Name

• ngx_http_reqstat_module

Description

This module will help monitor running status of Tengine.

• It can provide running status information of Tengine.

• The information is divided into different zones, and each zone is independent.

• The status information is about connections, requests, response status codes, input and output flows, rt, and upstreams.

• It shows all the results by default, and can be set to show part of them by specifying zones.

• Added requests rate and clear statistics possibility.

Compilation

The module is compiled into Tengine by default. It can be disabled with '--without-http_reqstat_module' configuration parameter, or it can be compiled as a '.so' with '--with-http_reqstat_module=shared'.

Example

http {
    req_status_zone server "$host,$server_addr:$server_port" 10M;

    server {
        location /us {
            req_status_show;
        }

        req_status server;
    }
}

• when you call '/us', you will get the results like this:

        www.taobao.com,127.0.0.1:80,162,6242,1,1,1,0,0,0,0,10,1,10,1
  

  • Each line shows the status infomation of a "$host,$server_addr:$server_port".

  • Line format:

      kv,bytes_in_total,bytes_out_total,conn_total,req_total,2xx,3xx,4xx,5xx,other,rt_total,upstream_req,upstream_rt,upstream_tries
    

    • kv value of the variable defined by the directive 'req_status_zone'
    • bytes_in_total total number of bytes received from client
    • bytes_out_total total number of bytes sent to client
    • conn_total total number of accepted connections
    • req_total total number of processed requests
    • 2xx total number of 2xx requests
    • 3xx total number of 3xx requests
    • 4xx total number of 4xx requests
    • 5xx total number of 5xx requests
    • other total number of other requests
    • rt_total accumulation or rt
    • upstream_req total number of requests calling for upstream
    • upstream_rt accumulation or upstream rt
    • upstream_tries total number of times calling for upstream

• tsar can parse the result and monitor, see also https://github.com/alibaba/tsar

Directives

req_status_zone

Syntax: req_status_zone zone_name value size

Default: none

Context: main

create shared memory for this module. 'zone_name' is the name of memory block. 'value' defines the key, in which variables can be used. 'size' defines the size of shared memory.

Example:

req_status_zone server "$host,$server_addr:$server_port" 10M;

the memory is 10MB, the key is "$host,$server_addr:$server_port", and the name is "server".

• Notice, if you want to use tsar to monitor, you should not use comma in the key.

req_status

Syntax: req_status zone_name1 [zone_name2 [zone_name3]]

Default: none

Context: main、srv、loc

Enable monitoring. You can specify multiple zones to monitor.

req_status_show

Syntax: req_status_show [zone_name1 [zone_name2 [...]]]

Default: all the targets defined by 'req_status_zone'

Context: loc

Display the status information. You can specify zones to display.