【Linux性能实时监测工具-Netdata】

Linux性能实时监测工具-Netdata，它是Linux系统实时性能监测工具，以web的可视化方式展示系统及应用程序的实时运行状态（包括cpu、内存、硬盘输入/输出、网络等linux性能的数据）。Netdata的web前端响应很快，而且不需要Flash插件。 UI很整洁，保持着 Netdata 应有的特性。第一眼看上去，你能够看到很多图表，幸运的是绝大多数常用的图表数据（像 CPU，RAM，网络和硬盘）都在顶部。如果你想深入了解图形化数据，你只需要下滑滚动条，或者点击在右边菜单的项目。通过每个图表的右下方的按钮，Netdata还能控制图表的显示，重置，缩放

Netdata用可视化的手段，将被监测者最细微的细节，展现了出来。这样便可以清晰地了解linux系统和应用程序此时的状况

优美的界面：bootstrap框架下的控制界面

自定义的控制界面：你可以使用简单的HTML代码去自定义控制界面(不需要使用javascript)

极其的快速而高效：程序使用C进行编写(默认安装下，预计只有2%的单核CPU使用率和少许的内存使用率)

零配置：你只需要去安装它，接着它就会自动地监测一切数据

零依赖：它的静态网络文件和网络接口拥有自己的网络服务器

可扩展：用它自身的插件API(可以使用许多方式来制作它的插件，从bash到node.js),你可以检测任何可以衡量的数据。

可嵌入：它可以在任何Linux内核可以运行的地方运行

监测内容：下面是Netdata目前检测的内容（大多数都不需要进行配置，安装后即可开始监测）

1.CPU的使用率,中断，软中断和频率(总量和每个单核)

2.RAM，互换和内核内存的使用率（包括KSM和内核内存deduper）

3.硬盘输入/输出(每个硬盘的带宽，操作，整理，利用等)

4.IPv4网络（数据包，错误，分片）：

TCP：连接，数据包，错误，握手

UDP:数据包，错误

广播：带宽，数据包

组播：带宽，数据包

5.Netfilter/iptables Linux防火墙(连接，连接跟踪事件，错误等)

6.进程(运行，受阻，分叉，活动等)

7.NFS文件服务器，v2,v3,v4(输入/输出，缓存，预读，RPC调用)

8.网络服务质量（唯一一个可实时可视化网络状况的工具）

9.应用程序，通过对进程树进行分组（CPU,内存，硬盘读取，硬盘写入，交换，线程，管道，套接字等）

10.Apache Web服务器状态(v2.2, v2.4)

11.Nginx Web服务器状态

12.Mysql数据库（多台服务器，单个显示：带宽，查询/s, 处理者，锁，问题，临时操作，连接，二进制日志，线程，innodb引擎等）

13.ISC Bind域名服务器（多个服务器，单个显示：客户，请求，查询，更新，失败等）

14.Postfix邮件服务器的消息队列（条目，大小）

15.Squid代理服务器（客户带宽和请求，服务带宽和请求）

16.硬件传感器（温度，电压，风扇，电源，湿度等）

17.NUT UPSes（负载，充电，电池电压，温度，使用指标，输出指标）

可以监测任意数量的SNMP服务，不过你需要进行配置，还可以对此软件进行扩展，可以使用任何语言编写插件，以此来从任何来源收集数据

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