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In the action field, you can specify files, remote systems, users, or pipes. An action entry for a file must always begin with a / and specify its full path name, such as /var/log/messages. To log messages to a remote host, you simply specify the hostname preceded by an @ sign. The following example saves all kernel messages on rabbit.trek.com: kern.* @rabbit.trek.com To send messages to users, you list their login names. The following example will send critical news messages to the consoles for the users chris and aleina: news.=crit chris,aleina You can also output messages to a named pipe (FIFO). The pipe entry for the action field begins with a |. The following example pipes kernel debug messages to the named pipe |/usr/adm/debug: kern.=debug |/usr/adm/debug
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The default /etc/syslog.conf file for Red Hat systems is shown here. Messages are logged to various files in the /var/log directory.
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# Log all kernel messages to the console. #kern.* /dev/console # Log anything (except mail) info or higher. *.info;mail.none;news.none /var/log/messages # Don't log private authentication messages! *.info;authpriv.none;cron.none /var/log/messages # The authpriv file has restricted access. authpriv.* /var/log/secure # Log all the mail messages in one place. mail.* /var/log/maillog # Log cron stuff. cron.* /var/log/cron # Everybody gets emergency messages *.emerg * # Save mail and news errors of level err # and higher in a special file. uucp,news.crit /var/log/spooler # Save boot messages also to boot.log local7.* /var/log/boot.log # INN news.=crit /var/log/news/news.crit news.=err /var/log/news/news.err news.notice /var/log/news/news.notice
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Linux treats each task performed on your system as a process, and assigns a number and a name. You can examine these processes and even stop them. Red Hat provides several tools for examining processes as well as your system performance. Easy monitoring is provided by several GUI tools, like Red Hat s Procman System Monitor.
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ps Command
From the command line, you can use the ps command to list processes. With the -aux option, you can list all processes. Piping the output to a grep command with a pattern enables you to search for a particular process. A pipe funnels the output of a preceding command as input to a following command. The following command lists all X Window System processes: ps -aux | grep 'X' A number of utilities on your system provide detailed information on your processes, as well as other system information such as CPU and disk use (see Table 1-10). Although these tools were designed to be used on a shell command line, displaying output in text lines, several now have KDE and Gnome versions that provide a GUI interface for displaying results and managing processes.
vmstat, free, top, iostat, Xload, and sar
The vmstat command outputs a detailed listing indicating the performance of different system
Performance Tool vmstat top free sar iostat Procman System Monitor Description Performance of system components Listing of most CPU intensive processes Listing of free RAM memory System activity information Disk usage Red Hat system monitor for processes and usage monitoring (System Monitor on System Tools menu)
KDE Task Manager and KDE system monitor for Performance Monitor processes and usage monitoring Table 1-10. Performance Tools
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components, including CPU, memory, I/O, and swap operations. A report is issued as a line with fields for the different components. If you provide a time period as an argument, it repeats at the specified interval usually a few seconds. The top command provides a listing of the processes on your system that are the most CPU intensive, showing what processes are using most of your resources. The listing is in real time and updated every few seconds. Commands are provided for changing a process s status, such as its priority. The free command lists the amount of free RAM memory on your system, showing how much is used and how much is free, as well as what is used for buffers and swap memory. Xload is an X Window System tool showing the load, CPU, and memory. iostat displays your disk usage, and sar shows system activity information.
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Figure 1-3.
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