Alibaba Cloud Server uses OneinStack's lnmp one-click installation package to check the number of nginx concurrency

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

Resolution:
CLOSED //No connection is active or in progress
LISTEN //The server is waiting for an incoming call
SYN_RECV //A connection request has arrived, waiting for confirmation
SYN_SENT //The application has Start, open a connection
ESTABLISHED //Normal data transfer status/current number of concurrent connections
FIN_WAIT1 //The application says it has completed
FIN_WAIT2 //The other side has agreed to release
ITMED_WAIT //Waiting for all packets to die
CLOSING //Both sides At the same time, try to close
TIME_WAIT //The other side has initialized a release
LAST_ACK //Waiting for all groups to die

2, Nginx needs to open the status module when viewing it through the web interface,

OneinStack The lnmp one-click installation package is installed by default status module (that is, added when installing Nginx --with-http_stub_status_module), open /usr/local/nginx/conf/nginx.conf, you can see

location /nginx_status {
stub_status on;
access_log off;
allow 127.0.0.1 ;
              deny all;
}

By default, it cannot be accessed through the external network,

wget 127.0.0.1/ngin on the server You can see concurrency after x_status

tail nginx_status
Active connections: 343
server accepts handled requests
317994 317994 599211
Reading: 0 Writing: 7 Waiting: 336

Analysis:
Active connections //The number of active connections currently being processed by Nginx.
server accepts handled requests //A total of 8 connections were processed, 8 handshakes were successfully created, and a total of 500 requests were processed.
Reading //nginx reads the number of header information from the client.
Writing //Nginx returns the number of Header information to the client.
Waiting //When keep-alive is turned on, this value is equal to active - (reading + writing), which means that Nginx has finished processing the resident connection that is waiting for the next request command

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