set up postfix to send mails to google apps

After hours of search and trying several different solution, I found that it is surprisingly simle:

apt-get install postfix

nano /etc/postfix/main.cnf


change the following

mydestination = mydomain.com, localhost.mydomain.com, localhost

to

mydestination = localhost.mydomain.com, localhost

Reboot the server. Done!

Thanks Gyaan Sutra

Install python 2.5 on ubuntu 10.04

So, you're a Python developer and like to use the 2.5.x track instead of the 2.6.x or the 3.x track. Well, never fear! Despite the fact that 2.5.5 is not installed in 10.04, or available in the repositories, you can still install it into your system. The following steps will show you how.
Open your terminal and type the following commands line by line:

sudo apt-get install build-essential gcc
cd Downloads
wget http://www.python.org/ftp/python/2.5.5/Python-2.5.5.tgz
tar -xvzf Python-2.5.5.tgz
cd Python-2.5.5
./configure --prefix=/usr/local/python2.5
make
make test
sudo make install
sudo ln -s /usr/local/python2.5/bin/python /usr/bin/python2.5

There you have it! Python 2.5.5 is installed. Now if you want to run it, you can type python2.5 from the terminal.


Source: Welcome to Ubuntu

Install virtualenv and django, no-nonesense way

Install virtualenv

Installing virtualenv is easy on a Linux or Mac system, but the instructions that follow are Linux (Ubuntu, actually) specific. First you’ll need setuptools:

sudo apt-get install python-setuptools

Then we can easy_install virtualenv:

sudo easy_install virtualenv

We need to use sudo here because it has to install to a global location. Don’t worry, this is the last time we’ll need to do something as root.

Create your virtualenv

cd to wherever it is you keep your projects (for me, in ~/src), and run:

virtualenv --no-site-packages venv

In this instance I’ve chosen venv as the name for my virtual environment. The —no-site-packages command tells virtualenv not to symlink the global site packages into my local environment, just take the Python standard library. This is important, because it helps us avoid the dependency difficulties mentioned above.
At this stage you might want to add venv to your list of ignored files, as you don’t want it to be committed to source control:

echo "venv" >> .gitignore

Installing Django

Now, the trick with virtualenv is that it creates its own Python and easy_install binaries, which means you can install/run things specifically in your environment. Let’s install Django:

./venv/bin/easy_install django

And it’s done. easy. You might also want to install the MySQL bindings and IPython for ease of use:

./venv/bin/easy_install ipython python-mysql

To start a new Django project, you’ll note that a django-admin.py file will have been installed for you in the environment:

./venv/bin/django-admin.py startproject myapp

Obviously you can skip this step if you have an existing Django project.

Running Django

Now the last step, which is probably obvious by now, is to run Django’s runserver with the virtual Python binary:

cd myapp

../venv/bin/python manage.py runserver 0.0.0.0:8000

And you’re away!


Source: Bradley Wright

Disable Root SSH Login on Debian

Before we begin, you should make sure that you have a regular user account and that you can su or sudo to root from it. So  do these first:

adduser usrer1

assign a passwd to user1. and then add it to sudoers. But first need to install sudo:

apt-get install sudo

add this line inside to 


        nano /etc/sudoers

user1  ALL=(ALL) ALL

Open the file up while logged on as root.

nano /etc/ssh/sshd_config

Find this section in the file, containing the line with “PermitRootLogin” in it.

#LoginGraceTime 2m
#PermitRootLogin no
#StrictModes yes
#MaxAuthTries 6

Make the line look like this to disable logging in through ssh as root.

PermitRootLogin no

Now you’ll need to restart the sshd service:

/etc/init.d/ssh restart

Now nobody can brute force your root login, at least.

Source: How-to Geek

install the latest nginx

You can get the latest stable version of Nginx from the Nginx PPA on Launchpad:
You will need to have root privileges to perform the following commands.

sudo su -
echo "deb http://ppa.launchpad.net/nginx/stable/ubuntu lucid main" >> /etc/apt/sources.list
apt-key adv --keyserver keyserver.ubuntu.com --recv-keys C300EE8C
apt-get update 
apt-get install nginx

Source: nginx wiki

Upgrade Ubuntu server

aptitude update

and install the package update-manager-core:

aptitude install update-manager-core

Then run

do-release-upgrade

More details in howtoforge

'add-apt-repository: command not found'

add-apt-repository isn't installed by default. You have to install the python-software-properties package first.

sudo apt-get install python-software-properties

Install Postgresql 8.4 on Ubuntu 10.10

Install postgres and the python libraries:

sudo apt-get install postgresql-8.4 postgresql-client-8.4 python-psycopg2

Modify the config file to allow local connections:

sudo nano /etc/postgresql/8.4/main/pg_hba.conf

Add the line:

local     all         all     md5

Save the changes to the file and restart the server.

sudo /etc/init.d/postgresql restart

Set the password for the postgres user:

sudo passwd postgres

Change to the postgres user:

su - postgres

Create a new Database:

createdb mydb

Login to the postgres shell and point to our new database:

psql mydb

Now from the postgress shell create a user and give him access to the database:

mydb=> CREATE USER myuser WITH PASSWORD 'myPassword';
mydb=> GRANT ALL PRIVILEGES ON DATABASE mydb TO myuser;
mydb=\q

Done!

Source:  Videntity's Blog

batch rename in Linux command line

The most intuitive way is  'sed' a loop. like this


for file in *.*; do mv $file `echo $file | sed 's/foo/bar/g'` ; done;

-----

DDoS blocker script

First off, try this handy command to check connected IPs:

netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n

(D)DoS Deflate is a lightweight bash shell script designed to assist in the process of blocking a denial of service attack. With (D)DoS Deflate you can configure how long will the IP address will be blocked and how many connection considered as DDoS.

How to install it:
1. Open your terminal and login as root
2. Download (D)DoS Deflate:

wget http://www.inetbase.com/scripts/ddos/install.sh

3. Give execute permission to the script:

chmod 0700 install.sh

4. Install it:

./install.sh

To add your ip address as whitelist, edit this file:

nano /usr/local/ddos/ignore.ip.list

Configure (D)DoS Deflate:

nano /usr/local/ddos/ddos.conf

More details at (D)Dos Deflate


-------------------REMOVING IPTABLES RULES-------------------
With command line :

iptables -L INPUT -n --line-numbers

You'll get the list of all blocked IP. Look at the number on the left, then :

iptables -D INPUT ((line number here))