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How did you do the Health check in Linux?
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Answer / lokesh
Top :
Top Command can provide the top processes, CPU Load, Memory
Utilization, Swap Utilization, Running/Zombie Process,
Uptime, etc..
iostat:
This command will provide the information about the disk
utilization, Read/Write rate, etc..
vmstat:
vmstat command provides the swap memory utilization report.
sar (System Activity Reporter):
sar tool can provide the report about CPU Load, iowait and
other useful info at specified intervals.
dmesg:
dmesg command displays all the server errors including
Hardware, booting, network errors
This command will retrieve the information from log files
which located in /var/log
Other Useful commands to collect some info about the
server :
runlevel – To Know the Current Run Level
netstat –a – To see the Network sessions
netstat –rn – To View the gateways configured
who / finger – To View the Users logged in detail
ps –ef – To view all the running process and its related
files
sestatus – To check SELINUX status
service iptables status – To check firewall status
ifconfig –a – To View the Network cards and IP Address
configured
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Linux Commands 
