Sar

System Activity Report

Enable sar logs

Step 1: install sysstat if there is no sar

# apt-get install sysstat

Step 2: Open “/etc/default/sysstat” using your favorite file editor and change ENABLED=”false” to ENABLED=”true”

vi /etc/default/sysstat

vi /etc/default/sysstat
----
# Should sadc collect system activity informations? Valid values
# are "true" and "false". Please do not put other values, they
# will be overwritten by debconf!
ENABLED="true"
----

Step 3: change the collection interval from every 10 minutes to every 2 minutes

vim /etc/cron.d/sysstat

# The first element of the path is a directory where the debian-sa1
# script is located
PATH=/usr/lib/sysstat:/usr/sbin:/usr/sbin:/usr/bin:/sbin:/bin

# Activity reports every 10 minutes everyday
5-55/10 * * * * root command -v debian-sa1 > /dev/null && debian-sa1 1 1

# Additional run at 23:59 to rotate the statistics file
59 23 * * * root command -v debian-sa1 > /dev/null && debian-sa1 60

Step 4. Restart the service.

Check swap

sar -S

check memory log

sar -r

Check Disk

Check cpu

sar -u 2 5

To Print Overall I/O Activities.

sar -b 3 3

To Print network statistics.

sar -n keyworks like dev /ip

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