10.6 Monitoring IO Performance 10.7free Command 10.8ps command 10.9 View network status 10.10linux grab bag

Source: Internet
Author: User
Tags disk usage

10.6 Monitoring IO Performance

Iostat-x View disk Usage There is a very important indicator%util, the larger the value, the more the hard disk is occupied

Iotop commands need to be installed

Iotop is also a dynamic display, focusing on the IO column
10.7 Free Command
free-m/-g/-h Command usage

The difference between buffer and Cacher
Disk-to-memory (cache)-->CPU
Cpu--> memory (buffer)--disk
10.8 PS Command

PS aux | Use to view a process

To see where the process started from, you need to know the PID number, for example, the PID is 505

Type of Process stat

10.9 Viewing network status

viewing ports for listening

View only the TCP or UDP protocol

Netstat-an Dynamic state, check the TCP IP 3 handshake 4 times the process of waving

View the sum of each state
Netstat-an | awk '/^tcp/{++sta[$NF]} END {for (key in STA) print key, "\ T", Sta[key]}

Ss-an does not show the name of the process, Netstat-an is possible
View the Listen process

10.10 Linux under Grab Bag

Tcpdump is not installed by default

Tcpdump-nn-i Ens33 The first n shows the IP, the second n is the display port number, if the host name is not added n

Do not add nn

Tcpdump-nn-c 10-w 1.cap only catch 10 packets and save to 1.cap file, 1.cap is not cat's

If you want to view 1.cap to use the command
Tcpdump-r/tmp/1.cap

Tshark needs to be installed

Remember this command, check the network card capture specific information, you can clearly see what time there is what IP visited the site, access to the site of what links
Tshark-n-T a-r http.request-t fields-e "Frame.time"-E "ip.src"-E "http.host"-E "Http.request.method"-E "http.requ Est.uri "

Extended TCP three-time handshake four times wave http://www.doc88.com/p-9913773324388.html
Tshark several usages: http://www.aminglinux.com/bbs/thread-995-1-1.html

10.6 Monitoring IO Performance 10.7free Command 10.8ps command 10.9 View network status 10.10linux grab bag

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