Linux netstat view 80-Port Connection Number Example

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]} '

Return sample results:
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.

Netstat Common parameters

-A (all) shows all options, default does not show listen related
-T (TCP) displays only TCP-related options
-U (UDP) only displays UDP-related options
-N denies displaying aliases, and can display all numbers converted to numbers.
-l list only the Listen (listening) of the service, trillion thorn?/p>

-P Displays the name of the program that establishes the associated link
-R Displays routing information, routing table
-e display extended information, such as UID, etc.
-S statistics according to each protocol
-C executes the netstat command at every other fixed time.

Hint: The status of listen and listening can only be seen with-a or-l