Selva's Blog - DevOps Esy

An   intrusion detection system   ( IDS ) is a device or   software application   that monitors network or system activities for malicious activities or policy violations and produces reports to a management station.  IDS come in a variety of “flavors” and approach the goal of detecting suspicious traffic in different ways. There are network based (NIDS) and host based (HIDS) intrusion detection systems. Some systems may attempt to stop an intrusion attempt but this is neither required nor expected of a monitoring system.  Intrusion detection and prevention systems (IDPS) are primarily focused on identifying possible incidents, logging information about them, and reporting attempts. In addition, organizations use IDPSes for other purposes, such as identifying problems with security policies, documenting existing threats and deterring individuals from violating security policies.  IDPSes have become a necessary addition to the security infrastru...

What is a CDN? A Content Delivery Network is a caching service that serves up your images, JS, CSS, HTML from a geographically distributed network of servers. When a user request your site, the CDN serves up the content from the closest location to cut down on load time. Let's say you have a file on your server   http://www.domain.com/Portals/0/scripts/CoolStyles.CSS a trace route can show you the steps that it takes a particular user, on their internet connection to request that file from your server. When a request for a specific file is made by a user, the server closest to that user (in terms of the minimum number of nodes between the server and the user) is dynamically determined. This optimizes the speed with which the content is delivered to that user. When on a CDN, the steps are reduced because (hopefully) they are closer to your location, AND they're serving a cached copy of your file so that the request load is not on your server.   http://Geographically Locat...

Amazon Cloudfront Dynamic Content Delivery HTTP GET and HEAD   requests are currently supported by Amazon CloudFront. Over time, we will add support for POST requests.   Our sample setup You can convert your existing blog or setup a new blog from scratch to use cloudfront. For demonstration purpose, I'm going to setup a new blog called www.contentdeliverynetworklog.com and serve the whole blog via cloudfront as follows: Blog domain name:   www.contentdeliverynetworklog.com   (CNAME to cloudfront) Blog origin domain name:   cp.contentdeliverynetworklog.com . To fetch web content from this origin web server. Static asset domain name:   s0.contentdeliverynetworklog.net   (CNAME to cloudfront). Static asset origin domain name:   origin.contentdeliverynetworklog.net . Custom origin IP address for both static/dynamic assets:   75.126.153.203 Caching ruleset for your dynamic and static assets: I am going to use a combination of Batca...