## NetData
[NetData](http://my-netdata.io/) is a system for **distributed real-time performance and health monitoring**.
It provides **unparalleled insights, in real-time**, of everything happening on the
system it runs (including applications such as web and database servers), using
**modern interactive web dashboards**.
_netdata is **fast** and **efficient**, designed to permanently run on all systems
(**physical** & **virtual** servers, **containers**, **IoT** devices), without
disrupting their core function._
[](https://install-app.yunohost.org/?app=piwigo)
**Customization brought by the package:**
* grant MySQL statistics access via a `netdata` user
* nginx root log statistics via putting `netdata` user in the `adm` group
* Dovecot statistics via giving access to Dovecot stats stocket to `netdata` user (works only with Dovecot 2.2.16+)
**Further recommendations:**
We don't allow YunoHost packages to make sensible changes to system files. So here are further customizations you can make to allow more monitoring:
* Nginx:
* requests/connections: follow [these recommandations](https://github.com/firehol/netdata/tree/master/python.d#nginx) to enable `/stab_status` (for example by putting the `location` section in `/etc/nginx/conf.d/yunohost_admin.conf`
* weblogs: you can monitor all your nginx weblogs for errors; follow [these recommendations](https://github.com/firehol/netdata/tree/master/python.d#nginx_log)
* phpfpm: follow [these recommandations](https://github.com/firehol/netdata/tree/master/python.d#phpfpm)
## Features
- **Stunning interactive bootstrap dashboards**
mouse and touch friendly, in 2 themes: dark, light
- **Amazingly fast**
responds to all queries in less than 0.5 ms per metric,
even on low-end hardware
- **Highly efficient**
collects thousands of metrics per server per second,
with just 1% CPU utilization of a single core, a few MB of RAM and no disk I/O at all
- **Sophisticated alarming**
hundreds of alarms, **out of the box**!
supports dynamic thresholds, hysteresis, alarm templates,
multiple role-based notification methods (such as email, slack.com,
pushover.net, pushbullet.com, telegram.org, twilio.com, messagebird.com)
- **Extensible**
you can monitor anything you can get a metric for,
using its Plugin API (anything can be a netdata plugin,
BASH, python, perl, node.js, java, Go, ruby, etc)
- **Embeddable**
it can run anywhere a Linux kernel runs (even IoT)
and its charts can be embedded on your web pages too
- **Customizable**
custom dashboards can be built using simple HTML (no javascript necessary)
- **Zero configuration**
auto-detects everything, it can collect up to 5000 metrics
per server out of the box
- **Zero dependencies**
it is even its own web server, for its static web files and its web API
- **Zero maintenance**
you just run it, it does the rest
- **scales to infinity**
requiring minimal central resources
- **several operating modes**
autonomous host monitoring, headless data collector, forwarding proxy, store and forward proxy, central multi-host monitoring, in all possible configurations.
Each node may have different metrics retention policy and run with or without health monitoring.
- **time-series back-ends supported**
can archive its metrics on `graphite`, `opentsdb`, `prometheus`, json document DBs, in the same or lower detail
(lower: to prevent it from congesting these servers due to the amount of data collected)
---
## What does it monitor?
netdata collects several thousands of metrics per device.
All these metrics are collected and visualized in real-time.
> _Almost all metrics are auto-detected, without any configuration._
This is a list of what it currently monitors:
- **CPU**
usage, interrupts, softirqs, frequency, total and per core, CPU states
- **Memory**
RAM, swap and kernel memory usage, KSM (Kernel Samepage Merging), NUMA
- **Disks**
per disk: I/O, operations, backlog, utilization, space, software RAID (md)
- **Network interfaces**
per interface: bandwidth, packets, errors, drops
- **IPv4 networking**
bandwidth, packets, errors, fragments,
tcp: connections, packets, errors, handshake,
udp: packets, errors,
broadcast: bandwidth, packets,
multicast: bandwidth, packets
- **IPv6 networking**
bandwidth, packets, errors, fragments, ECT,
udp: packets, errors,
udplite: packets, errors,
broadcast: bandwidth,
multicast: bandwidth, packets,
icmp: messages, errors, echos, router, neighbor, MLDv2, group membership,
break down by type
- **Interprocess Communication - IPC**
such as semaphores and semaphores arrays
- **netfilter / iptables Linux firewall**
connections, connection tracker events, errors
- **Linux DDoS protection**
SYNPROXY metrics
- **fping** latencies
for any number of hosts, showing latency, packets and packet loss
- **Processes**
running, blocked, forks, active
- **Entropy**
random numbers pool, using in cryptography
- **NFS file servers and clients**
NFS v2, v3, v4: I/O, cache, read ahead, RPC calls
- **Network QoS**
the only tool that visualizes network `tc` classes in realtime
- **Linux Control Groups**
containers: systemd, lxc, docker
- **Applications**
by grouping the process tree and reporting CPU, memory, disk reads,
disk writes, swap, threads, pipes, sockets - per group
- **Users and User Groups resource usage**
by summarizing the process tree per user and group,
reporting: CPU, memory, disk reads, disk writes, swap, threads, pipes, sockets
- **Apache and lighttpd web servers**
`mod-status` (v2.2, v2.4) and cache log statistics, for multiple servers
- **Nginx web servers**
`stub-status`, for multiple servers
- **Tomcat**
accesses, threads, free memory, volume
- **web server log files**
extracting in real-time, web server performance metrics and applying several health checks
- **mySQL databases**
multiple servers, each showing: bandwidth, queries/s, handlers, locks, issues,
tmp operations, connections, binlog metrics, threads, innodb metrics, and more
- **Postgres databases**
multiple servers, each showing: per database statistics (connections, tuples
read - written - returned, transactions, locks), backend processes, indexes,
tables, write ahead, background writer and more
- **Redis databases**
multiple servers, each showing: operations, hit rate, memory, keys, clients, slaves
- **mongodb**
operations, clients, transactions, cursors, connections, asserts, locks, etc
- **memcached databases**
multiple servers, each showing: bandwidth, connections, items
- **elasticsearch**
search and index performance, latency, timings, cluster statistics, threads statistics, etc
- **ISC Bind name servers**
multiple servers, each showing: clients, requests, queries, updates, failures and several per view metrics
- **NSD name servers**
queries, zones, protocols, query types, transfers, etc.
- **Postfix email servers**
message queue (entries, size)
- **exim email servers**
message queue (emails queued)
- **Dovecot** POP3/IMAP servers
- **ISC dhcpd**
pools utilization, leases, etc.
- **IPFS**
bandwidth, peers
- **Squid proxy servers**
multiple servers, each showing: clients bandwidth and requests, servers bandwidth and requests
- **HAproxy**
bandwidth, sessions, backends, etc
- **varnish**
threads, sessions, hits, objects, backends, etc
- **OpenVPN**
status per tunnel
- **Hardware sensors**
`lm_sensors` and `IPMI`: temperature, voltage, fans, power, humidity
- **NUT and APC UPSes**
load, charge, battery voltage, temperature, utility metrics, output metrics
- **PHP-FPM**
multiple instances, each reporting connections, requests, performance
- **hddtemp**
disk temperatures
- **smartd**
disk S.M.A.R.T. values
- **SNMP devices**
can be monitored too (although you will need to configure these)
- **statsd**
[netdata is a fully featured statsd server](https://github.com/firehol/netdata/wiki/statsd)
And you can extend it, by writing plugins that collect data from any source, using any computer language.
## Links
* Report a bug: https://github.com/YunoHost-Apps/netdata_ynh/issues
* NetData website: http://my-netdata.io/