Log files play a critical role in Linux systems. They help administrators monitor system activity, troubleshoot issues, track application behavior, and maintain security. As systems run continuously, log files can grow very large over time. If left unmanaged, this can consume disk space and affect system performance. Logrotate is a log file management utility designed to solve this problem. It automatically rotates, archives, compresses, and removes old log files, ensuring that logs remain manageable while preserving important historical data. Log rotation can be based on file size, age, or time intervals, and it is usually handled automatically through cron jobs or systemd timers. The main purpose of log rotation is simple: to prevent log files from growing indefinitely while keeping …

Runlevel is a preset operating state on a Unix-like operating system. A run-level is a software configuration of the system that allows only a selected group of processes to exist. A system can be booted into (i.e., started up into) any of several run-levels, each of which is represented by a single-digit integer. Each run-level designates a different system configuration and allows access to a different combination of processes (i.e., instances of executing programs).

mod_evasive is a detection and network management tool, and can be easily configured to talk to IP chains, firewalls, routers, etc . Detection is performed by creating an internal dynamic hash table of IP Addresses and URLs, and denying any single IP address that matches the criteria. #cd /usr/src #wget http://www.zdziarski.com/blog/wp-content/uploads/2010/02/mod_evasive_1.10.1.tar.gz #tar xzf mod_evasive_1.10.1.tar.gz #cd mod_evasive #apxs -cia mod_evasive20.c LoadModule evasive20_module /usr/lib/httpd/modules/mod_evasive20.so

The following are the steps to install awststs in cpanel: 1. Download wastats source: http://awstats.sourceforge.net wget http://nchc.dl.sourceforge.net/project/awstats/AWStats/7.0/awstats-7.0.tar.gz 2. Extract the tzr.gz file #gtar -zxvf awstats-7.0.tar.gz 3. Change the permissions of the awredir.pl and awstats.pl files to 755 (under awstats-7.0/wwwroot/cgi-bin/) 4. Move awredir.pl and awstats.pl and the directory icons to /home/user/cgi-bin 5. Copy /home/user/tmp/awstats/awstats.domain.com.conf to /home/user/cgi-bin 6. Edit /home/user/cgi-bin/awstats.domain.com.conf and search for the “DirIcons” line, and change it to show: DirIcons=”/cgi-bin/icon” 7. Check statistics at http://www.yourdomain.com/cgi-bin/awstats.pl?config=yourdomain.com. If you require help, contact SupportPRO Server Admin

IPTABLES is a powerful firewall utility used in Linux servers to control incoming and outgoing network traffic. It stores firewall configuration rules in the file /etc/sysconfig/iptables. To open a specific port, root privileges are required because firewall rules directly affect system security. Step-by-Step: Open a Port Using IPTABLES 1. Edit the IPTABLES Configuration File Open the configuration file using a text editor: 2. Add a Rule to Allow the Port Append the following rule to allow incoming traffic on a specific TCP port: Replace [port_number] with the required port number (for example: 8088 or 8090). 3. Restart IPTABLES Service After saving the file, restart the firewall service to apply changes: 4. Verify the Open Port Confirm that the port is …

If you corrupt the SSH settings on your server and lock yourself out of ssh, then you can reset the SSH configuration settings from WHM by following the steps below: 1. Login to your WHM on a non-secure port that is: 2086 For example http://serverip:2086 2. Then browse the URL to reset the SSH configuration settings: http://serverip:2086/scripts2/doautofixer?autofix=safesshrestart After running the script, the default port 22 will open up and after logging in the server via ssh we can edit the config file of sshd and then restart sshd service to apply the changes made. /var/cpanel/safe_sshd If you require help, contact SupportPRO Server Admin