Linux Netstat Statistics connection number view external Ip__linux

Some statistical data on the server:


1) Statistics 80 port connection number
Netstat-nat|grep-i "|wc-l"


2) Statistics HTTPD Protocol connection number
Ps-ef|grep httpd|wc-l


3), the statistics are connected, the status is "established
Netstat-na|grep established|wc-l


4), find out which IP address is the most connected, it closed.
Netstat-na|grep Established|awk {print $5}|awk-f: {print $1}|sort|uniq-c|sort-r +0n


Netstat-na|grep Syn|awk {print $5}|awk-f: {print $1}|sort|uniq-c|sort-r +0n


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1, view the current number of concurrent access Apache:
Netstat-an | grep established | Wc-l


Compare the difference in the number of maxclients in httpd.conf.


2. See how many processes there are:
PS Aux|grep httpd|wc-l


3, you can use the following parameters to view the data
Server-status?auto


#ps-ef|grep Httpd|wc-l
1388
Count the number of httpd processes, and even a request initiates a process for use with the Apache server.
Indicates that Apache can handle 1388 concurrent requests, which can be adjusted automatically according to the load.


#netstat-nat|grep-i "|wc-l"
4341
Netstat-an will print the current network link state of the system, and Grep-i "80" is used to extract connections related to 80 ports, wc-l count the number of connections.
The final number returned is the total number of requests currently on all 80 ports.


#netstat-na|grep Established|wc-l
376
Netstat-an Prints the current network link state of the system, and grep established extracts the information that has been established for the connection. Then wc-l statistics.
The final number returned is the total number of established connections for all 80 ports currently.


netstat-nat| | grep ESTABLISHED|WC-To view detailed records of all established connections


View the number of concurrent requests for Apache and its TCP connection status:
Linux command:
Netstat-n | awk '/^tcp/{++s[$NF]} end {for (a in S) print A, s[a]} '


(This statement is from Sina Interactive Community Business Department Sina Interactive Community Division technical Director Wang Lu there, very good) returns the result example:
Last_ack 5
SYN_RECV 30
Established 1597
Fin_wait1 51
Fin_wait2 504
Time_wait 1057
of which
SYN_RECV indicates the number of requests waiting to be processed;
Established indicates normal data transfer status;
Time_wait represents the number of requests that have finished processing and waiting for the timeout to end.


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View the number of httpd processes (that is, the number of concurrent requests that Apache can handle in prefork mode):
Linux command:
Ps-ef | grep httpd | Wc-l


View the number of concurrent requests for Apache and its TCP connection status:


Linux command:
Netstat-n | awk '/^tcp/{++s[$NF]} end {for (a in S) print A, s[a]} '
Return sample results:
Last_ack 5
SYN_RECV 30
Established 1597
Fin_wait1 51
Fin_wait2 504
Time_wait 1057


Description
SYN_RECV indicates the number of requests waiting to be processed;
Established indicates normal data transfer status;
Time_wait represents the number of requests that have finished processing and waiting for the timeout to end.