/linux-server-configuration

Project [6] of the Full Stack Web Developer Nanodegree Program on Udacity

Linux Server Configuration Project

About the project

A baseline installation of a Linux distribution on a virtual machine and prepare it to host web applications, to include installing updates, securing it from a number of attack vectors and installing/configuring web and database servers

  • IP Address:
  • SSH Port:
  • URL using DNS:

Steps Followed to Configure the server

If you speak Arabic, you should watch this video Discuss Linux Server Configuration Project

1. Update all packages

sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade

Enable automatic security updates

sudo apt-get install unattended-upgrades
sudo dpkg-reconfigure --priority=low unattended-upgrades

2. Change timezone to UTC and Fix language issues

sudo timedatectl set-timezone UTC
sudo update-locale LANG=en_US.utf8 LANGUAGE=en_US.utf8 LC_ALL=en_US.utf8

3. Create a new user grader and Give him sudo access

sudo adduser grader
sudo nano /etc/sudoers.d/grader

Then add the following text grader ALL=(ALL) ALL

4. Setup SSH keys for grader

  • On local machine ssh-keygen Then choose the path for storing public and private keys
  • On remote machine home as user grader
sudo su - grader
mkdir .ssh
touch .ssh/authorized_keys 
sudo chmod 700 .ssh
sudo chmod 600 .ssh/authorized_keys 
nano .ssh/authorized_keys

Then paste the contents of the public key created on the local machine

5. Change the SSH port from 22 to 2200 | Enforce key-based authentication | Disable login for root user

sudo nano /etc/ssh/sshd_config

Then change the following:

  • Find the Port line and edit it to 2200.
  • Find the PasswordAuthentication line and edit it to no.
  • Find the PermitRootLogin line and edit it to no.
  • Save the file and run sudo service ssh restart

6. Configure the Uncomplicated Firewall (UFW)

sudo ufw default deny incoming
sudo ufw default allow outgoing
sudo ufw allow 2200/tcp
sudo ufw allow www
sudo ufw allow ntp
sudo ufw allow 8000/tcp  `serve another app on the server`
sudo ufw enable

7. Extra Step Configure fail2ban to monitor unsuccessful login attempts

sudo apt-get install fail2ban sendmail
sudo cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.local
sudo nano /etc/fail2ban/jail.local

Then Update the following:

destemail = [my email address]
action = %(action_mwl)s

[ssh]

banaction = ufw-ssh
port     = 2200

Create the ufw-ssh action referenced above:

sudo nano /etc/fail2ban/action.d/ufw-ssh.conf

Add the following:

[Definition]
actionstart =
actionstop =
actioncheck =
actionban = ufw insert 1 deny from <ip> to any app OpenSSH
actionunban = ufw delete deny from <ip> to any app OpenSSH

Finally, restart fail2ban:

sudo service fail2ban restart

8. Install Apache2 and mod-wsgi for python3 and Git

sudo apt-get install apache2 libapache2-mod-wsgi-py3 git

Note: For Python2 replace libapache2-mod-wsgi-py3 with libapache2-mod-wsgi

9. Install and configure PostgreSQL

sudo apt-get install libpq-dev python3-dev
sudo apt-get install postgresql postgresql-contrib
sudo su - postgres
psql

Then

CREATE USER catalog WITH PASSWORD 'password';
CREATE DATABASE catalog WITH OWNER catalog;
\c catalog
REVOKE ALL ON SCHEMA public FROM public;
GRANT ALL ON SCHEMA public TO catalog;
\q
exit

Note: In your catalog project you should change database engine to

engine = create_engine('postgresql://catalog:password@localhost/catalog')

10. Clone the Catalog app from GitHub and Configure it

cd /var/www/
sudo mkdir catalog
sudo chown grader:grader catalog
git clone <your_repo_url> catalog
cd catalog
git checkout production # If you have a diffrent branch!
nano catalog.wsgi

Then add the following in catalog.wsgi file

#!/usr/bin/python3
import sys
sys.stdout = sys.stderr

# Add this if you'll create a virtual environment, So you need to activate it
# -------
activate_this = '/var/www/catalog/env/bin/activate_this.py'
with open(activate_this) as file_:
    exec(file_.read(), dict(__file__=activate_this))
# -------

sys.path.insert(0,"/var/www/catalog")

from app import app as application

Optional but recommended: Setup virtual environment and Install app dependencies

sudo apt-get install python3-pip
sudo -H pip3 install virtualenv
virtualenv env
source env/bin/activate
pip3 install -r requirements.txt
  • If you don't have requirements.txt file, you can use
pip3 install flask packaging oauth2client redis passlib flask-httpauth
pip3 install sqlalchemy flask-sqlalchemy psycopg2 bleach requests

Edit Authorized JavaScript origins

11. Extra Step Clone the Neighborhood map app from GitHub

cd /var/www/
sudo mkdir map
sudo chown grader:grader map
git clone https://github.com/AliMahmoud7/neighborhood-map-fsnd

Go to [<Instance_IP>:8000](<Instance_IP>:8000/) to view it

12. Configure apache server

sudo nano /etc/apache2/sites-enabled/000-default.conf

Then add the following content:

# serve catalog app
<VirtualHost *:80>
  ServerName <IP_Address or Domain>
  ServerAlias <DNS>
  ServerAdmin <Email>
  DocumentRoot /var/www/catalog
  WSGIDaemonProcess catalog user=grader group=grader
  WSGIScriptAlias / /var/www/catalog/catalog.wsgi

  <Directory /var/www/catalog>
    WSGIProcessGroup catalog
    WSGIApplicationGroup %{GLOBAL}
    Require all granted
  </Directory>

  ErrorLog ${APACHE_LOG_DIR}/error.log
  LogLevel warn
  CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

# Serve another project on the server with different port (Extra Step)
LISTEN 8000
<VirtualHost *:8000>
  ServerName <IP_Address or Domain>
  ServerAlias <DNS>
  ServerAdmin <Email>
  DocumentRoot /var/www/map

 <Directory /var/www/map/.git>
    Require all denied
  </Directory>

  ErrorLog ${APACHE_LOG_DIR}/error.log
  LogLevel warn
  CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

13. Extra Step Configure mod_wsgi to work with python 3.6

  • Building python 3.6 from source
sudo apt install build-essential
sudo apt install libssl-dev zlib1g-dev libncurses5-dev libncursesw5-dev libreadline-dev libsqlite3-dev 
sudo apt install libgdbm-dev libdb5.3-dev libbz2-dev libexpat1-dev liblzma-dev tk-dev

wget https://www.python.org/ftp/python/3.6.2/Python-3.6.2.tar.xz
tar xf Python-3.6.2.tar.xz
cd Python-3.6.2
./configure --enable-shared --enable-optimizations
make
sudo make altinstall
sudo cp libpython3.6m.so.1.0 /usr/local/lib
sudo cp libpython3.6m.so.1.0 /usr/lib
ln -fs /usr/local/bin/python3.6 /usr/bin/python3.6
sudo nano /etc/ld.so.conf.d/python36.conf

Then add the following text:

/usr/local/lib/python3.6
/usr/local/lib
  • Install the mod_wsgi 4.5.18 or latest version
wget "https://github.com/GrahamDumpleton/mod_wsgi/archive/4.5.18.tar.gz"
tar xf 4.5.18.tar.gz
cd mod_wsgi-4.5.18
./configure --with-python=/usr/local/bin/python3.6
make
sudo make install
  • Note: Make sure that your virtual environment using the same version of python used by mod_wsgi, When you create a new one with virtualenv tool use -p or --python= flag to specify the python interpreter path, In my case is /usr/local/bin/python3.6 so use virtualenv --python=/usr/local/bin/python3.6 env

14. Reload & Restart Apache Server

sudo service apache2 reload
sudo service apache2 restart

Resources