The “Unable to read consumer identity” error message in yum command when using Red Hat Network (RHN) usually indicates that yum is unable to locate the necessary information to identify the system and its entitlements. This can happen if the RHN subscription has not been properly set up or if there is a problem with … Read more
To open multiple files in vi/vim editor, you can use the following command: vim file1 file2 file3 Once you have multiple files open, you can switch between them using the following commands: :n # go to the next file :N # go to the previous file :bn # go to the next file in the … Read more
A Proxy PAC (Proxy Auto-Configuration) file is used to configure proxy settings for a web browser. If you want to use a PAC file to configure proxy settings for a specific domain, you can use the following steps: Create a PAC file: function FindProxyForURL(url, host) { if (shExpMatch(host, “*.example.com”)) { return “PROXY proxy.example.com:8080”; } return … Read more
A Proxy PAC (Proxy Auto-Configuration) file is used to configure proxy settings for a web browser. The file specifies the rules for determining which proxy server(s) to use for which URL(s). To test the syntax of a Proxy PAC file, you can use a PAC file syntax checker, such as the one provided by Firefox. … Read more
To disable AppArmor for a specific profile, such as the MySQL server, on Ubuntu Linux, you can use the following steps: Stop the service that is protected by the profile you want to disable: sudo service mysqld stop Disable the AppArmor profile for the service: sudo apparmor_parser -R /etc/apparmor.d/usr.sbin.mysqld Start the service again: sudo service … Read more
To install vnStat, a network traffic monitor, on CentOS or RHEL, you can use the following steps: Install the vnstat package: sudo yum install vnstat Start the vnstat daemon and enable it to start automatically at boot time: sudo systemctl start vnstat sudo systemctl enable vnstat Create a database for the desired network interfaces: sudo … Read more
To view vnstat graphs using a PHP web interface frontend on CentOS or RHEL, you can use the vnstat-php frontend. Here are the steps to install and configure vnstat-php: Install the vnstat package: sudo yum install vnstat Install the Apache web server and PHP: sudo yum install httpd php Start the Apache web server and … Read more
To rename a Linux RAID array from md0 to md2, you can follow these steps: Stop the RAID array: sudo mdadm –stop /dev/md0 Create a new RAID array with the desired name: sudo mdadm –create /dev/md2 –level=<RAID_level> –raid-devices=<number_of_devices> <devices> Replace <RAID_level> with the RAID level (e.g., 0, 1, 5, 6, etc.), <number_of_devices> with the number … Read more
The shutdown command is used to shut down a CentOS 6 or RHEL 6 system. Here are a few examples of how to use the shutdown command: To shut down the system immediately: sudo shutdown -h now To shut down the system after a specified delay: sudo shutdown -h +<delay> Replace <delay> with the number … Read more
In a bash shell, you can format numbers with a currency-style thousands grouping separator by using the printf command with the %’ format specifier. For example, to format a number with a comma as the thousands grouping separator, you can use the following syntax: printf “%’d\n” <number> Replace <number> with the number you want to … Read more