Ok, getting metrics(CPU, Memory & Network) from Windows OS is completely different from Linux. In Linux, people can easily develop scripts to get system metrics by simply reading /proc pseudo files. In fact, there are so many open source tools to do this in Linux, like tcollector which is my favourite. Now, Let’s look at this Telegraf tool and what it does. I found Telegraf tool is a really simple, elegant way to collect Windows OS metrics and lightweight too, unlike others which some are paid and crappy. This tool doesn’t provide any wizard installation to set up, but one has to run a command in Windows Powershell to install it as Windows service. It supports multiple TSDB backend storage like Graphite, OpenTSDB, etc but I have tested only with OpenTSDB. ...

1. Install Packages Check system is capable of running KVM by running kvm-ok $ apt-get install qemu-kvm qemu-system libvirt-bin bridge-utils virt-manager -y Create KVM/Qemu Hard Disk File $ qemu-img create -f raw <name>.img <Size> ## Example $ qemu-img create -f raw ubuntu14-HD.img 10G Then copy the HD file to /var/lib/libvirt/images/ Launch VM with virt-install virt-install --name spinnaker \ --ram 11096 \ --vcpus=4 \ --os-type linux \ --os-variant=ubuntutrusty \ --accelerate \ --nographics -v \ --disk path=/var/lib/libvirt/images/ubuntu14-HD.img,size=8 \ --extra-args "console=ttyS0" \ --location /opt/ubuntu14.iso --force \ --network bridge:virbr0 Explanation ...

We think that connecting to a website over HTTPS is secure, which is true(not true sometimes!), but what about DNS queries that you(browser) send? Sure if we use HTTPS, all your (POST or GET) data is encrypted end-to-end which prevents eavesdropping, MITM attack and have Confidentiality, but again what about DNS queries? I got this question back a while ago, so after a quick Internet search, I found DNSCrypt protocol which is cool because I can encrypt DNS queries. ...

A Wi-Fi deauthentication attack is a type of denial-of-service attack that targets communication between a user and a Wi-Fi wireless access point. -Wikipedia As you can see, this type of attack is pretty powerful and difficult to detect who is attacking. There are some tools(like “aircrack-ng”) for this attack(You can check the commands here). So, basically the concept is the attacker broadcasts a wifi management “Deauthentication” frame to the victim’s devices/PC to tell them to deauthenticate. It is like, “Hey client! Can you please deauthenticate”. Once deauthenticated, then the client will reconnect to AP (Access Point). These types of frames are supposed to send by valid “AP” to its clients, but the attacker can mimic these frames and broadcast in the network. ...

GNU Screen is a terminal multiplexer, a software application that can be used to multiplex several virtual consoles, allowing a user to access multiple separate login sessions inside a single terminal window, or detach and reattach sessions from a terminal. It is useful for dealing with multiple programs from a command line interface, and for separating programs from the session of the Unix shell that started the program, particularly so a remote process continues running even when the user is disconnected. more ...

👉 Update on 27-08-2022 Moving to Hugo and other updates! I was very excited to try Jekyll and Github Pages when I heard about it. When I try to install jekyll, I got below error root@veeru:/home/veeru# gem install jekyll bundler Fetching: public_suffix-3.0.1.gem (100%) ERROR: Error installing jekyll: public_suffix requires Ruby version >= 2.1. Fetching: bundler-1.16.1.gem (100%) Successfully installed bundler-1.16.1 1 gem installed Installing ri documentation for bundler-1.16.1... Installing RDoc documentation for bundler-1.16.1... I don’t even know what that means(I’m not a Ruby guy, so..). Clearly jekyll needs more than Ruby version 2.1, but in Ubuntu 14.04 if you type apt-get install ruby -y you will end up having Ruby 1.9. So let’s install Ruby 2.4 like below ...

“MAC Address Scrambling“- By the name itself we can understand, instead of using a burned-in address, the machine uses a random MAC address. The machine/device changes MAC addresses regularly to improve security. MAC address is a 48-bit hexadecimal digit which is burned in every electronic device that has the capability of “connectivity” such as mobile devices, smart TV, PC, etc. “Apple” added this feature to iPhones from iOS8 to protect users’ privacy. ...