Information Security

apache start – Backtrack – Services – HTTPD – apache start

Backtrack Linux offers a lot to people of all skill sets and I really appreciate the thought that the developers have put behind making this a operating system platform that is friendly to all. In my experience there are penetration testers or information security enthusiasts of all levels and having Backtrack as a platform to learn from is great. The apache start menu item in Backtrack simply starts the Apache web server and is explained in more detail below.

Technology Insights

List All IP Addresses Making Port 80 Connections To Linux Server

Earlier while analyzing a Linux server it was pointed out to me that the Apache logs were filling up with constant connections requesting domains that were not configured on the server. To me it looked as if a load balancer somewhere was misconfigured and sending traffic to our IP address by mistake but I needed to open a ticket with the colocation provider to have them look into the issue further since the network in this case is not something I have any control over. Below is a quick Linux command that will output a list of IP addresses making port 80 connections to your server.

Information Security

SELinux prevented ruby from reading files stored on a NFS filesytem

While working on a server farm for a client I kept running into some issues with one of the servers. The issue appeared to be a single CentOS Linux server in a cluster of ten CentOS Linux servers configured exactly the same as the other nine CentOS Linux servers was having issues writing to a network storage device. Initially I figured that the CentOS Linux server having the issues had some permission issues with the directory that was mounted to the SAN (Storage Area Network) however after minimal troubleshooting it was verified that the permissions were identical to the other servers. I started looking through other logs on the server having the issue and located some SELinux errors that were noticeably related to the issue at hand. Below I describe where the SELinux error was located, what the specific errors were, and how I was able to resolve the errors on this specific CentOS Linux server.