Postfix Mail Delivery SMTP Troubleshooting

To avoid delay in emails, specially for gmail. Just find which MX is working by issuing below commands: # dig mx gmail.com # telnet mx-IP/name 25 upon success, just see the name of first mx tried from /var/log/maillog and add an entry in /etc/hosts file. In my case, the entry […]

Highly Available WEB Servers Cluster Configuration by using rsync and heartbeat Linux based Utilities

Highly Available  WEB Servers Cluster Configuration  by using rsync and  heartbeat Linux based Utilities Written by: Muhammad Farrukh Siddique (LPIC) Operating System on both machines: CentOS-5.3 Final  Required RPMs: Heartbeat,rsync,httpd Service to be mirrored: web service (httpd) First Machine name (fqdn): node1.ha.int  Second Machine name (fqdn): node2.ha.int IP Address of […]

Snort RPM Based Installation with SnortSnarf and Snort Rule Creation Methods on Linux RHEL /CentOS / Fedora

RPM Based Installation of Snort with SnortSnarf and Snort Rule Creation Methods: written by: Muhammad Farrukh Siddique Snort is an open source Network Intrusion Detection System Snort can also act as Sniffer and Logger In this section we will discuss the more beneficial part of Snort that is Intrusion Detection […]