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
Here’s how you can install and configure MariaDB Galera as a master-to-master replication cluster on Ubuntu 16.04 LTS: Install MariaDB on each node in the cluster: sudo apt-get update sudo apt-get install software-properties-common sudo apt-key adv –recv-keys –keyserver hkp://keyserver.ubuntu.com:80 0xF1656F24C74CD1D8 sudo add-apt-repository ‘deb [arch=amd64,i386,ppc64el] http://ftp.igh.cnrs.fr/pub/mariadb/repo/10.3/ubuntu xenial main’ sudo apt-get update sudo apt-get install mariadb-server mariadb-client … Read more
To enable TLS/SSL encryption with a GlusterFS storage cluster on Linux, you need to follow these steps: Generate a private key and a certificate signing request (CSR) for the GlusterFS server. You can use the openssl command line tool for this: openssl req -new -newkey rsa:2048 -nodes -keyout server.key -out server.csr Submit the CSR to … Read more
You can extract the contents of a .deb package file without opening it on Debian or Ubuntu Linux using the dpkg-deb command line tool. The following command will extract the contents of a .deb package file named package.deb to the directory extracted_files: dpkg-deb -R package.deb extracted_files The -R option tells dpkg-deb to extract the contents … Read more