通过Python收集汇聚MySQL 表信息的实例详解

目录

• 一.需求
• 二.公共基础文件说明
• 1.配置文件
• 2.定义声明db连接
• 3.定义声明访问db的操作
• 三.主要代码
• 3.1 创建保存数据的脚本
• 3.2 收集的功能脚本

一.需求

统计收集各个实例上table的信息，主要是表的记录数及大小。

收集的范围是cmdb中所有的数据库实例。

二.公共基础文件说明

1.配置文件

配置文为db_servers_conf.ini，假设cmdb的DBServer为119.119.119.119，单独存放收集监控数据的DBserver为110.110.110.110. 这两个DB实例的访问用户名一样，定义在了[uid_mysql] 部分，需要去收集的各个DB实例，用到的账号密码是另一个，定义在了[collector_mysql]部分。

[uid_mysql]
dbuid = 用*户*名
dbuid_p_w_d = 相*应*密*码

[cmdb_server]
db_host = 119.119.119.119
db_port = 3306

[dbmonitor_server]
db_host = 110.110.110.110
db_port = 3306

[collector_mysql]
collector = DB*实*例*用*户*名
collector_p_w_d = DB*实*例*密*码

2.定义声明db连接

文件为get_mysql_db_connect.py

# -*- coding: utf-8 -*-

import sys
import os
import configparser
import pymysql

# 获取连接串信息
def mysql_get_db_connect(db_host, db_port):
    db_host = db_host
    db_port = db_port

    db_ps_file = os.path.join(sys.path[0], "db_servers_conf.ini")
    config = configparser.ConfigParser()
    config.read(db_ps_file, encoding="utf-8")
    db_user = config.get('uid_mysql', 'dbuid')
    db_pwd = config.get('uid_mysql', 'dbuid_p_w_d')

    conn = pymysql.connect(host=db_host, port=db_port, user=db_user, password=db_pwd,  connect_timeout=5, read_timeout=5, write_timeout=5)

    return conn

# 获取连接串信息
def mysql_get_collectdb_connect(db_host, db_port):
    db_host = db_host
    db_port = db_port

    db_ps_file = os.path.join(sys.path[0], "db_servers_conf.ini")
    config = configparser.ConfigParser()
    config.read(db_ps_file, encoding="utf-8")
    db_user = config.get('collector_mysql', 'collector')
    db_pwd = config.get('collector_mysql', 'collector_p_w_d')

    conn = pymysql.connect(host=db_host, port=db_port, user=db_user, password=db_pwd,  connect_timeout=5, read_timeout=5, write_timeout=5)

    return conn

3.定义声明访问db的操作

文件为mysql_exec_sql.py,注意需要导入上面的model。

# -*- coding: utf-8 -*-

import get_mysql_db_connect

def mysql_exec_dml_sql(db_host, db_port, exec_sql):
    conn = mysql_get_db_connect.mysql_get_db_connect(db_host, db_port)
    with conn.cursor() as cursor_db:
        cursor_db.execute(exec_sql)
        conn.commit()
        ##需要显式关闭
        cursor_db.close()
        conn.close()

def mysql_exec_select_sql(db_host, db_port, exec_sql):
    conn = mysql_get_db_connect.mysql_get_db_connect(db_host, db_port)
    with conn.cursor() as cursor_db:
        cursor_db.execute(exec_sql)
        sql_rst = cursor_db.fetchall()
        ##显式关闭conn
        cursor_db.close()
        conn.close()

    return sql_rst

def mysql_exec_select_sql_include_colnames(db_host, db_port, exec_sql):
    conn = mysql_get_db_connect.mysql_get_db_connect(db_host, db_port)
    with conn.cursor() as cursor_db:
        cursor_db.execute(exec_sql)
        sql_rst = cursor_db.fetchall()
        col_names = cursor_db.description
    return sql_rst, col_names

三.主要代码

3.1 创建保存数据的脚本

用来保存收集表信息的表：table_info

create table `table_info` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `host_ip` varchar(50) NOT NULL DEFAULT '0',
  `port` varchar(10) NOT NULL DEFAULT '3306',
  `db_name` varchar(100) NOT NULL DEFAULT ''   COMMENT '数据库名字',
  `table_name` varchar(100) NOT NULL DEFAULT '' COMMENT '表名字',
  `table_rows` bigint NOT NULL DEFAULT 0 COMMENT '表行数',
  `table_data_length` bigint,
  `table_index_length` bigint,
  `table_data_free` bigint,
  `table_auto_increment` bigint,
  `creator` varchar(50) NOT NULL DEFAULT '',
  `create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  `operator` varchar(50) NOT NULL DEFAULT '',
  `operate_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
 PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4
;

收集过程，如果访问某个实例异常时，将失败的信息保存到表 gather_error_info 中，以便跟踪分析。

create table `gather_error_info` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `app_name` varchar(150) NOT NULL DEFAULT '报错的程序',
  `host_ip` varchar(50) NOT NULL DEFAULT '0',
  `port` varchar(10) NOT NULL DEFAULT '3306',
  `db_name` varchar(60) NOT NULL DEFAULT '0' COMMENT '数据库名字',
  `error_msg` varchar(500) NOT NULL DEFAULT '报错的程序',
  `status` int(11) NOT NULL DEFAULT '2',
  `creator` varchar(50) NOT NULL DEFAULT '',
  `create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  `operator` varchar(50) NOT NULL DEFAULT '',
  `operate_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
 PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4;

3.2 收集的功能脚本

定义收集 DB_info的脚本collect_tables_info.py

# -*- coding: utf-8 -*-

import sys
import os
import datetime
import configparser
import pymysql
import mysql_get_db_connect
import mysql_exec_sql
import mysql_collect_exec_sql
import pandas as pd

def collect_tables_info():
    db_ps_file = os.path.join(sys.path[0], "db_servers_conf.ini")
    config = configparser.ConfigParser()
    config.read(db_ps_file, encoding="utf-8")

    cmdb_host = config.get('cmdb_server', 'db_host')
    cmdb_port = config.getint('cmdb_server', 'db_port')

    monitor_db_host = config.get('dbmonitor_server', 'db_host')
    monitor_db_port = config.getint('dbmonitor_server', 'db_port')

    # 获取需要遍历的DB列表
    exec_sql_1 = """
select  vm_ip_address,port,b.vm_host_name,remark
FROM cmdbdb.mysqldb_instance
 ;
    """

    exec_sql_tablesizeinfo = """
select TABLE_SCHEMA,table_name,table_rows,data_length ,index_length,data_free,auto_increment
from information_schema.tables
where TABLE_SCHEMA not in ('mysql','information_schema','performance_schema','sys')
and TABLE_TYPE ='BASE TABLE';
    """

    exec_sql_insert_tablesize = " insert into monitordb.table_info (host_ip,port,db_name,table_name,table_rows,table_data_length,table_index_length,table_data_free,table_auto_increment) \
VALUES ('%s', '%s','%s','%s', %s ,%s, %s,%s, %s) ;"

    exec_sql_error = " insert into monitordb.gather_db_error (app_name,host_ip,port,error_msg) \
VALUES ('%s', '%s','%s','%s') ;"

    sql_rst_1 = mysql_exec_sql.mysql_exec_select_sql(cmdb_host, cmdb_port, exec_sql_1)
    if len(sql_rst_1):
        for i in range(len(sql_rst_1)):
            rw_host = list(sql_rst_1[i])
            db_host_ip = rw_host[0]
            db_port_s = rw_host[1]
            ##print(type(rw_host))

            ###ValueError: port should be of type int
            db_port = int(db_port_s)
            try:
              sql_rst_tablesize = mysql_collect_exec_sql.mysql_exec_select_sql(db_host_ip, db_port, exec_sql_tablesizeinfo)
              ##print(sql_rst_tablesize)
              if len(sql_rst_tablesize):
                  for i in range(len(sql_rst_tablesize)):
                      rw_tableinfo = list(sql_rst_tablesize[i])
                      rw_db_name = rw_tableinfo[0]
                      rw_table_name = rw_tableinfo[1]
                      rw_table_rows = rw_tableinfo[2]
                      rw_data_length = rw_tableinfo[3]
                      rw_index_length = rw_tableinfo[4]
                      rw_data_free = rw_tableinfo[5]
                      rw_auto_increment = rw_tableinfo[6]

                      ##print(rw_auto_increment)
                      ##Python中对变量是否为None的判断
                      if rw_auto_increment is None:
                         rw_auto_increment = 0
                      ###一定要有一个exec_sql_insert_table_com，如果是exec_sql_insert_tablesize = exec_sql_insert_tablesize  %  ( db_host_ip.......
                      ####则提示报错:报错信息是 TypeError: not all arguments converted during string formatting
                      exec_sql_insert_table_com = exec_sql_insert_tablesize  %  ( db_host_ip , db_port_s, rw_db_name, rw_table_name , rw_table_rows , rw_data_length , rw_index_length , rw_data_free , rw_auto_increment)
                      print(exec_sql_insert_table_com)
                      sql_insert_rst_1 = mysql_exec_sql.mysql_exec_dml_sql(monitor_db_host, monitor_db_port, exec_sql_insert_table_com)
                      #print(sql_insert_rst_1)
            except:
              ####print('TypeError的错误信息如下:' + str(TypeError))
              print(db_host_ip +'  '+str(db_port) + '登入异常无法获取table信息,请检查实例和访问账号!')
              exec_sql_error_sql = exec_sql_error  %  ( 'collect_tables_info',db_host_ip , str(db_port),'登入异常，获取table信息失败,请检查实例和访问的账号!!!' )
              sql_insert_err_rst_1 = mysql_exec_sql.mysql_exec_dml_sql(monitor_db_host, monitor_db_port, exec_sql_error_sql)
        ##print(sql_rst_1)
    else:
        print('查询无结果集')

collect_tables_info()

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