To change the netplan renderer from networkd to NetworkManager on Ubuntu, you can follow these steps: Open the netplan configuration file: Run the following command to open the netplan configuration file in a text editor: sudo nano /etc/netplan/50-cloud-init.yaml Change the renderer: In the configuration file, you will see the “networkd” renderer specified. Change this to … Read more
To set up Apache with Let’s Encrypt Certificates on CentOS 8/9, you can follow these steps: Install the certbot-apache package using the command: sudo dnf install certbot-apache Run the command to obtain the SSL certificate: sudo certbot –authenticator apache -installer apache Follow the prompts to enter your email address and agree to the terms of … Read more
Here are the steps to install MariaDB on CentOS 8: Update the package manager: Run the following command to update the package manager and ensure that it has the latest package information: sudo dnf update Add the MariaDB repository: To install MariaDB on CentOS 8, you will need to add the MariaDB repository to your … Read more
To install the whois command on RHEL 8 / CentOS 8, you can use the package manager dnf: sudo dnf install whois This will install the whois package, which provides the whois command-line tool for querying domain name registration information. Once installed, you can use the whois command to look up information about a domain … Read more
To install wget on CentOS 8/9 using the yum/dnf command, use the following command: sudo dnf install wget You may need to run sudo dnf update before running the above command to ensure that you have the latest package list. You can also use yum instead of dnf. sudo yum install wget After installation you … Read more
The dig command is not installed by default on CentOS 8, but it can be easily installed using the package manager. Here are the steps to install dig on CentOS 8: Update the package manager: Run the following command to update the package manager and ensure that it has the latest package information: sudo dnf … Read more
There are a few ways to run a command with a time limit (timeout) on Linux. Here are a few options: Using the timeout command: The timeout command is a coreutils utility that can be used to run a command with a specified time limit. The syntax is as follows: timeout <duration> <command> For example, … Read more
To set up a firewall using FirewallD on CentOS 8, you can follow these steps: Make sure FirewallD is installed on your system by running the command: sudo yum install firewalld Start and enable the firewall service by running the commands: sudo systemctl start firewalld sudo systemctl enable firewalld To check the status of the … Read more
To protect SSH with Fail2Ban on CentOS 8, you can follow these steps: Install Fail2Ban by running the command sudo yum install fail2ban. Create a new Fail2Ban configuration file for SSH by running the command sudo nano /etc/fail2ban/jail.d/sshd.local. In the file, add the following configuration: [sshd] enabled = true port = ssh filter = sshd … Read more
Here’s how to enable and install the EPEL (Extra Packages for Enterprise Linux) repository on CentOS 8: Download the EPEL repository package by running the following command: sudo yum install epel-release Verify that the EPEL repository has been added by running the following command: yum repolist The EPEL repository should be listed among the enabled … Read more