netdata

Introduction

Netdata is an open source tool designed to to collect real-time indicators such as:

• processor
• disk-activity
• bandwidth
• website-visit

and so on, and then display them in easily interpreted diagrams updated in real time.

The tool is designed to visualize activities as detailed as possible, allowing the user to A general idea of what is happening and what has just happened in its system or application.

I started using netdata as a more advanced alternative. self-script Monitoring CPU and RAM consumption

Review

Netdata consists of a demon that, when executed, is responsible for collecting and display information in real time.

It's a lightweight instrument, mostly written on C , Python and JavaScript which uses minimal resources: about 2% single-processor system.

It can be run in any GNU kernel. Linux monitor any system or application and is capable of Work on PCs, servers, and embedded Linux devices.

Features

Netdata is designed to be installed in the system without interrupting any of the applications running on it.

It works in accordance with the memory requirements specified the user, using only the idle cycles of the processor.

Once the application starts, it will not run disk. Input and output, except for the journal. The tool is stored on the disk at the end of its execution and It restarts at launch.

By default, it contains certain plugins that are collected. Key system metrics, but its behavior expands with Plugin API.

Netdata can work on almost any device that uses The Linux kernel, and its graphics can be embedded in web pages.

It has an interface with customizable themes and can be customized User manually using simple HTML.

There is no dependency here, as it works like its own. Web server with static web files.

Starting with v1.12, Netdata collects anonymity by default. information about the use and send it to Google Analytics, A function that can be disabled by manual settings.

Development

Netdata is currently supported by nearly 400 members. They help (at various levels) to serve thousands of people. Users and companies using this tool.

The user with the largest contribution is Costa Tsaousis, CEO and founder of Netdata With over 600,000 additions to the code.

The second most active user is Ilya Mashchenko.

The most popular addition to Netdata appears to be the addition support data collection from Vnstat, pull request Noah Troy 200 individual comments (more than any other pull request)

The most popular feature request of all time seems to be Supports the launch of several freeipmi tasks The same Netdata.

Installation

learn.netdata.cloud

get

Before installing, make sure you have curl and other utilities.

The netdata will alert you to update the system.

>> IMPORTANT <<
Please make sure your system is up to date
by running: yum update

I suggest you do it in advance.

At .rpm Linux.

If you install netdata on CentOS or RedHat:

As an option, set the following in advance:

sudo yum upadte
sudo yum install epel-release
sudo yum install zlib-devel libuuid-devel libmnl-devel gcc make git autoconf autogen automake pkgconfig
sudo yum install autoconf-archive cmake elfutils-libelf-devel json-c-devel libuv-devel lz4-devel openssl-devel
sudo yum install curl jq nodejs

Now you can use the script from the official website. I chose to only get stable. Update and shut down the telemetry.

bash <(curl -Ss https://my-netdata.io/kickstart.sh) --stable-channel --disable-telemetry

If you got a mistake.

bash: /dev/fd/63: No such file or directory

Make sure you run command without sudo. Do not do sudo

During the installation process, you will need to press ENTER a couple of times and enter a password for sudo. If you do not follow the installation, there is a chance to miss this one. Then it will end with a fae.

The installation process is quite long. virtual CentOS 7 It took me over 20 minutes with 4 GB RAM.

After successful installation, a message will appear:

In the browser, enter 127.0.0. 1:19999

Files with netdata settings appear in

/etc/netdata

sudo ls -la /etc/netdata

netdata.conf

File. netdata.conf With current settings, you can also learn through the web interface.

In the browser, enter

localhost:19999/netdata.conf

Stop netdata

service netdata stop
systemctl stop netdata
/etc/init.d/netdata stop

Launch netdata

systemctl start netdata
systemctl start netdata
/etc/init.d/netdata start

Restart the netdata

systemctl restart netdata
systemctl restart netdata
/etc/init.d/netdata restart

Access from a remote computer

Let’s say you have netdata on 192.168.56. 104 You want to monitor it from 192.168.56. 1st

Open port 19999. ? Instructions for CentOS/RedHat )

Enter the host 192.168.56.1 in the browser

http://192.168.56.104:19999

Make sure it is http and not https otherwise it may not connect. i

API requests

The documentation lies in github

Example of request for Python

Let's look at the script. sys_monitor.py

import urllib.request import json def main(): r = urllib.request.urlopen('http://10.1.102.209:19999/api/v1/data?chart=system.cpu&points=5&after=-10&options=seconds') rr = r.read() rj = json.loads(rr) print(json.dumps(rj)) if __name__ == '__main__': main()

Let's take this example.

Requests can be made to one of two resources:

1. /api/v1/data
2. /api/v1/badge.svg

I did it on /api/v1/data. EndPoint looks like

http://10.1.102.209:19999/api/v1/data + parameters

At its core, this request is simply an appeal to a database of data already collected.

Read more about all requests in the chapter request

You can start the script command

python3 sys_monitor.py

time: Received five points, as indicated in points time given in Epoch Time format

"guest nice," "guest," "steal" are empty.

softirq:

"irq" is empty.

user: shows the CPU consumed by the user

system: shows the CPU consumed by the system

"nice" is empty

iowait: shows the CPU consumed by iowait

Article author: Andrei Olegovich