[AWS] Flask application deployment preparation edition that tried to build a Python environment with eb [Elastic Beanstalk]

http://docs.aws.amazon.com/ja_jp/elasticbeanstalk/latest/dg/create-deploy-python-flask.html I will work along with

Prerequisites

[AWS] I tried to build a Python environment with eb Development environment is at least in an environment where it can be done.

In short, it is OK if you can use the following 4

Python 2.7
pip
virtualenv
awsebcli

Set up a virtual environment

Work with my client (I'm a Mac)

`variable`


VIRTUAL_ENV_NAME='eb-test-Flask'

`command`


VIRTUAL_ENV_NAME='eb-test-Flask'
cd ~
virtualenv ${VIRTUAL_ENV_NAME}

`result`


New python executable in /Users/****/eb-test-Flask/bin/python
Installing setuptools, pip, wheel...done.

Running a virtual environment

`command`


source ~/${VIRTUAL_ENV_NAME}/bin/activate

OK if the environment name is attached at the beginning of the command prompt with ()

`Verification`


(eb-test-Flask)

Introducing Flask

`command`


pip install flask==0.10.1

`Verification`


pip freeze

`result`


Flask==0.10.1
itsdangerous==0.24
Jinja2==2.8
MarkupSafe==0.23
Werkzeug==0.11.9

If the above result is output, it is successful.

Create a Flask application

Next, create an application to deploy using Elastic Beanstalk. Here we will create a RESTful web service called "Hello World".

Verification The environment name must be in parentheses at the beginning of the command prompt. With this procedure (eb-test-Flask)

Creating a project directory

`Verification`

pwd

`result`


/Users/****/eb-test-Flask

`variable`


PJ_DIR_NAME='eb-flask'

`command`


mkdir ${PJ_DIR_NAME}

`Verification`


ls | grep ${PJ_DIR_NAME}

`result`


eb-flask

`command`


cd ${PJ_DIR_NAME}

`Verification`

pwd

`result`


/Users/****/eb-test-Flask/eb-flask

Create a sample application The code is excerpted from the documentation and used as is

`application.py`


from flask import Flask

# print a nice greeting.
def say_hello(username = "World"):
    return '<p>Hello %s!</p>\n' % username

# some bits of text for the page.
header_text = '''
    <html>\n<head> <title>EB Flask Test</title> </head>\n<body>'''
instructions = '''
    <p><em>Hint</em>: This is a RESTful web service! Append a username
    to the URL (for example: <code>/Thelonious</code>) to say hello to
    someone specific.</p>\n'''
home_link = '<p><a href="/">Back</a></p>\n'
footer_text = '</body>\n</html>'

# EB looks for an 'application' callable by default.
application = Flask(__name__)

# add a rule for the index page.
application.add_url_rule('/', 'index', (lambda: header_text +
    say_hello() + instructions + footer_text))

# add a rule when the page is accessed with a name appended to the site
# URL.
application.add_url_rule('/<username>', 'hello', (lambda username:
    header_text + say_hello(username) + home_link + footer_text))

# run the app.
if __name__ == "__main__":
    # Setting debug to True enables debug output. This line should be
    # removed before deploying a production app.
    application.debug = True
    application.run()

Run application.py

Make sure you are in the working directory under the virtual environment. (If you haven't done anything else from the process so far, it's okay)

`Verification`

pwd

`result`


/Users/****/eb-test-Flask/eb-flask

`command`


python application.py

`result`


 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
 * Restarting with stat
 * Debugger is active!
 * Debugger pin code: 344-661-719

Launch your browser Go to http://127.0.0.1:5000/.

`Verification`


curl http://127.0.0.1:5000/

`result`


    <html>
<head> <title>EB Flask Test</title> </head>
<body><p>Hello World!</p>

    <p><em>Hint</em>: This is a RESTful web service! Append a username
    to the URL (for example: <code>/Thelonious</code>) to say hello to
    someone specific.</p>
</body>

If you can confirm it, you can stop it.

`command`


Control + C

Set up Flask application for eb

Since the application was able to run in my environment, I will implement it in eb

Caution I will continue to work in a virtual environment

`command`


cd ~/${VIRTUAL_ENV_NAME}/${PJ_DIR_NAME}
pwd

`result`


/Users/****/eb-test-Flask/eb-flask

`command`


pip freeze > requirements.txt

`Verification`


cat requirements.txt

`result`


Flask==0.10.1
itsdangerous==0.24
Jinja2==2.8
MarkupSafe==0.23
Werkzeug==0.11.9

Elastic Beanstalk uses requirements.txt to determine which packages to install on the EC2 instance that runs your application.

So this work is necessary. And the file name must also be requirements.txt.

End of virtual environment

`command`


deactivate

It's okay if the () at the beginning of the prompt disappears

Directory configuration check

`Verification`


tree ~/${VIRTUAL_ENV_NAME}/${PJ_DIR_NAME}

`result`


/Users/****/eb-test-Flask/eb-flask/
├── application.py
└── requirements.txt

Continued

Flask application deployment that tried to build Python environment with eb