack CLI Examples

1)
Goto devstack folder
$ cd devstack

2)
Run rejoin_stack.sh to run all services
$ ./rejion_stack.sh

 
* Press "Ctrl" + "A", then press "D" to exit from "rejion_stack.sh" window.

3)
Export OpenStack admin user credentials
$ source openrc admin

 4)
Run some keystone commands
$ keystone tenant-list

$ keystone user-list

$ keystone role-list

 
$ keystone tenant-get <id>

$ keystone user-get <id>

$ keystone role-get <id>

* To see all tenant, user and role related commands
$ keystone --help | grep tenant

$ keystone --help | grep user

$ keystone --help | grep role

* To see all keystone commands
$ keystone --help

5)
Run some nova commands
$ nova list

$ nova show <id>

 $ nova flavor-list

 $ nova flavor-show <id>

* To see all flavor related commands
$ nova --help | grep flavor

* To see all nova commands
$ nova --help

6)
Run some glance commands
$ glance image-list

 $ glance image-show <id>

* To see all glance commands
$ glance --help

7)
Run some cinder commands
$ cinder list

$ cinder show <id>

* To see all cinder commands
$ cinder --help

8)
Run some nova network commands
 $ nova net-list

$ nova net <id>

9)
Goto horizon dashboad
#http://ip-of-machine-where-openstack-is-installed

* Compare outpot of all above commands with what you are seeing in horizon dashboad.