Rahul Sahu

To test and validate DNSSEC using the dig command line, you can use the +dnssec option to check the DNSSEC status of a domain. Here’s an example: dig +dnssec example.com This will return the DNS record for the domain example.com along with the DNSSEC-related information such as the RRSIG, DNSKEY, and DS records. To validate … Read more

Time-To-Live (TTL) is a value in DNS records that determines how long a resolver should cache the DNS record before requesting a new one. The lower the TTL value, the more frequently resolvers will query the DNS server for the record, while a higher value will reduce the number of requests. You can see the … Read more

In CentOS 8 Linux, you can add bash auto completion by installing the bash-completion package and enabling it in the .bashrc file. Here are the steps to set it up: Open a terminal window and log in as the root user or use the sudo command to run the following commands. Install the bash-completion package … Read more

In CentOS 8 Linux, you can add bash auto completion by installing the bash-completion package and enabling it in the .bashrc file. Here are the steps to set it up: Open a terminal window and log in as the root user or use the sudo command to run the following commands. Install the bash-completion package … Read more

Log in as the root user: sudo su Create a new user: useradd <username> Set the password for the new user: passwd <username> Add the new user to the sudo group: usermod -aG wheel <username> Verify that the user has been added to the sudo group: grep wheel /etc/group Log out and log in as … Read more

In LXD, you can add or mount a directory from the host system to a container using the lxc config device command. Here are the steps to add or mount a directory in a container: Open a terminal window and log in as the root user or use the sudo command to run the following … Read more

To configure Nginx to use only TLS 1.2 or 1.3, you will need to modify the Nginx configuration file. Open the Nginx configuration file located at /etc/nginx/nginx.conf in a text editor. Find the “http” block in the file and add the following line: ssl_protocols TLSv1.2 TLSv1.3; This will tell Nginx to only use TLS 1.2 … Read more

FirewallD is a dynamic firewall manager for Linux systems that provides a command-line interface and a D-Bus interface for controlling and managing firewall rules. Here are the steps to set up a firewall using FirewallD on OpenSUSE Linux: Open a terminal window and log in as the root user or use the sudo command to … Read more

In CentOS Linux, you can use the yum package manager to check and list the installed packages on your system. Here are the steps to check and list installed packages: Open a terminal window and log in as the root user or use the sudo command to run the following commands. To check if a … Read more

In CentOS 7/8/9, you can create a new user account using the useradd command, which is a command-line utility for adding new users to the system. Here are the steps to create a new user account: Open a terminal window and log in as the root user or use the sudo command to run the … Read more