怎样用Python写一个简单的监控系统

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匿名用户
2016-02-20

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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

flask_web.py

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
<title>51reboot.com</title>
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Highstock Example</title>

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
<style type="text/css">
${demo.css}
</style>
<script type="text/javascript">
$(function () {
$.getJSON('/data?callback=?', function (data) {

// Create the chart
$('#container').highcharts('StockChart', {

rangeSelector: {
inputEnabled: $('#container').width() > 480,
selected: 1
},

title: {
text: '51Reboot.com'
},

series: [{
name: '51Reboot.com',
data: data,
type: 'spline',
tooltip: {
valueDecimals: 2
}
}]
});
});
});
</script>
</head>
<body>
<script src="http://cdnjs.cloudflare.com/ajax/libs/highstock/2.0.4/highstock.js"></script>
<script src="http://code.highcharts.com/modules/exporting.js"></script>

<div id="container" style="height: 400px"></div>
</body>
</html>

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://51reboot.com: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

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怎样用Python写一个简单的监控系统

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