The concept of Application pool was implemented in IIS to attain maximum stability and security through process isolation property within the domains hosted in the same server. Each application pools acts as an individual process and the code of every single domain will run in these pools in an isolated manner. Multiple domains could be [...]
Apache CloudStack is open source software designed to deploy and manage large networks of virtual machines, as a highly available, highly scalable Infrastructure as a Service (IaaS) cloud computing platform. CloudStack is used by a number of service providers to offer public cloud services, and by many companies to provide an on-premises (private) cloud offering, [...]
Apache performance tuning is very important in the performance of a webserver. As compared with Apache 1.3, there are a lot of additional optimizations brings in the Apache 2.x performance. Most of these settings were done as default in the apache configuration. Since the webserver performance is very much affected by the RAM, there are [...]
chkrootkit is a tool to locally check for signs of a rootkit. It is a common tool among system administrators to check for rootkits. Here, I will explain how to install chkrootkit and scan your server for rootkits. I will also explain how to write a bash script to automate the chkrootkit scan and email [...]
Ever had to stare at those maxheld, barrier, failcnt values in OpenVZ UBC Parameters in /proc/user_beancounters? Not anymore! Below script, taken from nagios plugin, will easily look through the /proc/user_beancounters file and list all UBC parameters that are under resource shortage. […]
Lynis is an auditing tool for Unix. It scans the system and available software, to detect security issues. Beside security related information it will also scan for general system information, installed packages and configuration mistakes. […]
Picture this – Your server is running fine all these days. Low load. Low bandwidth. Happy Customers. And the next day, everything goes haywire. High bandwidth being reported by NOC. Customers’ website getting hacked. You start receiving emails complaining about port scans being executed from your server. You get frustrated by all these. [...]
Very recently, I was asked by few of my colleague to performance tune a website, which its web master found too slow to handle requests. The site was already running on a dual quad core processor with 8 GB of RAM. And, the apache configuration was at its maximum to get rocking performance from the [...]
