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06.03.04
Network
Your Shell Scripts with Netpipes
There's no advantage to a sysadmin programming his own utility when
he can do the same job (though perhaps less efficiently) in a quarter
of the time with a quick and dirty shell script.
Unfortunately, bash scripts can't solve all problems. Take, for example,
making socket connections to send and receive data streams. Conventional
wisdom states that you'll have to use an existing service such as
FTP, or create your own using a programming language such as Perl
or C. I don't like these solutions: I don't like the idea of having
a service that only one person uses. I don't like using full-blown
programming languages on a server just to make a couple of simple
socket connections. What I want is a command-line utility that anybody
can use to set up TCP connections without worrying about root privileges.
I want something that works with standard input and output, is easy
to use in a script, and has a permissions system to restrict who can
use it.
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The Whole Article |
The
database will be the downfall of the ID card, say experts
Whether you're happy to carry an ID card or terrified at the prospect,
no one can deny that the introduction of the cards will be a massive
challenge for the government - and the IT companies it picks to get
the deployment underway.
Speaking at a public debate on the subject, key politicians and figures
from the public and private sectors revealed their concerns on the
issue - and it's not the rationale behind the rollout that worries
them most; it's the database behind it all.
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The Whole Article
Vimming
with SQL*Plus
Using Vim in an Oracle environment? Here are some tips and tricks
to get the most out of that popular text editor (plus, some advice
for running it on Windows 2000)
The Vi tool, which is included in nearly every UNIX-like OS and runs
on nearly 20 different platforms, is the easily the world's most popular
text editor, and Vim (or Vi iMproved), its enhanced, extended clone,
is the one of the most popular text editors among Linux sysadmins.
Given the growing popularity of Linux as a deployment platform for
the Oracle Database, Vi/Vim is increasingly used in conjunction with
SQL*Plus.
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The Whole Article
Securing
Intranets with IPCop
Simply put, your small-to-medium business intranet is only as strong
as its weakest point. In-depth defense is the only adequate approach
to security. One compromised system on an intranet is all it takes
for trojans, such as key-loggers, to be planted and used to scalp
passwords and access even more systems. An in-depth defense requires
both host and network auditing and detection, in addition to basic
host and network perimeter security. Because any security can be defeated,
it is essential to be alerted when it has been. There is no greater
business liability than an intranet that has become unknowingly compromised.
IPCop is an ideal, low-budget solution for intranets that require
comprehensive network security. On the surface, IPCop is an integrated
Web interface with a formidable assortment of security tools. Inside,
IPCop is actually a scaled-down Linux distribution outfitted and optimized
to serve as a firewall. IPCop consists of several core components:
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SysAdmin
to SysAdmin: Perl's Tie::File module
Two factors outshine all others as reasons I became a systems administrator.
The first is that, well, I like computers and computing. The second
is that I'm not particularly fond of writing code. If I were, I'd
probably be a programmer. As it stands, if I can find tools that work,
I won't write code. However, inevitably, some site-specific situation
will come up for which I have no choice. In that case, I at least
want to write very little code. Perl's Tie::File has helped me do
that on more than one occasion.
I'm sure hardcore Perl hackers could leave some crazy code snippets
in the comments for this article as examples of the insanity that
Tie::File is capable of. However, in my day-to-day work, I'm dealing
with system files. Many of them are configuration files, or flat-file
databases of one form or another. Tie::File allows me to act on an
entire file line by line, instead of bit by bit. Here's an example.
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The
Scope of Network Distributed Computing
Since December 1969, when the ARPANET project created the first modern
packet-switched network—the genesis of today's Internet—the challenge
and promise of NDC has resulted in an explosion of investment, research,
and software development. Ensuing efforts encompass nearly all aspects
of computer science today.
The scope of NDC is quite impressive. No other single aspect of computer
science research and development quite compares with the myriad problem
spaces enjoined when computers communicate, swap data, and share processing
responsibilities. This chapter presents an overview of some of the
many relevant areas of NDC research and development today.
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The Whole Article
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| From
the Forum: |
| Very
bizarre hosting/networking question |
| Forgive me if this is in the wrong forum, but
I can't see any other one that this question would fit since
I don't know all that much about networking (I can hook the
wires up and configure stuff if I have instructions, but that's
it): ...
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