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

You can use the find command to find all hard links in a directory on Linux. A hard link is a second reference to an existing file that has the same inode number as the original file. Here’s the command to find all hard links in the current directory and its subdirectories: find . -type … Read more

To forcefully shut down a guest virtual machine (VM) using the virsh command on Linux KVM, use the following command: virsh destroy <domain-name> where <domain-name> is the name of the guest VM. This will send an ACPI signal to the guest OS and immediately shut down the guest machine without giving it a chance to … Read more

Here’s how you can wipe a signature from a disk device on Linux using the wipefs command: Find the disk device you want to wipe the signature from by using the lsblk command: lsblk Unmount the disk device if it is currently mounted: sudo umount /dev/<device> Replace <device> with the name of the disk device. … Read more

Here’s how you can install GlusterFS with a replicated high availability storage volume on Ubuntu 16.04 LTS: Install GlusterFS: sudo apt-get update sudo apt-get install glusterfs-server Start and enable the GlusterFS service: sudo systemctl start glusterd sudo systemctl enable glusterd Create two new directories on two different servers, which will be used as the bricks … Read more

Here’s how you can enable gzip compression in Nginx server on a Linux or Unix system: Open the Nginx configuration file, typically located at /etc/nginx/nginx.conf. In the http block, add the following lines to enable gzip compression: http { … gzip on; gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript; … } The gzip_types … Read more