{1} The command vmstat reports information about processes, memory, paging,
block IO, traps, and cpu activity.
# vmstat 3 {2} Display Memory Utilization Slabinfo# vmstat -mGet Information
About Active / Inactive Memory Pages# vmstat -a {3} Find Out The Top 10 Memory
Consuming Process# ps -auxf | sort -nr -k 4 | head -10Find Out top 10 CPU
Consuming Process# ps -auxf | sort -nr -k 3 | head -10 {4} #9: mpstat -
Multiprocessor UsageThe
mpstat command displays activities for each available processor,
processor 0 being the first one. mpstat -P ALL to display average CPU
utilization per processor:
# mpstat -P ALL {5}
To display process memory information for pid # 47394, enter:
# pmap -d 47394 {6}#14: tcpdump - Detailed Network Traffic AnalysisThe
tcpdump is simple command that dump traffic on a network. However, you
need good understanding of TCP/IP protocol to utilize this tool.
For.e.g to display traffic info about DNS, enter:
# tcpdump -i eth1 'udp port 53'
To
display all IPv4 HTTP packets to and from port 80, i.e. print only
packets that contain data, not, for example, SYN and FIN packets and
ACK-only packets, enter:
# tcpdump 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) -
((tcp[12]&0xf0)>>2)) != 0)'
To display all FTP session to 202.54.1.5, enter:
# tcpdump -i eth1 'dst 202.54.1.5 and (port 21 or 20'
To display all HTTP session to 192.168.1.5:
# tcpdump -ni eth0 'dst 192.168.1.5 and tcp and port http' {7} # cat
/proc/cpuinfo
# cat /proc/meminfo
# cat /proc/zoneinfo
# cat /proc/mounts
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[Non-text portions of this message have been removed]
