Flask blog app with MongoDB via Apache WSGI : Part 3 (Production on CentOS 7)

Continued from Flask blog app with MongoDB via Apache WSGI on Ubuntu 14.

In this page, we'll deploy our Flask blog app (memonimo.com) using Apache on CentOS 7 VPS.

Git : FlaskBlog

So far, we've worked on our local Ubuntu 14 machine.

Now, it's time to play with CentOS 7 VPS.

We need to install MongoDB since our blog is using it.

First, let's configure the package management system (yum). Create a file ,/etc/yum.repos.d/mongodb-org-2.6.repo, and put in the following configuration information for the MongoDB 2.6 repository:

[mongodb-org-2.6]
name=MongoDB 2.6 Repository
baseurl=http://downloads-distro.mongodb.org/repo/redhat/os/x86_64/
gpgcheck=0
enabled=1

Next, we need to install the MongoDB packages and associated tools.

$ sudo yum install -y mongodb-org

We can start the mongod process by issuing the following command:

$ sudo service mongod start
Starting mongod (via systemctl):                           [  OK  ]

We can verify that the mongod process has started successfully by checking the contents of the log file at /var/log/mongodb/mongod.log for a line reading:

MongoDB starting : pid=16297 port=27017 dbpath=/var/lib/mongo 64-bit host=sf
... [initandlisten] db version v2.6.12

Note that <port> is the port configured in /etc/mongod.conf, 27017 by default.

We can optionally ensure that MongoDB will start following a system reboot by issuing the following command:

$ sudo chkconfig mongod on

We can restat/stop the service:

$ sudo service mongod restart
$ sudo service mongod stop

Clone repository : FlaskBlog.

Modify config.py:

DEBUG = False 

/var/www/flask/memonimo/flaskapp.wsgi:

#!/usr/bin/python
import sys
import logging
logging.basicConfig(stream=sys.stderr)

# Dev
# sys.path.insert(0,"/var/www/FlaskApp/")
# from Blog import app as application

# Production
sys.path.insert(0,"/var/www/flask")
from memonimo import app as application

application.secret_key = 'memonimo secret key'

Modify /var/www/flask/memonimo/config.py:

...
app = Flask('memonimo')
...

Let's setup Virtualenv:

$ sudo virtualenv venv
$ source venv/bin/activate
(venv)$ sudo pip install -r requirements.txt
...
Installing collected packages: Werkzeug, MarkupSafe, Jinja2, itsdangerous, flask, markdown, flask-markdown, pymongo, gunicorn
  Running setup.py install for MarkupSafe
  Running setup.py install for itsdangerous
  Running setup.py install for flask
  Running setup.py install for markdown
  Running setup.py install for flask-markdown
  Running setup.py install for pymongo

Check with Flask server (Werkzeug):

(venv)$ sudo python __init__.py
 * Running on http://0.0.0.0:8000/ (Press CTRL+C to quit)
 * Restarting with stat
 * Debugger is active!
 * Debugger pin code: 100-555-666

Create a log directory:

$ sudo mkdir -p /var/www/memonimo.com/logs/

The following is the Apache configuration (/etc/httpd/sites-available/memonimo.com.conf):

<VirtualHost *:80>
                ServerAlias memonimo.com
                ServerName www.memonimo.com
                ServerAdmin admin@memonimo.com
                WSGIDaemonProcess memonimo user=apache group=apache threads=5 python-path=/var/www/flask/memonimo:/var/www/flask/memonimo/venv/lib/python2.7/site-packages
                WSGIScriptAlias / /var/www/flask/memonimo/flaskapp.wsgi
                <Directory /var/www/flask/memonimo/>
                        WSGIProcessGroup memonimo
                        WSGIApplicationGroup %{GLOBAL}
                        Order allow,deny
                        Allow from all
                </Directory>
                Alias /static /var/www/flask/memonimo/static
                <Directory /var/www/flask/memonimo/static/>
                        Order allow,deny
                        Allow from all
                </Directory>
                ErrorLog /var/www/memonimo.com/logs/error.log
                LogLevel warn
                CustomLog /var/www/memonimo.com/logs/access.log combined
</VirtualHost>

Let's create a symlink:

$ sudo ln -s /etc/httpd/sites-available/memonimo.com.conf /etc/httpd/sites-enabled/memonimo.com.conf
$ ls -la /etc/httpd/sites-enabled
...
lrwxrwxrwx 1 root root   44 May  5 12:00 memonimo.com.conf -> /etc/httpd/sites-available/memonimo.com.conf
...

Restart the server:

$ sudo apachectl restart

At memonimo.com on the browser:

 IOError: [Errno 13] Permission denied: '/usr/share/httpd/app.log'

This can be fixed by modifying the permission for /usr/share/httpd:

$ sudo chown -R apache:apache httpd

At the first run we get the following install page for setting up our blog:

Hit "Sumit":

At "Add New":