Assume you have a hardware firewall. This means that to cross the FW threshold, you have to be authorized in some fashion or another. The webserver is, generally, put into the DMZ outside this firewall. You're still going to lock down the ports, chroot the webserver and do all that stuff. But, it has to be outside the firewall so that the outside world knows how to get to it.

The DB server is inside the FW. It doesn't have an outside-accessible name. The webserver, because it's physically connected to the FW, has access to the internal DNS, so it knows how to find the DB server.

Basically, it's an additional layer protecting the only thing that's important - the data. You can't just hack the DB server - you have to hack the webserver to hack the DB, and even then, you only have the access the web application has.

  • In general, if you think something isn't in Perl, try it out, because it usually is. :-)
  • "What is the sound of Perl? Is it not the sound of a wall that people have stopped banging their heads against?"

In reply to Re^3: LAMP svrs - 1 or 2 is best ? by dragonchild
in thread LAMP svrs - 1 or 2 is best ? by j_c

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.