To list all failed units/services on a Linux system using systemd, you can use the systemctl command with the –failed option. The following command will list all units/services that have failed to start or have been in a failed state: systemctl –failed This command will display a list of all units that have failed to … Read more
To install KVM on a headless CentOS 8 server, you will need to perform the following steps: Ensure that your server’s CPU supports virtualization by running the following command: grep -E ‘vmx|svm’ /proc/cpuinfo This command should return output if virtualization is supported. Install the KVM and QEMU packages by running the following command: sudo dnf … Read more
To add a network bridge (br0) on a CentOS 8 system using the nmcli command, you can use the following steps: Check the available network interfaces by running the command: nmcli device Create a new bridge interface by running the command: nmcli connection add type bridge con-name br0 ifname br0 Add an IP address to … Read more
Adminer is a popular, lightweight database management tool that can be used to manage various types of databases. To install Adminer on Ubuntu 20.04 LTS, you can use the following steps: Create a new directory for Adminer in the web root directory by running the command: sudo mkdir /var/www/html/adminer Download the latest version of Adminer … Read more
To install Vim on a CentOS or RHEL 8 system using the dnf package manager, you can use the following command: sudo dnf install vim Alternatively, if you are using the yum package manager, you can use the following command: sudo yum install vim Both dnf and yum use the same package repositories, so either … Read more
When Nginx is being used as a reverse proxy, the client’s IP address is usually passed to the backend server in the X-Real-IP header. To restore the real IP address in Nginx, you can add the following configuration to your Nginx server block: set_real_ip_from proxy_ip; real_ip_header X-Real-IP; Where proxy_ip is the IP address of the … Read more
To secure Apache with mod_md and Let’s Encrypt on Ubuntu 20.04 LTS, you can use the following steps: Install the necessary dependencies by running the command: sudo apt install -y apache2 certbot python3-certbot-apache Enable the mod_md module by running the command: sudo a2enmod md Create a new directory to store the Let’s Encrypt certificates by … Read more
To install man pages on Ubuntu Linux, you can use the package manager apt. Open a terminal and enter the following command: sudo apt-get install manpages-dev This will install the man pages for the development libraries and headers on your system. If you want to install the man pages for a specific package, you can … Read more
To install Nginx on Ubuntu 20.04 LTS, you can use the following steps: Update the package list by running the command: sudo apt update Install the Nginx package by running the command: sudo apt install nginx After the installation is completed, the Nginx service should start automatically. You can check the status of the service … Read more
To backup a LXD container, you can use the “lxc publish” command. The basic syntax for this command is “lxc publish [container name] –alias [backup name]”. This will create a snapshot of the container and save it as a new image with the specified alias (or backup name). For example, to create a backup of … Read more