Rahul Sahu Amazon Route 53 is a DNS service offered by Amazon Web Services (AWS) and acme.sh is a command-line utility for automating the process of obtaining and renewing Let’s Encrypt SSL/TLS certificates. Here’s how you can use acme.sh to obtain a wildcard certificate for a domain hosted on Route 53: First, install acme.sh on your server … Read more
In CentOS, Red Hat Enterprise Linux (RHEL), and Fedora, you can install less by using the package manager yum. Here are the steps you can follow: Start by updating the package list by running the following command: sudo yum update Next, install less by running the following command: sudo yum install less Once the installation … Read more
In Linux, you can use the “>” symbol to redirect the output of a command to a file. Here’s an example of how you can use it: ls -l > file.txt This command will run the “ls -l” command and write the output to a file named “file.txt” in the current directory. You can also … Read more
In Ubuntu 20.04, you can set or change the Fully Qualified Domain Name (FQDN) by following these steps: First, open the /etc/hosts file by running the following command: sudo nano /etc/hosts Locate the line that starts with 127.0.0.1 and change the hostname to your desired FQDN, for example: 127.0.0.1 localhost.localdomain mynewfqdn Next, you will need … Read more
Unattended-upgrades is a package that allows Ubuntu to automatically download and install security updates and other important updates without any user intervention. This can be useful for servers or other systems that are running 24/7, as it ensures that the system remains up-to-date with security patches and other important updates. Ubuntu 20.04 includes an automatic … Read more
On Linux, you can use the command line tool “date” to add days to a date and get a new date. Here’s an example of how you can add 30 days to the current date and get the new date: date –date=’30 days’ +%Y-%m-%d This command will add 30 days to the current date and … Read more
To save iptables firewall rules permanently on Linux, you can use the iptables-save and iptables-restore commands. Start by saving your current iptables rules by running the following command: sudo iptables-save > /etc/iptables/iptables.rules This command will save the current iptables rules to a file named “iptables.rules” in the “/etc/iptables” directory. To make sure that the iptables … Read more
On Linux systems using systemd, you can use the “systemctl” command to view the status of a service. The basic syntax for the command is: systemctl status [service_name] For example, to check the status of the Apache web server, you can use the command: systemctl status httpd This command will return the current status of … Read more
Awall is a firewall management tool for Alpine Linux that allows you to configure the firewall using a simple and easy to understand configuration file. Here’s how you can set up a firewall with Awall on Alpine Linux: First, install the Awall package by running the command “apk add awall” Next, create a configuration file … Read more
In Alpine Linux, you can change the hostname (computer name) by following these steps: First, open the system’s hostname configuration file, typically located at /etc/hostname, by running the following command: nano /etc/hostname Replace the current hostname with your desired hostname in the file, then save and close the file. Next, you should also update the … Read more