市面上有很多开源的监控系统：Cacti、nagios、zabbix。感觉都不符合我的需求，为什么不自己做一个呢

用Python两个小时徒手撸了一个简易的监控系统，给大家分享一下，希望能对大家有所启发

首先数据库建表

建立一个数据库"falcon"，建表语句如下：

CREATE TABLE `stat` (

`id` int(11) unsigned NOT NULL AUTO_INCREMENT,

`host` varchar(256) DEFAULT NULL,

`mem_free` int(11) DEFAULT NULL,

`mem_usage` int(11) DEFAULT NULL,

`mem_total` int(11) DEFAULT NULL,

`load_avg` varchar(128) DEFAULT NULL,

`time` bigint(11) DEFAULT NULL,

PRIMARY KEY (`id`),

KEY `host` (`host`(255))

) ENGINE=InnoDB AUTO_INCREMENT=0 DEFAULT CHARSET=utf8;

首先我们设计一个web服务，实现如下功能：

1.完成监控页面展示

2.接受POST提交上来的数据

3.提供json数据GET接口

目录结构如下：

web

├── flask_web.py

└── templates

└── mon.html

[/code]

flask_web.py

[code]

import MySQLdb as mysql

import json

from flask import Flask, request, render_template

app = Flask(__name__)

db = mysql.connect(user="reboot", passwd="reboot123", \

db="falcon", charset="utf8")

db.autocommit(True)

c = db.cursor()

@app.route("/", methods=["GET", "POST"])

def hello():

sql = ""

if request.method == "POST":

data = request.json

try:

sql = "INSERT INTO `stat` (`host`,`mem_free`,`mem_usage`,`mem_total`,`load_avg`,`time`) VALUES('%s', '%d', '%d', '%d', '%s', '%d')" % (data['Host'], data['MemFree'], data['MemUsage'], data['MemTotal'], data['LoadAvg'], int(data['Time']))

ret = c.execute(sql)

except mysql.IntegrityError:

pass

return "OK"

else:

return render_template("mon.html")

@app.route("/data", methods=["GET"])

def getdata():

c.execute("SELECT `time`,`mem_usage` FROM `stat`")

ones = [[i[0]*1000, i[1]] for i in c.fetchall()]

return "%s(%s);" % (request.args.get('callback'), json.dumps(ones))

if __name__ == "__main__":

app.run(host="0.0.0.0", port=8888, debug=True)

这个template页面是我抄的highstock的示例，mon.html

简单起见我们只展示mem_usage信息到页面上

jb51.netHighstock Example

${demo.css}

$(function () {

$.getJSON('/data?callback=?', function (data) {

// Create the chart

$('#container').highcharts('StockChart', {

rangeSelector: {

inputEnabled: $('#container').width() > 480,

selected: 1

},

title: {

text: 'jb51.net'

},

series: [{

name: 'jb51.net',

data: data,

type: 'spline',

tooltip: {

valueDecimals: 2

}

}]

});

});

});

web展示页面完成了，运行起来：

Python flask_web.py 监听在8888端口上

我们需要做一个agent来采集数据，并上传数据库

moniItems.py

#!/usr/bin/env python

import inspect

import time

import urllib, urllib2

import json

import socket

class mon:

def __init__(self):

self.data = {}

def getTime(self):

return str(int(time.time()) + 8 * 3600)

def getHost(self):

return socket.gethostname()

def getLoadAvg(self):

with open('/proc/loadavg') as load_open:

a = load_open.read().split()[:3]

return ','.join(a)

def getMemTotal(self):

with open('/proc/meminfo') as mem_open:

a = int(mem_open.readline().split()[1])

return a / 1024

def getMemUsage(self, noBufferCache=True):

if noBufferCache:

with open('/proc/meminfo') as mem_open:

T = int(mem_open.readline().split()[1])

F = int(mem_open.readline().split()[1])

B = int(mem_open.readline().split()[1])

C = int(mem_open.readline().split()[1])

return (T-F-B-C)/1024

else:

with open('/proc/meminfo') as mem_open:

a = int(mem_open.readline().split()[1]) - int(mem_open.readline().split()[1])

return a / 1024

def getMemFree(self, noBufferCache=True):

if noBufferCache:

with open('/proc/meminfo') as mem_open:

T = int(mem_open.readline().split()[1])

F = int(mem_open.readline().split()[1])

B = int(mem_open.readline().split()[1])

C = int(mem_open.readline().split()[1])

return (F+B+C)/1024

else:

with open('/proc/meminfo') as mem_open:

mem_open.readline()

a = int(mem_open.readline().split()[1])

return a / 1024

def runAllGet(self):

#自动获取mon类里的所有getXXX方法，用XXX作为key，getXXX()的返回值作为value，构造字典

for fun in inspect.getmembers(self, predicate=inspect.ismethod):

if fun[0][:3] == 'get':

self.data[fun[0][3:]] = fun[1]()

return self.data

if __name__ == "__main__":

while True:

m = mon()

data = m.runAllGet()

print data

req = urllib2.Request("http://jb51.net:8888", json.dumps(data), {'Content-Type': 'application/json'})

f = urllib2.urlopen(req)

response = f.read()

print response

f.close()

time.sleep(60)

nohup python moniItems.py >/dev/null 2>&1 & 运行起来

访问 http://jb51.net:8888 就可以看到我们的监控数据了：效果图如下