To disable password authentication for SSH on Linux, follow these steps: Open the SSH configuration file: sudo nano /etc/ssh/sshd_config Find the line that says: #PasswordAuthentication yes Uncomment the line by removing the # character and change yes to no. It should look like this: PasswordAuthentication no Save the file and exit the editor. Restart the … Read more

To install Ansible on MacOS using the command line interface (CLI), you can use the Homebrew package manager. Here are the steps to install Ansible using Homebrew: Install Homebrew, if it’s not already installed on your MacOS system: /bin/bash -c “$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)” Install Ansible using Homebrew: brew install ansible Verify the installation by checking … Read more

There are several ways to determine the version of Red Hat Enterprise Linux (RHEL) you are using: Using the lsb_release command: lsb_release -a The output will include a line indicating the distribution name and version, for example: Distributor ID: RedHatEnterpriseServer Description: Red Hat Enterprise Linux Server release 7.8 (Maipo) Using the /etc/redhat-release file: cat /etc/redhat-release … Read more

To enable console access for a KVM virtual machine (VM) managed by virsh on Ubuntu Linux, you need to perform the following steps: Connect to the virtual machine using virsh: virsh -c qemu:///system console <VM_name> Log into the virtual machine as the root user. Install the getty package, if it is not already installed: apt-get … Read more

To automatically start an LXD container at boot time on a Linux system, you need to configure the container to start automatically. Here are the steps to do this: Start the container: lxc start <container_name> Set the container to start automatically: lxc config set <container_name> boot.autostart true Restart the container to apply the change: lxc … Read more

To create a new configuration file in an Ansible playbook, you can use the template module. The template module allows you to copy a file from a source on the Ansible control machine to a destination on the remote host, while replacing variables in the source file with values specified in the playbook. Here is … Read more

Here are the steps to install and configure Varnish cache on Ubuntu 16.04 LTS: Install Varnish: sudo apt-get update sudo apt-get install varnish Edit the default Varnish configuration: sudo nano /etc/default/varnish Change the DAEMON_OPTS variable to listen on port 80: DAEMON_OPTS=”-a :80 \ -T localhost:6082 \ -f /etc/varnish/default.vcl \ -S /etc/varnish/secret \ -s malloc,256m” Configure … Read more

Here is a high-level overview of the steps to add an extra hard drive and increase the size of storage on Linux LVM: Prepare the new hard drive: Connect the new hard drive to your Linux system and use fdisk to create a new partition on the drive. Create a physical volume: Use the pvcreate … Read more

In the top command on a FreeBSD Unix operating system, you can display the CPU usage per core by using the m key. To do this, run the top command in your terminal, then press m while the top display is active. This will toggle the display between the default multi-process mode and the per-CPU … Read more

The –bwlimit option in rsync allows you to limit the bandwidth used by the transfer. You can specify the bandwidth limit in kilobytes per second. For example, to limit the transfer speed to 128 kilobytes per second, use the following command: rsync –bwlimit=128 <source> <destination> where <source> and <destination> are the paths to the source … Read more