collectd 检测cpu使用率

环境配置

1. install epel

https://www.cyberciti.biz/faq/installing-rhel-epel-repo-on-centos-redhat-7-x/

2. Graphing your system performance in Linux with collectd

https://www.theurbanpenguin.com/graphing-your-system-performance-in-linux-with-collectd/

3. 选择前端（参考后面的列表）

CGP https://github.com/pommi/CGP  CGP提供支持nginx配置。

nginx配置在16.04上启用了php7.0-fpm

    location ~ \.php$ {
        try_files $uri =;
        # fastcgi_pass   unix:/run/php5-fpm.sock;
        fastcgi_pass   unix:/run/php/php7.-fpm.sock;
        fastcgi_index  index.php;
        fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
        include        fastcgi_params;
    }

    # Disallow access to hidden files and directories (such as .git/)
    location ~ /\. {
        deny all;
   }

Collectd-Web https://www.tecmint.com/install-collectd-and-collectd-web-to-monitor-server-resources-in-linux/

4. 这里有一个综合的安装介绍： 使用的前端是 Collection3， 推荐使用CGP

https://fishilico.github.io/generic-config/etc-server/web/collectd.html

进阶

1. 为collectd 增加一个python的plugin来监控cpu 使用率

https://blog.csdn.net/ffeiffei/article/details/50670411

2. How to Write a Collectd Plugin with Python

https://www.tuicool.com/articles/niiIFra

3. shell plugin

http://blog.kankanan.com/article/4f7f7528-collectd-8fdb884c670d52a176d163a7.html

List of front-ends

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The following is a list of front-ends to the data collected by collectd.

Name	Type	Framework	Engine	Flush
Collectd Graph Panel	Web-based	PHP	RRDtool	Yes
Collectd Graph Z	Web-based	PHP (based on CGP)	RRDtool	Yes
Collectd-web	Web-based	CGI	RRDtool	No
CollectGraph	Web-based	MoinMoin wiki	unknown	unknown
Collection 3	Web-based	CGI	RRDtool	Yes
Collection 4	Web-based	FastCGI	gRaphaël, RRDtool	No
Collectd-carbon	Web-based	Django	Graphite/Carbon	No
collectw	Web-based	FastCGI	gRaphaël	No
EcoStats	Web-based	CGI	RRDtool	No
Facette	Web-based	Go http package	HighCharts	Yes
Heymon	Web-based	Ruby on Rails	RRDtool	No
Jarmon	Web-based	jQuery, Javascript RRD, Flowplayer Tools, (Twisted)	Flot	No
kcollectd	Stand-alone	KDE	Qt	No
Observium	Web-based	PHP	RRDtool	Yes
PerfWatcher	Web-based	PHP	RRDtool	Yes
Visage	Web-based	Ruby + Sinatra, MooTools	HighCharts (SVG)	No
Vizir	Web-based	Ruby on Rails	Rickshaw/D3js	Yes
Sick Muse	Web-based	Python, jQuery, Backbone.js	Flot	unknown
RRDscout	Web-based	Python, Flask	RRDtool	unknown