You can create an empty file in Linux using the touch command or by using a text editor. Here’s the general process for creating an empty file in Linux: Using touch: You can create an empty file using the touch command and specify the name of the file as an argument: touch [file-name] For example, … Read more
You can create a snapshot of a KVM virtual machine (VM) or domain in Linux using the virsh command-line tool. Here’s the general process for creating a snapshot in a KVM virtual machine or domain: Connect to the KVM host: Connect to the KVM host using ssh or by using the console directly. List running … Read more
To live patch the Ubuntu Linux Kernel without rebooting the server, you can use a tool called “Kpatch”. Kpatch is a dynamic live-patching system that allows you to apply kernel patches without the need for a reboot. It works by patching individual functions in the running kernel, rather than applying a full patch to the … Read more
To patch and protect the Linux kernel Zero Day Local Privilege Escalation Vulnerability (CVE-2016-5195) from Oct 21, 2016, follow these steps: Check your kernel version: uname -r Update your system: sudo apt-get update && sudo apt-get upgrade Install the latest security patches: sudo apt-get dist-upgrade Reboot your system: sudo reboot Note: The above steps are … Read more
To check the version of Ansible installed on a Linux or Unix system, use the following command: ansible –version The output will show the version number, for example: ansible 2.9.13 config file = None configured module search path = [‘/home/user/.ansible/plugins/modules’, ‘/usr/share/ansible/plugins/modules’] ansible python module location = /usr/local/lib/python3.8/dist-packages/ansible executable location = /usr/local/bin/ansible python version = 3.8.7 … Read more
To install PHP 7 on Debian Linux 8.x/7.x (jessie/wheezy), follow these steps: Add the package repository for PHP 7: sudo apt-get install apt-transport-https lsb-release ca-certificates sudo wget -O /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg echo “deb https://packages.sury.org/php/ $(lsb_release -sc) main” | sudo tee /etc/apt/sources.list.d/php.list Update the package list: sudo apt-get update Install PHP 7 and related modules: sudo apt-get … Read more
To force mark a pfSense gateway as down, you can follow these steps: Login to the pfSense web interface. Navigate to System -> Routing. Find the gateway you want to mark as down in the Gateway column and click the associated gear icon. Click the Disable button to mark the gateway as down. Note: This … Read more
To delete a KVM virtual machine guest using the virsh command, you can use the following steps: Connect to the host machine via ssh Start the virsh shell: virsh List all running VMs: virsh list –all Note the name or ID of the VM you want to delete. Destroy the VM: virsh destroy <name or … Read more
To automatically mount a ZFS file system on boot, you will need to create a new entry in the /etc/fstab file. The entry should include the following information: The ZFS file system’s name The mount point, the directory where the file system should be mounted The filesystem type, ZFS The options, default is rw The … Read more
To run commands on an LXD container instance at provision launch time, you can use cloud-init. Cloud-init is a tool that is commonly used to customize Linux instances when they launch in a cloud environment. It can be used to run commands, install packages, write files, and perform other tasks. Here is an example of … Read more