The “Clocks are Unsynchronized” error occurs when the time on the primary and secondary DNS servers are not synchronized. It can cause issues with zone transfers between the two servers. Here are the steps to resolve the issue: Check the time on both primary and secondary DNS servers using the date command. $ date If … Read more
To find the DNS authority record for a domain, you need to perform a DNS lookup for the Start of Authority (SOA) record. The SOA record provides information about the domain’s primary name server, the email address of the responsible party for the domain, and other administrative information. You can use the dig command to … Read more
If the Apache web server is not restarting or starting properly, there could be several reasons. Here are some steps to troubleshoot and fix the issue: Check the error log: The first step is to check the Apache error log file. On most Linux distributions, the error log is located in the /var/log/httpd/ directory. Look … Read more
To send package update notifications via email on a Red Hat/CentOS/Fedora system, you can use the yum-cron package, which is part of the yum-utils package. Here’s how to set up yum-cron to send email notifications: Install the yum-cron package: sudo yum install yum-cron Open the /etc/yum/yum-cron.conf file for editing: sudo vi /etc/yum/yum-cron.conf Change the following … Read more
To perform a case-insensitive find file search in Solaris, you can use the find command with the -iname option. The -iname option searches for files that match the given pattern case-insensitively. Here’s the basic syntax: find /path/to/search -iname “pattern” Here’s an example command that searches for all files in the current directory and its subdirectories … Read more
You can use the printf command in Bash to convert hexadecimal numbers to decimal. Here is an example: $ printf “%d\n” 0x2a 42 In the above example, 0x2a is a hexadecimal number, and the printf command is used to convert it to decimal format. The %d format specifier is used to specify that the output … Read more
In UNIX and Linux, you can display a large colorful text banner on the screen using the figlet and lolcat utilities. To install the figlet and lolcat utilities on your system, you can use the following commands: For Ubuntu and Debian: $ sudo apt-get install figlet lolcat For CentOS, Fedora, and RHEL: $ sudo yum … Read more
In Bash shell, it is possible to redirect output and errors of a command to /dev/null in order to discard the command’s standard output and standard error streams. This can be useful to suppress any unwanted output, such as debugging information, or to run a command in the background without displaying output. To redirect the … Read more
bindgraph is a utility for BIND (Berkeley Internet Name Domain) that generates graphs about queries sent to BIND. To install bindgraph in FreeBSD, follow these steps: Open a terminal and log in as root. Install the bindgraph package using the following command: pkg install bindgraph This command will download and install the bindgraph package from … Read more
tasksel is a command line tool in Debian and Ubuntu that allows you to install groups of packages that are commonly used together for a specific task, such as LAMP server or DNS server, in a single click. Here are the steps to install a tasks package using tasksel: Install tasksel, if it is not … Read more