How to add network bridge with nmcli (NetworkManager) on Linux

Posted on in Categories , , , , , last updated January 28, 2018

I am using Debian Linux 9 “stretch” on the desktop. I would like to create network bridge with NetworkManager. But, I am unable to find the option to add br0. How can I create or add network bridge with nmcli for NetworkManager on Linux?
Continue reading “How to add network bridge with nmcli (NetworkManager) on Linux”

Howto patch Spectre Vulnerability CVE-2017-5753/CVE-2017-5715 on Linux

Posted on in Categories , , , , , last updated April 20, 2018

A very serious security problem has been found in the Intel/AMD/ARM CPUs. Spectre CPU Vulnerability CVE-2017-5753/CVE-2017-5715 breaks the isolation between different applications. It allows an attacker to trick error-free programs, which follow best practices, into leaking their secrets. In fact, the safety checks of said best practices actually increase the attack surface and may make applications more susceptible to Spectre. How do I protect my Linux server and laptop/desktop against such attack?

How to patch Meltdown CPU Vulnerability CVE-2017-5754 on Linux

Posted on in Categories , , , , , , last updated April 20, 2018

A very serious security problem has been found in the Intel CPUs. Meltdown CPU Vulnerability CVE-2017-5754 breaks the most fundamental isolation between user applications and the operating system. This attack allows a program to access the memory, and thus also the secrets, of other programs and the operating system. How do I protect my Linux server and laptop/desktop against such attack?

How to add ssh key to qcow2 Linux cloud images using virt-sysprep

Posted on in Categories , , , , last updated December 28, 2017

I have installed and setup KVM server on an Ubuntu Linux. I downloaded various .qcow2 cloud images. How do I setup public ssh keys for downloaded CentOS/FreeBSD/Ubuntu cloud images using virt-sysprep?
Continue reading “How to add ssh key to qcow2 Linux cloud images using virt-sysprep”