Knowledge Dump

Test disk performanace

hdparm -Tt /dev/sda

Install from source

Untar.

tar zxvf file.tar.gz

Move to the newly created directory.

cd file

Execute the script.

./file.sh

Install .bin

Change permission.

chmod +x file.bin

Execute the script.

./file.bin

RPM installation

Install RPM package.

rpm -iuh packages

Upgrade RPM package.

rpm -uvh package

Find USB devices

lsusb

Mount USB storage devices

The USB drive will be mount in to the folder named “mount” located in the users home directory.

mount /dev/usb mount

Assign the mount directory proper permission.

chmod 777 /mount/point

Unmount the USB device.

umount /dev/usb

Static IP configuration for Linux

The configuration is located at /etc/network/interfaces.

# The primary network interface
# allow-hotplug eth0
auto eth0
iface eth0 inet static
address 192.168.1.3
network 192.168.1.0
netmask 255.255.255.0
broadcast 192.168.1.255
gateway 192.168.1.1

Set DNS to resolve /etc/resolv.conf.

nameserver 192.168.1.1

Install default LAMP stack (Ubuntu) apt-get

apt-get install apache2 php5-mysql libapache2-mod-php5 mysql-server

Some packages are being kept back

Run

apt-get dist-upgrade

Network interface is missing after moving VMware virtual machine

The solution is to remove the persistent-net.rules.

In Debian the file has the name of :

rm /etc/udev/rules.d/z25_persistent-net.rules

On Ubuntu the file name changes to :

rm /etc/udev/rules.d/70-persistent-net.rules

Then reboot.

Basic IPTables configuration

The following allows port 22, 80 and 443.


*filter

# Allows all loopback (lo0) traffic and drop all traffic to 127/8 that doesn't use lo0
-A INPUT -i lo -j ACCEPT
-A INPUT -i ! lo -d 127.0.0.0/8 -j REJECT

# Accepts all established inbound connections
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

# Allows all outbound traffic
# You can modify this to only allow certain traffic
-A OUTPUT -j ACCEPT

# Allows HTTP and HTTPS connections from anywhere (the normal ports for websites)
-A INPUT -p tcp --dport 80 -j ACCEPT
-A INPUT -p tcp --dport 443 -j ACCEPT

# Allows SSH connections
#
# THE -dport NUMBER IS THE SAME ONE YOU SET UP IN THE SSHD_CONFIG FILE
#
-A INPUT -p tcp -m state --state NEW --dport 22 -j ACCEPT

# Allow ping
-A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT

# log iptables denied calls
-A INPUT -m limit --limit 5/min -j LOG --log-prefix "iptables denied: " --log-level 7

# Reject all other inbound - default deny unless explicitly allowed policy
-A INPUT -j REJECT
-A FORWARD -j REJECT

COMMIT

Download: iptables.txt

Books and e-Books

Recommended reading material, I have personally found useful.

  • Byte of Python

    • Byte of Python is perhaps the best book for some one who wants to learn a programming language but has no previous background in the concept of what makes a language. This is my first recommendation, the author takes an easy approach and the user will find the exercises fun. Personally I love the approach this book takes, in my opinion beginners will have a great time reading the book. The author Swaroop C H made his work free of charge in electronic form.

  • O’Reilly Learning Python 3rd Edition

    • This book takes a deeper approach to the language.

  • Dive into Python

    • What can I say, this what every serious Python lover should read and later compare with his or her current knowledge of the language

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