A Web crawler is a computer program that browses the World Wide Web in a methodical, automated manner or in an orderly fashion. Other terms for Web crawlers are ants, automatic indexers, bots, web spiders, web robots, etc. The process is termed “web crawling”, and most site engines use it as a means to provide […]
Web Scraping : A basic know-how. Read More »
dig is a command line tips for querying DNS name servers for information about host addresses, mail exchanges, name servers, and related information. Understanding the default output The most typical, simplest query is for a single host Command line tips. By default, however, dig is pretty verbose. You probably don’t need all the information in
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System Admin Tools:First of all lets learn how to find out what is chocking or gobbling up the server resource. You can get the memory usage by issuing the command “free -m” [bash] root@spark [~]# free -m total used free shared buffers cached Mem: 4051 3052 999 0 249 1294 -/+ buffers/cache: 1508 2543
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Apache comes bundled with its own security wrapper application called suEXEC. SuExec is a security mechanism for wrapping dynamic content (SSI & CGI) – content displayed based on user input and scripts executed. Normally, when a CGI or SSI program executes, it runs as the same user who is running the web server. suEXEC allows
Apache suEXEC: Configuring, Installing and Testing suEXEC Read More »
PostgreSQL is an object-relational database management system (ORDBMS) based on POSTGRES, Version 4.2, developed at the University of California at Berkeley Computer Science Department. POSTGRES pioneered many concepts that only became available in some commercial database systems much later with PostgreSQL Command. PostgreSQL is an open-source descendant of this original Berkeley code. It supports a
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To all those who needs uninterrupted webservice here is an article that describes basic settings of how Linux Fail-over Clustering can be done using linux servers . For this purpose we can use any Red-Hat distribution and another utility called Heartbeat. The heartbeat service provides the basic functions required for the HA system. In a
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Now I am going introduce you to a set of commands & System Admin Tools that may come handy FIND [bash]find -perm 777 -type d -exec chmod 755 {} \; #Command to change all the folders under present directory with 777 to 755 find -perm 755 -type f -exec chmod 644 {} \; #Command to
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