Number of Linux concurrent connections view

1. View the number of concurrent requests for Webserver (Nginx Apache) and their TCP connection status:

Netstat-n | awk '/^tcp/{++s[$NF]} END {for (a in S) print A, s[a]} '

Netstat-n|grep ^tcp|awk ' {print $NF} ' |sort-nr|uniq-c

Or:
Netstat-n | awk '/^tcp/{++state[$NF]} END {for (key in) print key, "T", State[key]} '
The returned results are generally as follows:

Last_ack 5 (number of requests waiting to be processed)
SYN_RECV 30
Established 1597 (normal transfer data status)
Fin_wait1 51
Fin_wait2 504
TIME_WAIT 1057 (processing completed, number of requests waiting for timeout to expire)

Other parameters:

CLOSED: No connection is active or in progress
Listen:server waiting to enter the call
SYN_RECV: A connection request has arrived, waiting for confirmation
Syn_sent: Application has started, open a connection
Established: normal transfer of data status
FIN_WAIT1: Application says it's finished
Fin_wait2: And one side has been allowed to release
Itmed_wait: Waiting for all groups to die
CLOSING: Try to close both sides at the same time
Time_wait: And one side has initialized a release
Last_ack: Waiting for all groups to die

2. View the number of nginx execution processes
Ps-ef | grep Nginx | Wc-l
The number returned is the number of nginx execution processes, assuming that Apache executes the
Ps-ef | grep httpd | Wc-l

3. View the number of webserver process connections:
NETSTAT-ANTP | grep 80 | grep established-c

Number of Linux concurrent connections view