Monitor nginx using Netdata

In this article we will see how to monitor Nginx using Netdata

Netdata is a system for distributed real-time performance and health monitoring. It is getting popular and  is one of the trending repositories inside Github.
I have already wrote another post on netdata installation and basic setup. Please checkout here.  In this article we will see how to monitor nginx using Netdata.

Netdata has a builtin plugin for Nginx, we will use it for monitoring nginx using Netdata.  This plugin used the nginx “stub status” module to collect the metrics from nginx.

First we have to check if the “stub status” module is enabled in nginx. Use the following command to list the enabled modules and flags inside nginx

Sample output screenshot is below

nginx-netdata1

 

In the screenshot , you can see that stub module enabled.  If not, you will have to recompile Nginx with stub module . Instructions are here

Configure Stub module in Nginx

Now we can configure “stub status” module in Nginx.  It is pretty simple and straightforward.

Add the following directives inside your nginx “server” block

Config parameters are self explanatory. Once done with configuration changes, restart nginx on the machine.  You can verify if the the module is working, by launching following url in browser or any shell client

Configure Netdata to Collect Nginx metrics

Netdata has builtin plugins to collect the nginx metrics, you can find the configuration files at “/etc/netdata/python.d/nginx.conf” .
By default, Netdata will poll the “stub status”   endpoint ‘http://localhost/stub_status’ for collecting metrics. You will see the following in the config file

You can replace “localhost” with your IP address if needed. Most of the cases this is not required as we have Netdata installed on all the servers to collect the system metrics

Restart netdata if any changes made in the Netdata configurations.

You should be able to see Nginx statistics inside Netdata now. Please see few screenshots below

nginx-netdata-connections

nginx-netdata-req

You can also customize the Nginx hostname inside the Netdata configuration file.

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