Every other day we see some new bot crawling our site, but most of the time they are useless for us. Some of them are just sent out for some special purpose of either spamming or some type of content theft so you have to be careful and should be able to identify such unnecessary guest who have a bad purpose.

What are are Bad Robots ?
Bots who ignore robots.txt file.
Follow links through cgi scripts
Traverse the whole web site in seconds, which affect website speed.
Revisit the web site too often, even when there is no update in site.

How to prevent them for crawling your site?
You can ban all identified bad robots from getting into your site by inserting few lines at .htaccess
You can ban such bad bots by two ways
*) by banning all accesses from a particular site
*) Banning all accesses that use a specific id to access the server.

Usually having a search engine bot on your site is good for your site as they crawl and index your website faster but you should take care that you don’t allow bad bots crawling your site.

OpenVZ uses Operating System Virtualization technology through which you can partition a single physical server into multiple small computational partitions and thus a physical server can have multiple secure isolated operating systems. Each such partition looks and feels like a real server. OpenVZ is based on Linux OS.
OpenVZ requires both the host and guest to be on Linux. OpenVZ allows to have multiple Virtual Environment (up to as many as several hundreds) on a single Hardware Node such physical server are know as Virtual Private Servers(VPS) or Virtual Environments(VE).
Each VE performs and executes exactly like a stand-alone server; VEs can be rebooted independently and have root access, users, IP addresses, memory, processes, files, applications, system libraries and configuration files.

Following are some important commands which are normally used while working on a Hardware Node.
# vzlist -a : Shows list of all the VPS’s hosted on the Node.
# vzctl start VPS_ID: To start the VPS.
# vzctl stop VPS_ID : To stop (Shut Down) the VPS
# vzctl status VPS_ID : To view the status of the […]
# vzctl stop VPS_ID –fast : to stop the VPS quickly and forcefully
# vzctl enter VPS_ID : To enter in a particular VPS

The OpenVZ project is an open source community project supported by SWsoft