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Chapter 8 Monitoring Your System 175
If you detect an unusual number of requests coming from the same source, use
Firewall service to block trac from that source.
For more information about tcpdump, see the corresponding man page.
Consider using Ruby, Perl, shell scripts, or AppleScript to automate the monitoring Â
process. For example, using tcpdump to monitor trac can be time consuming, so
automation is necessary.
Consider using Ethereal, an X11 open source packet sning tool that you can run in Â
the X11 environment on Mac OS X Server. Unlike tcpdump, this tool has a graphical
user interface and a set of powerful network analysis tools.
For more information about Ethereal, see www.ethereal.com/.
You can use other third-party tools that automatically analyze network trac and Â
alert you to problems.
Using Server Status Notication in Server Admin
Server Admin has an easy to use notication system that can keep you informed of
your server’s hard disk status, software status, and certicate status. Server Admin will
send a mail to any address (local or not) when:
There is less than a specied percentage of free space left on any system hard disk. Â
Software Update packages are available from Apple for the server. Â
A certicate has expired or will soon expire. Â
To use the email functionality, the server starts SMTP. Make sure the rewall allows
SMTP trac from the server.
To set a notication:
1 Open Server Admin.
2 Select a server, click the Settings button in the toolbar, and then click the Notications
tab.
3 Below the “Addresses to notify” eld, click the Add (+) button and add an address.
4 Repeat as needed, then click Save.
Monitoring Server Status Overviews Using Server Admin
Server Admin has several ways to see a status overview, from detailed information for
a single server to a simplied overview for many servers.
To see a status overview for one server:
Select a server in the Server list. m