flask与mysql写的简单监控系统示例

2024-08-27 23:59:40

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监控系统我们都知道用来监控服务器系统的一个稳定性了,下面整理了一篇flask + mysql写的简单监控系统的配置例子,希望对各位有帮助.

这里以监控内存使用率为例,写的一个简单demo性程序,具体操作根据51reboot提供的教程写如下.

一、建库建表,创建falcon数据库:

mysql> create database falcon character set utf8;

Query OK, 1 row affected (0.00 sec)

创建内存监控使用的表stat,表结构如下:

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;

二、flask web端设置

首先我们设计一个web服务,实现如下功能,完成监控页面展示,接受POST提交上来的数据 ,提供json数据GET接口,具体框架结构图如下:

flask-monitor

目录结构如下:

web

├── flask_web.py

└── templates

    └── mon.html

flask_web代码如下：

import MySQLdb as mysql

import json

from flask import Flask, request, render_template

app = Flask(__name__)

db = mysql.connect(user="361way", passwd="123456", /

        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))  //Vevb.com

if __name__ == "__main__":

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

这里使用的汇图JS为highcharts、highstock,具体模板页面内容如下:

[root@91it templates]# cat mon.html

<title>memory monitor</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.useso.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: 'memory monitor'

            },

            series: [{

                name: 'memory monitor',

                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>

注:这里的JS代码都直接使用互联网上的代码,如果主机无法连接互联网的,可以将上面的三段代取取下来,在templates 的同级目录创建static 目录,将下载下来的三个文件放到该目录,删除模板中三处引用javascript处的代码,使用当前注释的三段.

三、agent被监控端设置

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,并通过post方法请求flask_web页面,将数据上传写入数据库,这里以监控内存为例,具体监控代码如下:

#!/usr/bin/env python

#coding=utf-8

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://test.361way.com:8888", json.dumps(data), {'Content-Type': 'application/json'})

        f = urllib2.urlopen(req)

        response = f.read()

        print response

        f.close()

        time.sleep(60)