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Linux System Administration
book

Linux System Administration

by Tom Adelstein, Bill Lubanovic
March 2007
Intermediate to advanced content levelIntermediate to advanced
304 pages
11h 12m
English
O'Reilly Media, Inc.
Content preview from Linux System Administration
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Chapter 2: Setting Up a Linux Multifunction Server
Usage Statistics for server1.centralsoft.org
What is the filename of the rotated webserver log?
/var/log/apache/access.log.1
Synchronizing the System Clock
Computer systems’ clocks tend to drift. Therefore, a fairly basic configuration task is
to connect your system to a Network Time Protocol (NTP) server that will keep it
within a couple of seconds of the correct time.
To synchronize your system clock with an NTP server, add the following lines to /var/
spool/cron/crontabs/root:
# update time with NTP server
0 3,9,15,21 * * * /usr/sbin/rdate 128.2.136.71 | logger -t NTP
If the file doesn’t exist, you can create it with the command:
# touch /var/spool/cron/crontabs/root
The IP address 128.2.136.71 belongs to Carnegie Mellon University’s public time
server. You can use a different time server if you wish.
Modify permissions on the crontab file by running:
# chmod 600 /var/spool/cron/crontabs/root
and restart the cron service by running:
# /etc/init.d/cron restart
Installing Perl Modules Needed by SpamAssassin
Many tools depend on the Perl programming language or offer a Perl interface to let
you customize them (although other languages are gaining adherents in the open
source and Unix worlds). SpamAssassin, a critical tool for mail administrators (and
even mail users), is one program we’ll use in this book that relies on Perl. As a sys-
tem administrator, ...
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Publisher Resources

ISBN: 9780596009526Supplemental ContentCatalog PageErrata