Nmap Examples For Network Admins

http://teknixx.com/nmap-examples-for-network-admins/

System76 Meerkat: The Perfect Mini PC for Multimedia or Desktop | Linux.com

http://www.linux.com/news/hardware/desktops/829053-system76-meerkat-the-perfect-mini-pc-for-multimedia-or-desktop

StartSSL™ Certificates & Public Key Infrastructure -

http://www.startssl.com/?app=21

configure apache2 ssl/tls with a key pair generated by startssl a free certificate provider

How can I trust CAcert's root certificate? On my system

With CACERT.ORG free tls/ssl certificate

In order to have your browser or system automatically trust all certificates signed by the CAcert Certificate Authority, you must instruct your platform or browser to trust the CAcert root certificate http://www.cacert.org/index.php?id=3.

Note that for all systems, you will need to trust both the root certificate root.crt, as well as the class 3 certificate class3.crt.

Some of this information is already covered in the BrowserClients article, so also look there to see if it has the information you need.

Trusting a new Certificate Authority is a process that varies from one platform to the next, so here are some of the ways to trust the CAcert root certificates. The instructions below will only outline how to trust one certificate, and just repeat the process to trust the second certificate.

WARNING: Always double-check the fingerprint on the downloaded certificates before trusting them. If you don't, you could be trusting a maliciously modified root certificate.

Follow the link : http://wiki.cacert.org/FAQ/ImportRootCert

The beginner's guide to Docker

Beginner's guide to Docker

Dig into Docker, the red-hot open source framework, from getting started to services you can use right now to the company's direction, in this downloadable PDF

 

How to Install KVM and Create Virtual Machines on Ubuntu

If you’re using Linux, you don’t need VirtualBox or VMware to create virtual machines. You can use KVM – the kernel-based virtual machine – to run both Windows and Linux in virtual machines.
You can use KVM directly or with other command-line tools, but the graphical Virtual Machine Manager (Virt-Manager) application will feel most familiar to people that have used other virtual machine programs.

Installing KVM

KVM only works if your CPU has hardware virtualization support – either Intel VT-x or AMD-V. To determine whether your CPU includes these features, run the following command:

egrep -c ‘(svm|vmx)’ /proc/cpuinfo

A 0 indicates that your CPU doesn’t support hardware virtualization, while a 1 or more indicates that it does. You may still have to enable hardware virtualization support in your computer’s BIOS, even if this command returns a 1 or more.

Use the following command to install KVM and supporting packages. Virt-Manager is a graphical application for managing your virtual machines — you can use the kvm command directly, but libvirt and Virt-Manager simplify the process.

sudo apt-get install qemu-kvm libvirt-bin bridge-utils virt-manager

Only the root user and users in the libvirtd group have permission to use KVM virtual machines. Run the following command to add your user account to the libvirtd group:

sudo adduser name libvirtd

After running this command, log out and log back in. Run this command after logging back in and you should see an empty list of virtual machines. This indicates that everything is working correctly.

virsh -c qemu:///system list

Creating Virtual Machines

Once you’ve got KVM installed, the easiest way to use it is with the Virtual Machine Manager application. You’ll find it in your Dash.

Click the Create New Virtual Machine button on the toolbar and the Virtual Machine Manager will walk you through selecting an installation method, configuring your virtual machine’s virtual hardware, and installing your guest operating system of choice.

The process will by familiar if you’ve ever used VirtualBox, VMware, or another virtual machine application. You can install from a disc, ISO image, or even a network location.

To assign more than 2GB of memory to a virtual machine, you’ll need a 64-bit Linux kernel. Systems running 32-bit kernels can assign a maximum of 2 GB of RAM to a virtual machine.

By default, KVM gives you NAT-like bridged networking – your virtual machine won’t appear on the network as its own device, but it will have network access through the host operating system. If you’re running server software in your virtual machine and want it accessible from other devices on the network, you’ll have to tweak the networking settings.

After selecting your installation method, Virt-Manager will boot the guest operating system in a window. Install the guest operating system as you would on a physical machine.

Managing Virtual Machines

The Virtual Machine Manager window displays a list of your installed virtual machines. Right-click virtual machines in the window to perform actions, including starting, shutting down, cloning, or migrating them.

You can view information about the virtual machine and configure its virtual hardware by clicking the i-shaped toolbar icon in the virtual machine’s window.

How can I install Sun/Oracle's proprietary Java JDK 6/7/8 or JRE?

The Script way

Other ways view the full article at http://askubuntu.com/questions/56104/how-can-i-install-sun-oracles-proprietary-java-jdk-6-7-8-or-jre

If you're on a fresh installation of Ubuntu with no previous Java installations, this script automates the process outlined above if you don't want to type all that into a console. Remember, you still need to download Java from Oracle's website -- Oracle's links are not wget friendly.
Before using this make sure that this script is in the same directory as the .tar.gz file extension that you downloaded and there are no files that start with jdk-7 in the same folder. If there are, please move them out of the folder temporarily. Remember to make the script executable (chmod +x <script's file>).

#!/bin/sh

tar -xvf jdk1.8*  #Change by the you downloaded from oracle
sudo mkdir /usr/lib/jvm
sudo mv ./jdk1.7* /usr/lib/jvm/jdk1.7.0
sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdkx.y.z/bin/java" 1
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdkx.y.z/bin/javac" 1
sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/lib/jvm/jdkx.y.z/bin/javaws" 1
sudo chmod a+x /usr/bin/java
sudo chmod a+x /usr/bin/javac
sudo chmod a+x /usr/bin/javaws

If you want to install the plugin for Firefox then add this to the end of the script:

mkdir ~/.mozilla/plugins
ln -s /usr/lib/jvm/jdk1.7.0/jre/lib/amd64/libnpjp2.so ~/.mozilla/plugins/
sudo /etc/init.d/apparmor restart