Tuning the VM (Virtual Memory) subsystem in Linux can help improve performance in systems with memory-intensive workloads. Here are some general tips to help tune the VM subsystem: Adjust the swappiness value: The swappiness value determines how aggressively the kernel will swap out memory pages to disk. A value of 0 disables swapping, while a … Read more
To protect the packages in your Yum repositories on CentOS/Redhat, you can use GPG (GNU Privacy Guard) to sign the RPM packages and verify their signatures before installing them. Here are the steps: Install the necessary packages to support GPG signing and verification: sudo yum install gnupg2 Generate a GPG key pair that will be … Read more
To install Memcached caching system on Redhat/CentOS, you can follow these steps: Update the system’s package cache using the following command: sudo yum update Install Memcached and its dependencies by running the following command: sudo yum install memcached libmemcached Start the Memcached service and enable it to start automatically at boot time using the following … Read more
To upgrade CentOS Linux 5.3 to v5.4, you can follow these steps: Backup your important data and configuration files to ensure that you can recover them if necessary. Update the current system using the following command to install any available updates: yum update Reboot the system to ensure that any kernel updates are loaded. reboot … Read more
To add or delete an IP address remotely using a shell script on Linux using iptables, you can use the following steps: Connect to the remote server using SSH or any other remote access method. Create a shell script using a text editor such as vi or nano. Add the following code to the shell … Read more
The MTU (Maximum Transmission Unit) is the maximum size of a packet that can be transmitted over a network. In Linux, you can change the MTU size to improve network performance or to work around network issues. To change the MTU size in Linux, you can use the ifconfig or ip command. Here’s how to … Read more
In Linux, the txqueuelen parameter is used to set the transmit queue length on a network interface. The transmit queue length determines the number of packets that can be queued for transmission on the network interface at any given time. By default, the txqueuelen value is set to a relatively small value, typically around 1000 … Read more
You can use the whois command to find out who owns a domain name on Linux/UNIX. The whois command is a client for the WHOIS protocol that is used to query databases that store information about registered domain names and other resources on the internet. To use the whois command to find out who owns … Read more
The /etc/sysctl.conf file is used to configure various system parameters on Linux systems, including security-related settings. Here are some steps you can take to harden your Linux kernel by editing the /etc/sysctl.conf file: Open the /etc/sysctl.conf file with your preferred text editor. sudo nano /etc/sysctl.conf Set the following parameters to restrict access to the /proc … Read more
To convert an MP3 file to WAV format on Linux, you can use the ffmpeg command-line tool. Here are the steps to do it: Open a terminal window. Install ffmpeg if it’s not already installed on your system. On Ubuntu or Debian, you can install it with the following command: sudo apt-get install ffmpeg Navigate … Read more