Nginx

Nginx

Nginx is a web server which can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache. The software was publicly released in 2004. A company of the same name was founded in 2011 to provide support and Nginx plus paid software.

Available solutions




Source: https://git.zabbix.com/projects/ZBX/repos/zabbix/browse/templates/app/nginx_http


Template App Nginx by HTTP

Overview

For Zabbix version: 5.0
The template to monitor Nginx by Zabbix that work without any external scripts. Most of the metrics are collected in one go, thanks to Zabbix bulk data collection.

Template App Nginx by HTTP collects metrics by polling ngx_http_stub_status_module with HTTP agent remotely:

Active connections: 291 
server accepts handled requests
16630948 16630948 31070465 
Reading: 6 Writing: 179 Waiting: 106 

Note that this solution supports https and redirects.

This template was tested on:

  • Nginx, version 1.17.2

Setup

See Zabbix template operation for basic instructions.

Setup ngx_http_stub_status_module. Test availability of http_stub_status module with nginx -V 2>&1 | grep -o with-http_stub_status_module.

Example configuration of Nginx:

location = /basic_status {
    stub_status;
    allow <IP of your Zabbix server/proxy>;
    deny all;
}

If you use another location, don't forget to change {$NGINX.STUB_STATUS.PATH} macro.

Zabbix configuration

No specific Zabbix configuration is required.

Macros used

Name Description Default
{$NGINX.DROP_RATE.MAX.WARN}

The critical rate of the dropped connections for trigger expression.

1
{$NGINX.RESPONSE_TIME.MAX.WARN}

The Nginx maximum response time in seconds for trigger expression.

10
{$NGINX.STUB_STATUS.PATH}

The path of Nginx stub_status page.

basic_status
{$NGINX.STUB_STATUS.PORT}

The port of Nginx stub_status host or container.

80
{$NGINX.STUB_STATUS.SCHEME}

The protocol http or https of Nginx stub_status host or container.

http

Template links

There are no template links in this template.

Discovery rules

Items collected

Group Name Description Type Key and additional info
Nginx Nginx: Service status

-

SIMPLE net.tcp.service[http,"{HOST.CONN}","{$NGINX.STUB_STATUS.PORT}"]

Preprocessing:

- DISCARD_UNCHANGED_HEARTBEAT: 10m

Nginx Nginx: Service response time

-

SIMPLE net.tcp.service.perf[http,"{HOST.CONN}","{$NGINX.STUB_STATUS.PORT}"]
Nginx Nginx: Requests total

The total number of client requests.

DEPENDENT nginx.requests.total

Preprocessing:

- REGEX: server accepts handled requests\s+([0-9]+) ([0-9]+) ([0-9]+) \3

Nginx Nginx: Requests per second

The total number of client requests.

DEPENDENT nginx.requests.total.rate

Preprocessing:

- REGEX: server accepts handled requests\s+([0-9]+) ([0-9]+) ([0-9]+) \3

- CHANGE_PER_SECOND

Nginx Nginx: Connections accepted per second

The total number of accepted client connections.

DEPENDENT nginx.connections.accepted.rate

Preprocessing:

- REGEX: server accepts handled requests\s+([0-9]+) ([0-9]+) ([0-9]+) \1

- CHANGE_PER_SECOND

Nginx Nginx: Connections dropped per second

The total number of dropped client connections.

DEPENDENT nginx.connections.dropped.rate

Preprocessing:

- JAVASCRIPT: var a = value.match(/server accepts handled requests\s+([0-9]+) ([0-9]+) ([0-9]+)/) if (a) { return a[1]-a[2] }

- CHANGE_PER_SECOND

Nginx Nginx: Connections handled per second

The total number of handled connections. Generally, the parameter value is the same as accepts unless some resource limits have been reached (for example, the worker_connections limit).

DEPENDENT nginx.connections.handled.rate

Preprocessing:

- REGEX: server accepts handled requests\s+([0-9]+) ([0-9]+) ([0-9]+) \2

- CHANGE_PER_SECOND

Nginx Nginx: Connections active

The current number of active client connections including Waiting connections.

DEPENDENT nginx.connections.active

Preprocessing:

- REGEX: Active connections: ([0-9]+) \1

Nginx Nginx: Connections reading

The current number of connections where nginx is reading the request header.

DEPENDENT nginx.connections.reading

Preprocessing:

- REGEX: Reading: ([0-9]+) Writing: ([0-9]+) Waiting: ([0-9]+) \1

Nginx Nginx: Connections waiting

The current number of idle client connections waiting for a request.

DEPENDENT nginx.connections.waiting

Preprocessing:

- REGEX: Reading: ([0-9]+) Writing: ([0-9]+) Waiting: ([0-9]+) \3

Nginx Nginx: Connections writing

The current number of connections where nginx is writing the response back to the client.

DEPENDENT nginx.connections.writing

Preprocessing:

- REGEX: Reading: ([0-9]+) Writing: ([0-9]+) Waiting: ([0-9]+) \2

Nginx Nginx: Version

-

DEPENDENT nginx.version

Preprocessing:

- REGEX: Server: nginx\/(.+(?<!\r)) \1

- DISCARD_UNCHANGED_HEARTBEAT: 1d

Zabbix_raw_items Nginx: Get stub status page

The following status information is provided:

Active connections - the current number of active client connections including Waiting connections.

Accepts - the total number of accepted client connections.

Handled - the total number of handled connections. Generally, the parameter value is the same as accepts unless some resource limits have been reached (for example, the worker_connections limit).

Requests - the total number of client requests.

Reading - the current number of connections where nginx is reading the request header.

Writing - the current number of connections where nginx is writing the response back to the client.

Waiting - the current number of idle client connections waiting for a request.

https://nginx.org/en/docs/http/ngx_http_stub_status_module.html

HTTP_AGENT nginx.get_stub_status

Triggers

Name Description Expression Severity Dependencies and additional info
Nginx: Service is down

-

{TEMPLATE_NAME:net.tcp.service[http,"{HOST.CONN}","{$NGINX.STUB_STATUS.PORT}"].last()}=0 AVERAGE

Manual close: YES

Nginx: Service response time is too high (over {$NGINX.RESPONSE_TIME.MAX.WARN}s for 5m)

-

{TEMPLATE_NAME:net.tcp.service.perf[http,"{HOST.CONN}","{$NGINX.STUB_STATUS.PORT}"].min(5m)}>{$NGINX.RESPONSE_TIME.MAX.WARN} WARNING

Manual close: YES

Depends on:

- Nginx: Service is down

Nginx: High connections drop rate (more than {$NGINX.DROP_RATE.MAX.WARN} for 5m)

The dropping rate connections is greater than {$NGINX.DROP_RATE.MAX.WARN} for the last 5 minutes.

{TEMPLATE_NAME:nginx.connections.dropped.rate.min(5m)} > {$NGINX.DROP_RATE.MAX.WARN} WARNING

Depends on:

- Nginx: Service is down

Nginx: Version has changed (new version: {ITEM.VALUE})

Nginx version has changed. Ack to close.

{TEMPLATE_NAME:nginx.version.diff()}=1 and {TEMPLATE_NAME:nginx.version.strlen()}>0 INFO

Manual close: YES

Nginx: Failed to fetch stub status page (or no data for 30m)

Zabbix has not received data for items for the last 30 minutes.

{TEMPLATE_NAME:nginx.get_stub_status.str("HTTP/1.1 200")}=0 or {TEMPLATE_NAME:nginx.get_stub_status.nodata(30m)}=1 WARNING

Manual close: YES

Depends on:

- Nginx: Service is down

Feedback

Please report any issues with the template at https://support.zabbix.com

You can also provide a feedback, discuss the template or ask for help with it at ZABBIX forums.

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