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Installing and Configuring sar
sar and iostat and part of the sysstat package. I believe it is installed by default in CentOS 5.
Install sar: yum install sysstat
Scripts are in /etc/cron.d
And also edit [/etc/sysconfig]# cat sysstat
# How long to keep log files (days), maximum is a month, default is 7 HISTORY=15
Basic use from shell: sar -A 1
sar -n DEV #gives network device stats
sar -n EDEV #gives network device errors
To read data from the log use:
sar -f /var/log/sa/sa08 (where 08 is day number to view)
(this same command can be executed from ksar remotely.)
Note: sar can also be used to monitor processes, but can't log the results by default, however I think you could pipe it to a log manually.
Some additional sites on sar
http://www.linux.com/articles/114224
http://sourceforge.net/project/showfiles.php?group_id=179805
kSar
New beta 4.0.10:
webstart : http://ksar.atomique.net/Dev/kSar.jnlp - NICE
jar : http://ksar.atomique.net/Dev/kSar-4.0.10.jar
or wget http://downloads.sourceforge.net/ksar/kSar-4.0.10.jar?modtime=1189451880&big_mirror=0
This is a pretty killer app - you can poll all the data sar has logged, view it in very pretty graphs and also export it (only the sections you want) as a .pdf file.
The development site for kSar is: http://ksar.atomique.net/
To run the Java client: java -jar kSar-4.0.10.jar
To connect to a remote host select "launch SSH command" from the data menu. Connect as: root@ipaddress:port
Once connected via ssh, select "launch ssh command" again using:
ssh command to run: sar -A -f /var/log/sysstat/sa15 (where 15 is the day number to view)
Your path maybe: sar -A -f /var/log/sa/sa15 - just see where your sar logs are stored.
