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For 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:
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kern.* @rabbit.trek.com
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For users, you just list the login names of the users you want to receive the messages. The following example will send critical news messages to the consoles for the users chris and aleina:
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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 name pipe |/usr/adm/debug:
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Whenever you make changes to the syslog.conf file, you need to restart the syslogd daemon using the following command:
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/etc/rc.d/init.d/syslog restart
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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. /etc/syslog.conf
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# Log all kernel messages to the console. # Logging much else clutters up the screen. #kern.*
/dev/console
# Log anything (except mail) of level info or higher. # Don't log private authentication messages! *.info;mail.none;news.none;authpriv.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 # Everybody gets emergency messages, plus log them on another # machine. *.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
Performance Analysis Tools and Processes
Each task performed on your system is treated by Linux as a process, and is assigned a number and a name. You can examine these processes and even stop them. From the command line, you can use the ps command to list processes. With the -aux command, you can list all processes. Piping the output to a grep command with a pattern enables you to search for a particular process. 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 28-8). 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. The vmstat command outputs a detailed listing indicating the performance of different system 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 (see Figure 28-2).
Figure 28-2: The top command 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 will display your disk usage, and sar will show system activity information (see Table 28-8). Table 28-8: Performance Tools Description
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